NFQCD10 Abstracts

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Nuclear Astrophysics

Exotic Hadrons

Hadrons in Nuclei

QCD phase diagram

		1st week (1/18-1/22)
		2nd week (1/25-1/29) / Mini-Symposium (Nuclear Astrophysics)(1/26)
		3rd week (2/01-2/05) / Mini-Symposium (Exotic Hadrons)(2/5)
		4th week (2/08-2/12)
		5th week (2/15-2/19) / Joint Mini-Symposium (Exotic Hadrons & Hadrons in Nuclei)(2/18)
		6th week (2/22-2/26) / Mini-Symposium (Hadrons in Nuclei)(2/23)
		7th week (3/01-3/05)
		8th week (3/08-3/12) / Mini-Symposium (QCD Phase Diagram)(3/10-11)
		9th week (3/15-3/19)
		Posetrs during seminar days (3/1-19)

1st week (Nuclear Astrophysics) (1/18-22)

• 1/18 (Mon) : Get together (16:30- @ Y206)
• J.M. Lattimer (1/19 (Tue) 10:30-11:15)
  --- Neutron Star Structure and the Equation of State
• T. Maruyama (1/19 (Tue) 11:30-12:15)
  --- Structured Mixed Phase of Nuclear Matter
• S. Reddy (1/20 (Wed) 10:30-12:00)
  --- Physics of neutron stars (L)
  I will review recent developments in the equation of state, transport properties and nuclear reactions in the neutron star crust and its implications for our understanding of accreting neutron stars and magnetars.

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  YITP Tea party (Saloon of Yukawa Hall) (1/20 (Wed) 15:00-15:30)

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• (M. Shibata) (1/20 (Wed) 15:30-16:30)
  --- (Numerical Relativity: Solving the issues in general relativity (YITP Colloquium, Panasonic Auditorium))
  I will talk about the latest results of general relativistic simulation for merger of binary neutron stars, focusing on the dependence of gravitational waveform and outcome of merger on the equations of state.
• N. Yasutake (1/21 (Thu) 10:30-11:15)
  --- Quark-hadron phase transition and the effects on the structures of compact stars
  We study the structures of compact stars with exotic matter. We take into account the finite size effects of quark-hadron mixed phase on the structures of magnetars. For hybrid stars, we find the characteristic distribution of magnetic field, which has a discontinuity originated in the quark-hadron mixed phase. These distributions of magnetic field will change astrophysical phenomena, such as cooling processes.
• R. Lastowiecki (1/21 (Thu) 11:30-12:15)
  --- Can hybrid stars with CFL quark cores form a third family of compact stars?
  The question of strange quark matter in compact stars (CS) is subject of intense studies, as the appearance of such a phase may lead to qualitative differences in CS phenomenology. In particular, it has been argued that viscous properties of strange matter would be significantly different than that of the two flavor matter. It was also shown that due to large pairing gaps of the color-flavor locking (CFL) phase the cooling would be suppressed leading to qualitatively different thermal evolution of compact star. In the present contribution we will investigate the possibility of the existence of a third family of hybrid stars containing stable CFL core. To this end, we will discuss two scenarios. First, we will analyze the impact of strong diquark coupling on the equation of state (EoS) and the CS mass-radius relationships. Second, we will investigate a chiral quark matter model with coupling strengths depending on the chemical potential.
• T. Tatsumi (1/22 (Fri) 10:30-11:15)
  --- Magnetic aspects of QCD and compact stars
  Several types of magnetic ordering in QCD and their implications on compact stars are discussed.
• H. Nakada (1/22 (Fri) 11:30-12:15)
  --- Mean-field approach to nuclei and nuclear matter

2nd week (Nuclear Astrophysics) (1/25-29)

• D. B. Blaschke (1/25 (Mon) 10:30-11:15)
  --- Color superconductivity and compact star phenomenology
  We give an overview over the variety of possible color superconducting quark matter phases, their properties and their role for the astrophysics of hybrid compact stars. By comparing with observations we strive to derive constraints on the structure of matter, its thermal and transport properties under extreme conditions of high densities, temperatures and strong fields.
• A. Li (1/25 (Mon) 11:30-11:25)
  --- Protoneutron stars in the Brueckner-Hartree-Fock approach and finite-temperature kaon condensation
  We study the properties of hot neutrino-trapped b -stable stellar matter using an equation of state of nuclear matter within the Brueckner-Hartree-Fock approach including three-body forces, combined with a standard chiral model for kaon condensation at finite temperature. The properties of (proto)neutron stars are then investigated within this framework.
• 1/26 (Tue) 09:30-17:50: Mini-Symposium (Nuclear Astrophysics) (see below)
• Ed. F. Brown (1/27 (Wed) 10:30-11:15)
  --- Nuclear reactions in neutron stars
• A. Bhattacharyya (1/27 (Wed) 11:30-12:15)
  --- Two step conversion of neutron star to strange star
  I want to discuss the conversion of a neutron star to strange star. The conversion takes place in two steps. In the first step, the nuclear matter gets converted to two flavour quark matter. The conversion of two flavour to three flavour strange matter takes place in the second step. The first process is dominated by the the motion of a hydrodynamic front whereas the second process non-leptonic weak interaction plays the main role. I also plan to discuss the effect of GR and rotation on the first process.
• J. Murphy (1/28 (Thu) 10:30-11:15)
  --- A Model for Gravitational Wave Emission from Core Collapse Supernova Explosions
• M.-K. Cheoun (1/28 (Thu) 11:30-12:15)
  --- Neutrino Induced Reaction Data for Nucleosynthesis by the QRPA
  We calculated neutrino induced reactions in the energy range below the Quasi-Elastic region for the astrophysically important nuclei. The neutrino reaction turns out to be important for the nucleosynthesis for the core collapsing supernovae because the neutrino flux expected to be emitted is large enough to excite the relevant nuclei in spite of the small cross section due to the weak interaction. Our calculation is carried out by the Quasi-particle Random Phase Approximation (QRPA), which has been successfully applied for the beta and double beta decay of relevant nuclei. To describe neutrino scattering, general multipole transitions by weak interactions with a finite momentum transfer are calculated for NC and CC reaction. Our results, which are compared with other theoretical calculations, are shown to reproduce well the experimental data available. Therefore our results could be valuable data for the neutrino induced reaction data before the future experimental data.
• G. Mathews (1/29 (Fri) 10:30-11:15)
  --- The physics of supernovae and proto-neutron stars
  The search for astrophysical evidence for a transition to QCD matter is an important goal. Although much effort has gone into searching for neutron star candidates, here we will describe the exploration of two other possible signatures. One is the search for strange dwarfs. Masses and radii for a large number of white dwarfs have been deduced from a combination of proper motion studies, Hipparcos parallax distances, effective temperatures, and binary or spectroscopic masses. Some stars appear to have radii which are significantly smaller than that expected for a standard electron-degenerate white-dwarf equations of state. We argue that there is marginal evidence for bimodality in the radius distribution. We show that the data exhibit several features consistent with the expected mass-radius relation of strange dwarfs. We identify eight nearby white dwarfs that are possible candidates for strange matter cores and suggest observational tests of this hypothesis. We also explore effects of a QCD phase transition on core collapse supernovae. We present results of prelimminary simulations and analyze possible observational effects.
• K. Nakazato (1/29 (Fri) 11:30-12:15)
  --- Exploring Hadron Physics in Black Hole Formations: a New Promising Target of Neutrino Astronomy
  Recently, we have performed several simulations on non-rotational core-collapses of a star with 40Msolar by a general relativistic neutrino-radiation-hydrodynamics code and computed quantitatively the dynamics up to the black hole formation as well as the neutrino luminosities and spectra. As a result, we have demonstrated by employing different hadronic equations of state (EOS) that the duration of neutrino emissions from this event is sensitive to the stiffness of EOS at supranuclear densities and, therefore, that the observation of neutrinos from such an event will provide us with valuable information on the properties of dense and hot hadronic matter as well as on the maximum mass of proto-neutron stars. However, this approach can not distinguish EOS's with a similar stiffness: a soft nucleonic EOS and a hyperonic EOS, for example. In this study, we attempt to break this degeneracy by analyzing more in detail the time variation of neutrino numbers observed at a terrestr ial detector. Performing the Kolmogolov-Smirnov test, which is free from the ambiguity of the distance to the progenitor, we show that the break-up of the degeneracy of hadronic EOS's is indeed feasible for Galactic events.
• A. Illarionov (1/29 (Fri) 16:00-16:45)
  --- Microscopic calculation of the low-temperature equation of state of dense matter and neutron star structure
  We present results for neutron star models constructed with a new equation of state for nuclear matter at low temperature. The ground state is computed using the Auxiliary Field Diffusion Monte Carlo (AFDMC) technique, with nucleons interacting via a semi-phenomenological Hamiltonian including a realistic two-body interaction. The effect of many-body forces is included by means of additional density-dependent terms in the Hamiltonian. We compare the properties of the resulting neutron-star models with those obtained using other nuclear Hamiltonians, focusing on the relations between mass and radius, and between the gravitational mass and the baryon number.

Mini-Symposium (Nuclear Astrophysics) (1/26 (Tue))

• A. Ohnishi (1/26 (Tue) 09:30-09:40)
  --- Opening Address
• C. Pethick (1/26 (Tue) 09:40-10:25)
  --- Review of neutron star matter
• R. E. Rutledge (1/26 (Tue) 10:25-11:10)
  --- X-ray Observations of Transient Neutron Stars in Quiescence
  Transient low mass X-ray binaries have placed useful constraints on nuclear processes in the crusts of neutron stars, and the cooling which takes place in their cores. I will describe how such systems are capable of telling us much about these nuclear processes, and review observations and the theoretical status of this class of neutron star systems. X-ray spectral observations of this class of neutron stars also offer the promise of strong constraints on the equation of state of dense nuclear matter, present in the cores of neutron stars. I will discuss this scenario, and describe how proposed X-ray observatories - such as the joint NASA/ESA/JAXA mission, "International X-ray Observatory" - can provide a measurement of the dense matter equation of state.

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  break (1/26 (Tue) 11:10-11:30)

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• M. Shibata (1/26 (Tue) 11:30-11:55)
  --- Merger of binary neutron stars
  I will talk about the latest results of general relativistic simulation for merger of binary neutron stars, focusing on the dependence of gravitational waveform and outcome of merger on the equations of state.
• G. Mathews (1/26 (Tue) 11:55-12:20)
  --- Astrophysical Consequences of QCD Matter in White Dwarfs and Supernova Collapse
  The search for astrophysical evidence for a transition to QCD matter is an important goal. Although much effort has gone into searching for neutron star candidates, here we will describe the exploration of two other possible signatures. One is the search for strange dwarfs. Masses and radii for a large number of white dwarfs have been deduced from a combination of proper motion studies, Hipparcos parallax distances, effective temperatures, and binary or spectroscopic masses. Some stars appear to have radii which are significantly smaller than that expected for a standard electron-degenerate white-dwarf equations of state. We argue that there is marginal evidence for bimodality in the radius distribution. We show that the data exhibit several features consistent with the expected mass-radius relation of strange dwarfs. We identify eight nearby white dwarfs that are possible candidates for strange matter cores and suggest observational tests of this hypothesis. We also explore effects of a QCD phase transition on core collapse supernovae. We present results of prelimminary simulations and analyze possible observational effects.
• I. Bombaci (1/26 (Tue) 12:20-12:45)
  --- Nucleation of Quark Matter in proto-Neutron Stars
  We study the nucleation process of quark matter in the core of neutron stars shortly after they are born (proto-neutron stars), when the entropy per baryon is of the order of 1 or 2 (k_Boltz) and neutrinos are trapped on dynamical timescales. We calculate and compare the nucleation rate and the nucleation time due to thermal and quantum nucleation mechanisms. We compute the crossover temperature above which thermal nucleation dominates the finite temperature quantum nucleation mechanism. We introduce the concept of limiting conversion temperature and critical mass M_cr for proto-hadronic stars, and we show that proto-hadronic stars with a mass M < M_cr could survive the early stages of their evolution without decaying to a quark star.

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  lunch (1/26 (Tue) 12:45-14:20)

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• S. Reddy (1/26 (Tue) 14:20-14:45)
  --- Neutrino emission and heat conduction in superfluid neutron star crust
  I will review recent developments in the equation of state, transport properties and nuclear reactions in the neutron star crust and its implications for our understanding of accreting neutron stars and magnetars.
• K. Oyamatsu (1/26 (Tue) 14:45-15:10)
  --- Phenomenological approach to nuclei and nuclear matter
• G. Watanabe (1/26 (Tue) 15:10-15:35)
  --- Formation of nuclear pasta in supernova
  Ordered structures in mesoscopic scale due to the competition between attractive and repulsive forces are ubiquitous in nature. In collapsing supernova cores, nuclear "pasta" phases such as triangular lattice of rod-like (i.e., spaghetti-like) nuclei and layered structure of slab-like (i.e., lasagna-like) nuclei are considered to exist due to the competition between the surface tension of nuclei resulting from the medium-range attractive nuclear force and the repulsive Coulomb force. Although 25 years have passed since the first prediction of the pasta phases [1, 2], it has been unclear whether or not they are actually formed in supernova cores. Using ab-initio numerical simulations called the Quantum Molecular Dynamics (QMD), we have solved this problem by demonstrating that a lattice of rod-like nuclei is formed from a bcc lattice by compression [3]. We have also discovered that, in the transition process, the system undergoes zigzag configuration of elongated nuclei, which are formed by a fusion of two original spherical nuclei. This is very different from a generally accepted scenario so far based on the fission instability of nuclei. References [1] D. G. Ravenhall, C. J. Pethick, and J. R. Wilson, Phys. Rev. Lett. 50, 2066 (1983). [2] M. Hashimoto, H. Seki, and M. Yamada,Prog. Theor. Phys. 71, 320 (1984). [3] GW, H. Sonoda, T. Maruyama, K. Sato, K. Yasuoka, and T. Ebisuzaki, Phys. Rev. Lett. 103, 121101 (2009).
• K. Nakazato (1/26 (Tue) 15:30-15:50)
  --- Gyroid phase in nuclear pasta

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  break (1/26 (Tue) 15:50-16:20)

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• H.-J. Schulze (1/26 (Tue) 16:20-16:45)
  --- BHF approach to neutron star structure
• M. Takano (1/26 (Tue) 16:45-17:10)
  --- Variational approach to nuclear matter
  The variational method is one of the most powerful many-body techniques for strongly correlated fermion systems, and has been employed to calculate the energy of nuclear matter. I will report our recent variational calculation for asymmetric nuclear matter at zero and finite temperatures. Based on this variational calculation, we are pursuing the construction of a nuclear equation of state for supernova simulations. I will also discuss our new variational method with an explicit energy functional for nuclear matter at zero temperature.
• A. Illarionov (1/26 (Tue) 17:10-17:25)
  --- Microscopic calculation of the low-temperature equation of state of dense matter and neutron star structure
  We present results for neutron star models constructed with a new equation of state for nuclear matter at low temperature. The ground state is computed using the Auxiliary Field Diffusion Monte Carlo (AFDMC) technique, with nucleons interacting via a semi-phenomenological Hamiltonian including a realistic two-body interaction. The effect of many-body forces is included by means of additional density-dependent terms in the Hamiltonian. We compare the properties of the resulting neutron-star models with those obtained using other nuclear Hamiltonians, focusing on the relations between mass and radius, and between the gravitational mass and the baryon number.
• G. Baym (1/26 (Tue) 17:25-17:55)
  --- Summary (Astro mini-symp.)

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  party (Saloon of Yukawa Hall) (1/26 (Tue) 18:05-)

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3rd week (Nuclear Astrophysics \& Exotic Hadrons) (2/1-5)

• M. Liebendoerfer (2/1 (Mon) 10:30-11:15)
  --- Multi-dimensional versus general relativistic neutrino radiation hydrodynamics in supernova simulations
• K. Kotake (2/1 (Mon) 11:30-12:15)
  --- Neutrino-driven explosion of massive stars
• Y. Suwa (2/1 (Mon) 14:00-14:45)
  --- Axisymmetric Simulation of Core-Collapse Supernovae
  Core-collapse supernovae are one of the most energetic explosions in the universe. The explosion mechanism is long lasting problem. For more than two decades, the neutrino-heating mechanism, relying on the energy deposition via neutrinos behind the stalled shock, has been supposed as the most promising scenario. However, the neutrino heating fails to produce explosion in spherical symmetric simulations. By performing axisymmetric hydrodynamic simulations of core-collapse supernovae with spectral neutrino transport, we support the assumption that the neutrino-heating mechanism aided by the standing accretion shock instability and convection can initiate an explosion of a 13 solar-mass star. In this seminar, our recent numerical results will be presented.
• Y. Sekiguchi (2/1 (Mon) 15:00-15:45)
  --- Formulation and application of general relativistic neutrino leakage scheme
  Performing fully general relativistic simulations taking account of microphysical processes (e.g. weak interactions, neutrino cooling) is one of long standing problems in numerical relativity. First, I discuss that main difficulty in implementation weak interactions and neutrinos in the general relativistic framework lies on the fact that the characteristic timescale of weak interactions $t_{\rm weak}$ is much shorter than the dynamical timescale $t_{\rm dyn}$ in hot dense matters. Numerically, this means that the system of hydrodynamic equations in general contains {\it stiff} source terms and it must be solved in the weak timescale if one adopt an explicit scheme. However, since $t_{\rm weak} \ll t_{\rm dyn}$ it is no more realistic to solve it explicitly. Therefore, an implicit scheme is necessary to solve it. However, to solve hydrodynamic equations implicitly is much more difficult and time-consuming in the general relativistic framework than in Newtonian framework. No working implicit formulations have been proposed. In this talk, instead of solving the equations implicitly, I propose a explicit method of solving them and present a self-consistent implementation of weak interactions and a formulation of so-called neutrino leakage scheme in fully general relativistic framework. Some applications of the general relativistic leakage scheme will be also presented.
• 2/1 (Mon) : Get together (16:30- @ Saloon of Yukawa Hall)
• S.H. Lee (2/2 (Tue) 09:30-11:00)
  --- Heavy multiquark systems from heavy ion collisions
  I will discuss recently observed heavy multiquark system, propose new stable configurations, and how these can be measured in heavy ion reactions.
• S. Yasui (2/2 (Tue) 11:30-13:00)
  --- Exotic nuclei with charm and bottom flavors
  We discuss the possibility of existence of exotic nuclei containing charm and bottom mesons. We study the interaction between $¥bar{D}$ ($B$) mesons and nucleons from view of heavy quark symmetry, and derive the boson exchange potentials. We apply these potentials to the two body system of $¥bar{D}$ ($B$) meson and nucleon $N$, and discuss the possible bound states of $¥bar{D}N$ ($BN$). We also qualitatively discuss the possible bound states of $¥bar{D}$ (B) meson and two nucleons.
• V. Dmitrasinovic (2/3 (Wed) 10:30-12:00)
  --- $D_{sJ}^{*}(2317)$, and $D_{J}^{*}(2308)$ as candidates for tetraquarks?
  The discovery of the even parity mesons $D_{s0}^{*+}(2317)$ and $D_{J}^{*}(2308\pm17\pm15\pm28)$ by Belle collaboration, some 160 MeV below their predicted masses as $c {\bar q}$ scalar meson in the usual potential quark models has raised questions about their structure. One interpretation is that they are ``tetraquark" ($c{\bar q}q {\bar q}$) states. We shall concern ourselves here only with tetraquark models with color degrees of freedom (d.o.f.), i.e. those that depend on the ``hidden color" $|{\bf {\bar 3}}_{12} {\bf 3}_{34} \rangle$ color-singlet state. The mass ordering of tetraquark flavour multiplets also depends crucially on the strong ``hyperfine" interaction (HFI). We use the 't Hooft HFI that fits the observed $\eta(550), \eta^{'}(960)$ and other light mesons spectra fairly well. To predict the tetraquark masses we classify these tetraquarks according to their (light) SU(3) flavor content, i.e. ${\bf 3} \otimes {\bf {\bar 3}} \otimes {\bf {\bar 3}} = {\bf 3} \otimes ({\bf 3} \otimes {\bf {\bar 6}}) = {\bf {\bar 3}_{\rm A}} \oplus {\bf {\bar 3}_{\rm S}} \oplus {\bf 6} \oplus {\bf \overline{15}}$. Note that there are two distinct flavour ${\bf \overline{3}}$-plets that can be distinguished by their permutational (anti)symmetry of the two quarks: ${\bf 3}_{\rm S, A}$. The two antisymmetric charmed tetraquark flavour multiplets (the ${\bf \overline{3}_{A}}$-plet and the ${\bf 6}$-plet) have the (curious) property that all of their members have the same mass, irrespective of the manifest strangeness. This property is in surprisingly good agreement with the measured masses of the $D_{s0}^{+}(2317)$ and $D_{0}(2308)$ mesons, but is subject to the condition that there is little, or no mixing with analogous states from other multiplets. Flavour SU(3) symmetry breaking leads to mass splittings and together with the HFI determines the mixing of flavor multiplets. We discuss the mixing of various $D_{}$ and $D_{s}$ states as well as the predictions of the 't Hooft HF interaction, which leads to the ${\bf \overline{3}_{A}}$-plet as the lowest lying tetraquark state; moreover it predicts little mixing with the ${\bf 6}$ -plet, due to the large mass difference, which fact makes the $D_{sJ}^{*+}(2317)$ - $D_{J}^{*}(2308)$ pair serious candidates for nonexotic tetraquarks.
• J. Schaffner-Bielich (2/3 (Wed) 14:00-14:45)
  --- Can a supernova bang twice?
• Y. Koma (2/4 (Thu) 10:30-12:00)
  --- Heavy quark potentials in lattice QCD
  Heavy quarknia, bound states of a heavy quark and antiquark, offer a unique opportunity to gain an understanding of nonperturbative QCD. A possible way of studying such systems systematically in QCD is to employ (potential) nonrelativistic QCD, which provides the static inter-quark potential as the leading order contribution, followed by relativistic corrections in powers of 1/m with quark mass m. The various properties of heavy quarkonium can then be extracted by solving the Schroedinger equation. We present our numerical results of the heavy quark potentials obtained by using lattice QCD Monte Carlo simulations, which include the correction at O(1/m) as well as the spin-dependent and velocity-dependent corrections at O(1/m^2).
• 2/5 (Fri) 09:30-18:20: Mini-Symposium (Exotic Hadrons) (see below)

Mini-Symposium (Exotic Hadrons) (2/5 (Fri))

• K.F. Liu (2/5 (Fri) 09:40-10:25)
  --- Precision charmed meson spectroscopy and decay constants from chiral fermions
• T. Iijima (2/5 (Fri) 10:25-11:10)
  --- Study on Exotic Hadrons at B factories
  The high luminosity e+e- collision at the B factory experiments (Belle/BaBar) have revealed rich spectra of hadron resonances in the charmonium region. Many of the newly found states do not fit to the unfilled level of the conventional c c-bar spectrum. Some of them are thought to be exotic states, having sub-strucuture more complex than the quark anti-quark mesons. In fact, Belle has found some states with non-zero electric charge, that require a minimum quark content of c c-bar u d-bar or c c-bar u-bar d. In this talk, we review the present status of studies on such exotic hadrons at the B factory experiments.

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  break (2/5 (Fri) 11:10-11:25)

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• K. Terasaki (2/5 (Fri) 11:25-12:00)
  --- Tetra-quark systems in heavy mesons
  To save time, I would like to talk about D_{s0}^+(2317) and X(3872) as candidates of tetra-quark mesons, from the view point of their decays and productions. If I have enough time, I would like to talk why neutral and doubly charged partners of D_{s0}^+(2317) as the tetra-quark meson have never been observed and how to search for them. In addition, the conventional open-charm scalars are studied as releted topics.
• T. Matsuki (2/5 (Fri) 12:00-12:35)
  --- Decay properties of heavy-light mesons
  I describe how the heavy-light mesons decay into one pion + another heavy-light meson and/or radiative decay. The formulation I propose is different from the one used by Di Pierro and Eichten. I discover that there is a sum rule between different decay channels of the heavy-light mesons in the heavy quark limit, i.e., \Gamma(J^+\to 0^- + \gamma)+\Gamma(J^+\to 0^- + \gamma) is equal to each other for J=0, 1, and 2.

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  lunch (2/5 (Fri) 12:35-14:00)

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• Beijiang Liu (2/5 (Fri) 14:00-14:45)
  --- Recent BES results on hadron spectroscopy
  (It will be reported about X(1860), X(1835), and etc.) The abstraction will be submitted latter via E-mail.
• M. Takizawa (2/5 (Fri) 14:45-15:20)
  --- Heavy mesons and hadron scattering
• T. Maeda (2/5 (Fri) 15:20-15:45)
  --- Strong decays of csbar mesons in the covariant oscillator quark model with the U~(12) x O(3,1) symmetry
  We systematically investigate the strong decays of csbar mesons by applying the covariant oscillator quark model(COQM) based on the U~(12) x O(3,1) symmetry. The result allows us to make a possible level assignments for a series of recently observed charmed strange mesons.

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  break (2/5 (Fri) 15:45-16:00)

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• T.T. Takahashi (2/5 (Fri) 16:00-16:45)
  --- $\Lambda(1405)$ in lattice QCD
• T. Iwata (2/5 (Fri) 16:45-17:20)
  --- Hadron spectroscopy at COMPASS
• Kiyoshi Sasaki (2/5 (Fri) 17:20-17:55)
  --- S-wave $\pi$-K scattering length from lattice QCD
  The $S$-wave $\pi K$ scattering lengths are calculated for both the isospin 1/2 and 3/2 channels in the lattice QCD by using the finite size formula. We perform the calculation with $N_f=2+1$ gauge configurations generated on $32^3 \times 64$ lattice using the Iwasaki gauge action and nonperturbatively $O(a)$-improved Wilson action at $1/a = 2.17$ GeV. The quark masses correspond to $m_\pi = 0.30 - 0.70$ GeV. For $I=1/2$, to separate the contamination from excited states, we construct a $2 \times 2$ matrix of the time correlation function and diagonalize it. Here, we adopt the two kinds of operators, $\bar{s}u$ and $\pi K$. It is found that the signs of the scattering lengths are in agreement with experiment, namely attraction in $I=1/2$ and repulsion in $I=3/2$. We investigate the quark-mass dependence of the scattering lengths and also discuss the limitation of chiral perturbation theory.
• P. Gubler (2/5 (Fri) 17:55-18:20)
  --- Possible quantum numbers of the pentaquark $\Theta^+(1540)$ in QCD sum rules
  Pentaquark states with strangeness $S = +1$ and $IJ^{\pi} = 0\frac{1}{2}^{\pm},1\frac{1}{2}^{\pm},0\frac{3}{2}^{\pm},1\frac{3}{2}^{\pm}$ are investigated using the QCD sum rule technique. Throughout the calculation, we emphasize the importance of the establishment of a valid Borel window, which corresponds to a region of the Borel mass, where the operator product expansion (OPE) converges and the presumed ground state pole dominates the sum rules. We obtain such a Borel window by constructing the sum rules from the differenece of two carefully chosen independent correlators and by calculating the OPE up to dimension 14. As a result, we conclude that the state with qauntum numbers $0\frac{3}{2}^{+}$ state appears to be the most probable candidate for the experimantally observed $\Theta^{+}(1540)$, while we also obtain states with $0\frac{1}{2}^{-},1\frac{1}{2}^{-},1\frac{3}{2}^{+}$ at slightly higher mass regions. We furthermore discuss the contribution of the $KN$ scattering states to the sum rules, and the possible influence of these states on our results.

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  party (Saloon of Yukawa Hall) (2/5 (Fri) 18:30-)

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4th week (Exotic Hadrons) (2/8-12)

• D. Diakonov (2/8 (Mon) 09:30-12:30)
  --- Ordinary and exotic baryons, strange and charmed, in the relativistic mean field approach (L)
  We develop a view on baryons similar to that on nuclei at large A: the role of A is played, in baryons, by the number of colors Nc. If Nc is considered large, baryons and their excitations can be considered in a mean-field approach, just like large-A nuclei. We argue that the mean field in baryons breaks spontaneously the spherical and SU(3) flavor symmetries, but retains the SU(2) symmetry of simultaneous rotations in space and isospace. The mean field and consequently the ground state and excitations for the u,d quarks in baryons on the one hand and s quarks on the other are totally different, again in analogy with heavy nuclei where the mean field for protons is different from that for neutrons. The one-quark and quark-hole excitations in the mean field, together with the SU(3) rotational bands about them determine the spectrum of baryon resonances, which turns out to be in good accordance with reality, despite Nc being only three in the real world. A by-product of this scheme is a confirmation of the light pentaquark Theta+ baryon uudd-sbar as a typical Gamov--Teller resonance long known in nuclear physics. An extension of the same large-Nc logic to charmed baryons leads to a new prediction of a decapenta (15)-plet of charmed pentaquarks, two of which, Theta_c^{++}=cuud-sbar and Theta_c^{+}=cudd-sbar, may be light and stable with respect to strong decays.
• K. Hashimoto (2/9 (Tue) 09:30-11:00)
  --- Hadron spectra and quark mass dependence in Holographic QCD
  We describe hadron spectroscopy in holographic QCD. In particular, we introduce quark masses for Saka-Sugimoto model of massless QCD. This provides a non-perturbative computations of meson/baryon mass shifts due to the quark masses, from the chiral limit.
• O. Scholten (2/9 (Tue) 11:30-13:00)
  --- Coupled channels calculations for photo-induced strangeness production.
• S. Takeuchi (2/10 (Wed) 09:30-11:00)
  --- Multiquark hadrons in quark model*
• K. Sudoh (2/10 (Wed) 11:30-13:00)
  --- Charmed/Bottomed Meson Mass Spectra in 1/mQ expansion
  Charmed and bottomed meson mass spectra are studied in semi-relativistic potential model. Here the wave function and energy are systematically expanded in order of 1/mQ. We show that our results can explain all data with high accuracy.
• 2/11 (Thu) : Holiday
• J.R. Pelaez (2/12 (Fri) 09:30-12:30)
  --- Properties of resonances from unitarized Chiral perturbation theory: Nc behavior and quark mass (L)
  We review Chiral Perturbation Theory and how the use of dispersion relations lead to its unitarization and the generation of resonances. We also review how unitarized Chiral Perturbation Theory can help establishing the existence and nature of resonances, through their link with QCD via their Nc behavior and their dependence on quark masses.

5th week (Exotic Hadrons / Hadrons in Nuclei) (2/15-19)

• M. Oka (2/15 (Mon) 10:30-12:00)
  --- Multiquark hadrons in QCD
• B.S. Zou (2/16 (Tue) 11:00-12:30)
  --- Multi-quark components in hadrons
• T. Sato (2/17 (Wed) 09:30-11:00)
  --- Properties of nucleon resonances from dynamical model of meson production reactions
• T. Hatsuda (2/17 (Wed) 11:30-13:00)
  --- Nuclear Force from Lattice QCD
• 2/18 (Thu) 09:30-18:15: Mini-Symposium (Exotic \& Hadrons) (see below)
• E. Oset (2/19 (Fri) 09:30-12:30)
  --- Dynamically generated resonances (L)
  I shall report on recent developments on the dynamical generation of mesonic and baryonic resonances from the interaction of mesons or mesons and baryons, involving pseudoscalar and vector mesons. Systems of two and three body hadrons will be discussed as well as the problem of medium modification of hadrons.

Joint Mini-Symposium (Exotic Hadrons \& Hadrons in Nuclei) (2/18 (Thu))

• H.-Ch. Kim (2/18 (Thu) 10:15-10:40)
  --- Recent results for the baryon antidecuplet within the chiral quark-soliton model
• Y. Ikeda (2/18 (Thu) 10:40-11:05)
  --- K-N potential and $\Theta^+$ in lattice QCD
  We study the kaon-nucleon potentials from full lattice QCD simulation. By adopting the KN-type interpolating fields, we extract the kaon-nucleon potentials through the Bethe-Salpeter amplitudes following the method to extract the nuclear force developed by Aoki, Hatsuda and Ishii. In this presentation, I will report our numerical results of kaon-nucleon potential from lattice QCD, and also discuss the structure of the kaon-nucleon resonances in the Theta+ channel.

  ---

  break (2/18 (Thu) 11:05-11:20)

  ---

• J. Mares (2/18 (Thu) 11:20-11:55)
  --- RMF description of hyperons in the nuclear medium
  Many-body systems with non-zero strangeness are studied within the relativistic mean field (RMF) approach. Present discussion ranges from ordinary hypernuclei to multiply strange objects. We demonstrate that the RMF approach provides a natural and consistent description of both nuclear and hypernuclear systems. With reasonable values of the scalar, vector and tensor couplings it is possible to reproduce experimental hypernuclear data, such as single particle energies, spin-orbit splittings. Calculations of Sigma atoms not only reveal that the RMF model is capable of high quality fits to the data but also demonstrate that the data are sufficient to constrain the Sigma hyperon couplings. This has important consequences for the spectroscopy of Sigma hypernuclei.
• K. Moriya (2/18 (Thu) 11:55-12:20)
  --- Results on Photoproduction of the $\Lambda(1405)$ Using CLAS
  The nature and properties of the Lambda(1405) have remained a mystery for decades. Its Sigma pi invariant mass distribution, or lineshape, which has been seen to be distorted from a Breit-Wigner form, has suggested that there are strong dynamical components in the Lambda(1405), but so far experimental studies have been inconclusive on the nature of this lineshape distortion. Using the CLAS detector at Jefferson Lab, we have done a photoproduction measurement of the Lambda(1405) using a real photon beam on a proton target. Due to the high statistics and good resolution of our experiment, we have been able to extract the lineshape of the Lambda(1405) in all three Sigma pi decay modes over a wide range of energy and angles. An overview of the experiment and data analysis, as well as a discussion of the lineshapes will be given.
• T. Hyodo (2/18 (Thu) 12:20-12:40)
  --- $\Lambda^*$-N bound state based on chiral dynamics
• M. Berger (2/18 (Thu) 12:40-12:55)
  --- Search for the ppK$^-$ Kaonic Bound State in pp-Reactions at 3.1 GeV with FOPI

  ---

  lunch (2/18 (Thu) 12:55-14:20)

  ---

• S. Kumano (2/18 (Thu) 14:20-14:55)
  --- Determination of fragmentation functions
  Fragmentation functions and their uncertainties are determined for pion, kaon, and proton by a global analysis of charged-hadron production data in electron-positron annihilation. The results indicate that the fragmentation functions, especially gluon and light-quark fragmentation functions, have large uncertainties. There are large differences between widely-used functions by KKP (Kniehl, Kramer, and Potter) and Kretzer; however, they are compatible with each other and also with our functions if the uncertainties are taken into account. Next, we propose that the fragmentation functions should be used to identify exotic hadrons. As an example, fragmentation functions of the scalar meson f0(980) are investigated. It is pointed out that the second moments and functional forms of the u- and s-quark fragmentation functions can distinguish the tetraquark structure from qqbar. By the global analysis of f0 (980) production data in electron-positron annihilation, its fragmentation functions and their uncertainties are determined. It is found that the current available data are not sufficient to determine its internal structure, while precise data in future should be able to identify exotic quark configurations.
• Q. Zhao (2/18 (Thu) 14:55-15:20)
  --- Quark model approach for meson photoproduction and meson-nucleon scatterings
• H. Nagahiro (2/18 (Thu) 15:20-15:45)
  --- Radiative decays of the axial-vector mesons as dynamically generated resonances
  We study the radiative decays of the axial-vector mesons as dynamically generated resonances by pseudo-scalar and vector meson scattering. We would like to discuss the possible nature of the axial-vector mesons through the radiative decay studies.
• S. Schadmand (2/18 (Thu) 15:45-16:10)
  --- Hadron-Hadron Interactions and Hadron Spectroscopy with WASA at COSY

  ---

  break (2/18 (Thu) 16:10-16:25)

  ---

• D. Jido (2/18 (Thu) 16:25-17:00)
  --- Partial restoration of chiral symmetry in nuclei
• S. Hirenzaki (2/18 (Thu) 17:00-17:25)
  --- Formation of meson nucleus systems
• S. Yokkaichi (2/18 (Thu) 17:25-17:50)
  --- Vector meson in nuclear medium, experiments at KEK and JPARC
• U. Yakhshiev (2/18 (Thu) 17:50-18:15)
  --- Nucleon properties in nuclear matter
  We discuss the single nucleon properties in nuclear matter within the modified Skyrme model. The medium influence to the nucleon properties is taken into account via the optical potential of pion fields in nuclear matter. The parameters of the optical potential are taken from the analysis of the pion-nucleus scattering phenomenology. We discuss the nucleon properties in finite nuclei. In particular we discuss the well known phenomena, the Nolen-Schiffer anomaly, which takes place in mirror nuclei.

  ---

  party (Saloon of Yukawa Hall) (2/18 (Thu) 18:10-)

  ---

6th week (Hadrons in Nuclei) (2/22-26)

• U. Mosel (2/22 (Mon) 09:30)
  --- Hadrons in Strongly Interacting Matter (L)
• S. Schadmand (2/22 (Mon) 13:00-)
  --- Mesons in Nuclei

  ---

  Tea time (2/22 (Mon) 15:00-15:30)

  ---

• H. Yamazaki (2/22 (Mon) 15:30-)
  --- Meson photoproduciton at ELPH (LNS), Tohoku
• 2/23 (Tue) 09:30-18:15: Mini-Symposium (Hadrons in Nuclei) (see below)
• T. Rijken (2/24 (Wed) 09:30-)
  --- Kadyshevsky Field Theory, Pion-nucleon and Nucleon-nucleon (L)
• Y. Akaishi (2/24 (Wed) 13:30-)
  --- Hypernuclei

  ---

  YITP Tea party (Saloon of Yukawa Hall) (2/24 (Wed) 15:00-15:30)

  ---

• A. Gal (2/25 (Thu) 09:30-)
  --- Strange nuclear physics (L)
• R. Hayano (2/25 (Thu) 13:30-)
  --- Hadrons in Nuclear Medium, experimental studies
• A. Dote (2/26 (Fri) 09:30-)
  --- Kaonic nuclei
  I'll give two talks in a symposium (Feb. 23) and in a seminar (Feb. 26). Both talks are related to kaonic nuclei, especially their structure. But I'm sorry that at the moment I've not deterimed the contents of my talks.
• K. Suzuki (2/26 (Fri) 11:30-)
  --- Experimental search for the kaonic nuclear state, K-pp, using 3.1 GeV proton induced reaction
• T. Harada (2/26 (Fri) 14:00-)
  --- Hypernuclear formation

Joint symposium of Theory and Experiment (Hadrons in Nuclei) (2/23 (Tue))

• W. Weise (2/23 (Tue) 09:30-10:20)
  --- Keynote talk
  (to be supplied later)

  ---

  break (2/23 (Tue) 10:20-10:40)

  ---

• H. Nagahiro (2/23 (Tue) 10:40-11:15)
  --- Mesons at finite density
  We study the radiative decays of the axial-vector mesons as dynamically generated resonances by pseudo-scalar and vector meson scattering. We would like to discuss the possible nature of the axial-vector mesons through the radiative decay studies.
• K. Ozawa (2/23 (Tue) 11:15-11:45)
  --- omega meson in nucleus, experimental study
  New experimet at J-PARC is proposed for a study of omega meson bound state and mass spectrum in nucleus. I will report its physics, epxeriment and current status.
• K. Itahashi (2/23 (Tue) 11:45-12:10)
  --- Pionic atoms at RIBF and eta-mesic nucleus at JPARC
  being prepared...
• H. Ohnishi (2/23 (Tue) 12:10-12:35)
  --- Study of in-medium mass modification for the $\phi$ meson using $\phi$ meson bound state in nucleus
  We propose to study in-medium mass modification of the $\phi$ meson via the formation of $\phi$ meson bound state. We demonstrate that a completely background-free missing-mass spectrum can be obtained efficiently by $(\overline{p}, \phi)$ spectroscopy together with the $K^+\Lambda$ tagging, using the primary reaction channel $\overline{p} p \rightarrow \phi \phi$. From both missing mass and invariant mass study of the sub-threshold energy region, one can independently deduce the mass shift information. A systematic study over several nuclear targets will yield a unique, definitive and precise determination of the in-medium mass modification of the vector meson $\phi(s\overline{s})$.

  ---

  lunch (2/23 (Tue) 12:35-14:00)

  ---

• H. Toki (2/23 (Tue) 14:00-14:40)
  --- Pions in nuclei and tensor force
• L. Tolos (2/23 (Tue) 14:40-15:10)
  --- Heavy meson in nuclear medium
  The properties of strange mesons (K and $\bar K$ and $\bar K^*$) in nuclear matter at finite temperature are studied using a unitary approach in coupled channels. The kaon-nucleon interaction incorporates s- and p-wave contributions within a chiral model while the interaction of $\bar K^*$ with nucleons is obtained in the framework of the local hidden gauge formalism. The in-medium solution accounts for Pauli blocking effects, mean-field binding on baryons, and meson self-energies. We calculate $K$, $\bar K$ and $\bar K^*$ (off-shell) spectral functions and single particle properties. We also analyze the energy weighted sum rules of the kaon propagator as a quality test of model calculations. We finally discuss the implications for the decay of the $\phi$ meson in this hot and dense medium.

  ---

  break (2/23 (Tue) 15:10-15:30)

  ---

• M. Iio (2/23 (Tue) 15:30-16:15)
  --- Kaonic atoms and kaonic nuclei, experiments
• A. Dote (2/23 (Tue) 16:15-16:40)
  --- Kaonic nucleus, structure
  I'll give two talks in a symposium (Feb. 23) and in a seminar (Feb. 26). Both talks are related to kaonic nuclei, especially their structure. But I'm sorry that at the moment I've not deterimed the contents of my talks.
• T. Koike (2/23 (Tue) 16:40-17:05)
  --- Kaonic nucleus, formation
• T. Yamazaki (2/23 (Tue) 17:05-17:35)
  --- Experimental information on $K^-p$ and $K^-pp$

  ---

  party (Saloon of Yukawa Hall) (2/23 (Tue) 18:00-)

  ---

7th week (Hadrons in Nuclei \& QCD phase diagram) (3/1-5)

• L. Tolos (3/1 (Mon) 09:30-)
  --- Meson Production at high density and temperature
  The properties of strange mesons (K and $\bar K$ and $\bar K^*$) in nuclear matter at finite temperature are studied using a unitary approach in coupled channels. The kaon-nucleon interaction incorporates s- and p-wave contributions within a chiral model while the interaction of $\bar K^*$ with nucleons is obtained in the framework of the local hidden gauge formalism. The in-medium solution accounts for Pauli blocking effects, mean-field binding on baryons, and meson self-energies. We calculate $K$, $\bar K$ and $\bar K^*$ (off-shell) spectral functions and single particle properties. We also analyze the energy weighted sum rules of the kaon propagator as a quality test of model calculations. We finally discuss the implications for the decay of the $\phi$ meson in this hot and dense medium.
• J. Mares (3/1 (Mon) 11:30-)
  --- Multikaonic (hyper)nuclei
  Recent self-consistent calculations of multi-Kbar (hyper)nuclear states are reviewed. We study the interplay between the underlying dynamical processes and the relevant kinematical conditions that determine the decay widths of Kbar-nuclear states. We discuss in detail a robust saturation pattern of the Kbar separation energy B_Kbar and densities on increasing the number of antikaons embedded in the (hyper)nuclear system. We conclude that Kbar condensation is unlikely to occur in strong-interacting self-bound strange hadronic configurations.
• W. Weise (3/2 (Tue) 09:30-)
  --- Chiral Symmetry at Finite Density and Temperature (L)
  (to be supplied later)
• T. Muto (3/2 (Tue) PM)
  --- High-density multi-antikaonic system
  In a series of our studies of high-density multi-strangeness system, the structure of multi-antikaonic nuclei (MKN), where several $K^-$ mesons are bound in the nucleus, is investigated. We base our study on a relativistic mean-field theory (RMF),coupled with the nonlinear effective chiral Lagrangian which includes $¥bar K$-nucleon ($N$) and $¥bar K-¥bar K$ interactions. We also discuss the role of hyperon-mixing in the MKN on the formation of deeply bound self-bound objects. A relation between the MKN and kaon condensation in compact stars is mentioned.
• K.Kashiwa (3/2 (Tue) PM)
  --- Importance of imaginary chemical potential for QCD phase diagram in the PNJL model
  Thermodynamical quantities at imaginary chemical potential are related to those at the real chemical potential through the Fourier transformation and analytic continuation. However, in this approach, it is difficult to obtain the results in the high real chemical potential regions, because of the limit of computer powers and the convergence of extrapolations. Therefore, we propose the utilization of the Polyakov-loop extended Nambu-Jona-Lasinio model to the extrapolation procedures.
• T. Hell (3/2 (Tue) PM)
  --- Thermodynamics of a nonlocal PNJL model
  Our work is focused on the description of the phase diagram of strongly interacting matter using a nonlocal Polyakov loop extended Nambu--Jona-Lasinio (PNJL) model with 2+1 quark flavors. The main advantage of such an approach with respect to its local version is that it does not suffer from pathologies caused by the artificial momentum cutoff of the local NJL model. In the zero temperature limit meson properties and the momentum dependence of the dynamically generated constituent quark mass are reproduced. The thermodynamics involves the coupling to the Polyakov loop as order parameter of the confinement/deconfinement transition. Both finite temperature and non-zero quark chemical potential regions of the QCD phase diagram are investigated using this PNJL approach. Thermodynamic quantities such as the pressure and susceptiblities are studied. The sensitivity of the existence and location of the critical point with respect to parameter variations are explored.
• 3/2 (Tue) : Get together (17:00- @ Saloon of Yukawa Hall)
• S.J. Sin (3/3 (Wed) 10:00-11:00)
  --- Holographic Hadron in dense medium
  We study a sector of the hadron spectrum in the presence of finite baryon density. We use a non-supersymmetric gravity dual to a confining guage theory which exhibits a running dilaton. The interaction of mesons with the finite density medium is encoded in the dual theory by a force balancing between flavor D7-branes and a baryon vertex provided by a wrapped D5-brane. When the current quark mass m_q is sufficiently large, the meson mass reduces, exhibiting an interesting spectral flow as we increase the baryon density while it has a more complicated behaviour for very small m_q.
• K. Nawa (3/3 (Wed) 11:20-12:20)
  --- Baryons and baryonic matter from Skyrmions in holographic QCD
  We study baryons and baryonic matter in holographic QCD with D4/D8/D8-bar multi-D brane system in type IIA superstring theory. We introduce the chiral soliton (Skyrmion) picture to discuss baryons in holographic QCD. We also analyze the baryonic matter in holographic QCD by placing the single Skyrmion on a three-dimensional closed manifold S^3. Several features of dense QCD like chiral symmetry restoration and deconfinement are discussed in this framework. We also propose new pictures for the baryonic matter as 'pion dominance' and 'swelling of baryons', which correspond to a precursory phenomena of deconfinement in dense baryonic matter.
• P.-M. Zhang (3/4 (Thu) 10:00-11:00)
  --- $SU(2)$ QCD and Multi-component Dual Ginzburg-Landau Theory
  By virtue of decomposition of $SU(2)$ gauge potential, we investigate the two-component Dual Ginzburg-Landau theory. With the large flux limit, the wall vortices are obtained, which could be related with the Bag model.
• K. Kondo (3/4 (Thu) 11:20-12:20)
  --- Toward a first-principle derivation of confinment and chiral-symmetry crossover transition in QCD
  We propose a framework which enables us to understand the confinement/deconfinemen and chiral-symmetry breaking/restoration crossover transition from the first principle of QCD. In fact, we derive modified versions of the (nonlocal) Polyakov-loop extended Nambu-Jona-Lasinio (PNJL) model. The phase diagram of QCD will be discussed based on the exact renormalization group.
• O. Andreev (3/5 (Fri) 10:00-11:00)
  --- Quadratic Corrections and Gauge/String Duality
  I will discuss the quadratic corrections in the pressure as in the Fuzzy bag model.
• S. Nakamura (3/5 (Fri) 11:20-12:20)
  --- Gravity Dual of Spatially Modulated Phase
  Some gravity duals of strongly interacting gauge theories have Chern-Simons terms which correspond to the chiral current anomalies. At finite densities, some Chern-Simons term induces a non-standard dispersion relation which has Van Hove singularity. Furthermore, if we can take the finite-density effect large enough, the non-standard dispersion relation can be tachyonic, causing a phase transition into a spatially modulated phase where translational and rotational symmetries are spontaneously broken. We analyze some top-down holographic models and discuss a possibility of such a phenomena from the viewpoint of large-Nc QCD.

8th week (QCD phase diagram) (3/8-12)

• O. Philipsen (3/8 (Mon) 10:00-11:00)
  --- Finite density QCD from strong coupling expansions
• Seyong Kim (3/8 (Mon) 11:20-12:20)
  --- Finite Temperature/Density Phase Diagram of Two-Color QCD
• 3/9 (Tue) : Intensive Seminar Day
• C. Sasaki (3/9 (Tue) 11:00-11:45)
  --- The Phase Structure of Dense QCD from Chiral Models
  Hadron properties and possible phases of dense QCD are discussed in chiral approaches: The interplay between chiral symmetry breaking and "confinement" together with the $N_c$ dependence of the phase structure can be dealt with in a PNJL model. The presence of dense matter may allow a different symmetry breaking pattern from that in vacuum. It is shown that an intermediate phase where chiral symmetry is spontaneously broken is characterized by non-vanishing tetra-quark condensate. The quark number susceptibility exhibits a strong enhancement on the boundary line which separates ordinary chiral broken from this intermediate phases, rather than that of the chiral symmetry restoration. This can be interpreted as the quarkyonic transition which was recently proposed in large $N_c$ QCD. I will discuss the results along with the field theoretical requirements and possible emergence of symmetries in dense matter as well as phenomenology in these phases.
• K. Itakura (3/9 (Tue) 12:00-12:45)
  --- Non-Abelian vortices in the CFL phase (tentative)
  I will discuss the fermionic internal structure of non-Abelian vortices in the CFL phase. It is a standard technique to solve the "Bogoliubov de Genne (B-dG) equation" for the fermions giving inhomogeneous superconducting gaps. We show that, by solving the B-dG equation for the non-Abelian vortex in the CFL phase, there exist massless fermions trapped in a vortex.
• K. Morita (3/9 (Tue) 14:00-14:45)
  --- J/$\psi$ and $\chi_c$ in hot and dense hadronic matter from QCD sum rules
  We study J/psi and chi_c in hot and dense hadronic matter near phase boundary using QCD sum rules. In QCD sum rules for heavy quarkonia, leading in-medium effects can be accounted for temperature dependence gluon condensates. We calculate the scalar and the twist-2 gluon condensates as functions of temperature and chemical potential by making use of a resonance gas model. Then we investigate the mass shift of J/psi and chi_c within parameter ranges consistent with the equation of state from lattice QCD. We found that the downward mass shift becomes stronger at finite chemical potential, which could be reflected in the particle ratio via statistical hadronization mechanism.
• K. Schwenzer (3/9 (Tue) 15:00-15:45)
  --- Large amplitude behavior of the bulk viscosity of dense matter
  The bulk viscosity of dense matter describes the response to an external compression and generally depends non-linearly on the amplitude of the perturbation. These supra-thermal effects (delta mu > T) are usually omitted, although they can enhance the viscosity by orders of magnitude at realistic amplitudes. We extend previous results for strange quark matter and show that these effects are even more important for hadronic matter. Our results should be particularly applicable to unstable oscillation modes of compact stars and their observed spin down behavior.
• Y. Hidaka (3/9 (Tue) 16:00-16:45)
  --- Diagrammatic Method for Computing Transport Coefficients in Quantum Field Theory
  We propose a novel diagrammatic method for computing transport coefficients in relativistic quantum field theory. Our method is based on a reformulation and extension of the diagrammatic method by Eliashberg given in the imaginary-time formalism to the relativistic quantum field theory in the real-time formalism, in which the cumbersome analytical continuation problem can be avoided. The transport coefficients are obtained from a two-point function via Kubo formula. It is know that naive perturbation theory breaks down owing to a so called pinch singularity, and hence a resummation is required for getting a finite and sensible result. As a novel resummation method, we first decompose the two point function into the singular part and the regular part, and then reconstruct the diagrams. We find that a self-consistent equation for the two-point function has the same structure as the linearized Boltzmann equation. It is known that the two-point function at the leading order is equivalent to the linearized Boltzmann equation. We find the higher order corrections are nicely summarized as a renormalization of the vertex function, spectral function, and collision term.
• 3/10-11 : Mini-Symposium (QCD phase diagram) (see below)
• M. G. Alford (3/11 (Thu) 15:30-16:30)
  --- Transport properties of quark matter
• R. A. Janik (3/12 (Fri) 10:00-11:00)
  --- AdS/CFT applied to quark-gluon-plasma
• P. Hohler (3/12 (Fri) 11:20-12:20)
  --- Towards the Gravity Dual of Quarkonium in the Strongly Coupled QCD Plasma
• 3/13 (Sat) : (Hiroshima Symposium)

Mini-Symposium (QCD Phase Diagram) (3/10-11)

• 3/10 (Wed) : 1st day of the symposium
• T. Hatsuda (3/10 (Wed) 09:05-09:40)
  --- Phase diagram (*)
• K. Shigaki (3/10 (Wed) 09:40-10:15)
  --- Expeditions beyond QCD Phase Boundary at LHC and RHIC
  K.Shigaki for the ALICE Collaboration

  The production of a deconfined partonic phase has been basically proven at the BNL-RHIC. At the LHC, it will be necessary to provide a unified and quantitative understanding of the properties of the multi-parton system governed by the strong interaction. Studies of thermal radiation and heavy flavors will be essential in this context.

  The ALICE experiment started in 2009 with the goal of exploring the properties of the partonic phase at the high temperatures that can be reached at the LHC. Hiroshima, CNS Tokyo and Tsukuba are in the international collaboration. Physics prospects and a clue of first physics results at ALICE will be reported, with an emphasis on photon measurements with its high performance PHOS detector.

  ---

  break (3/10 (Wed) 10:15-10:40)

  ---

• M. Stephanov (3/10 (Wed) 10:40-11:10)
  --- Fluctuations and QCD Critical Point
• S. Gupta (3/10 (Wed) 11:10-11:40)
  --- QCD critical point
• T. Kunihiro (3/10 (Wed) 11:40-12:10)
  --- QCD Critical Points and Associated Soft Modes
  We investigate the combined effect of the repulsive vector interaction and the positive electric chemical potential on the chiral phase transition by considering neutral color superconductivity (CSC). The chiral condensate, diquark condensate and quark number densities are solved in both two-flavor and two-plus-one-flavor Nambu-Jona-Lasinio(NJL) models with the so called Kobayashi-Maskawa-'t Hooft term under the charge neutrality constraint. We demonstrate that multiple chiral critical-point structures always exist in the NJL model within the self-consistent mean-field approximation and the number of chiral critical points can vary from zero to four, which is dependent on the magnitudes of vector interaction and the diquark coupling. The difference between the dynamical chemical potentials induced by vector interaction for u and d quarks can effectively reduce the Fermi sphere disparity between the two flavors of diquark paring. Thus the vector interaction works to significantly suppress the unstable region associated with chromomagnetic instability in the phase of neutral asymmetric homogenous CSC.

  ---

  lunch (3/10 (Wed) 12:10-13:40)

  ---

• Y. Kawaguchi (3/10 (Wed) 13:40-14:15)
  --- Topological Excitations in Spinor Dipolar Bose-Einstein Condensates
  The rich variety of the order parameter manifold of multicomponent Bose-Einstein condensates (BECs) admit various kinds of topological excitations. In this talk, I will talk about two topological excitations in spinor BECs: knots and non-Abelian vortices. Knots are the unique topological objects characterized by a linking number or a Hopf invariant ($pi_3 (S^2)=Z$). I will show that knots can be created using a conventional quadrupole magnetic field in a cold atomic system, and discuss their stability. In the latter part of my talk, I will discuss the collision dynamics of two non-Abelian vortices. We have found that unlike Abelian vortices, they neither reconnect themselves nor pass through each other, but create a rung between them in a topologically stable manner.
• A. Schmitt (3/10 (Wed) 14:15-14:50)
  --- Color superconductivity in dense matter
• I. Shovkovy (3/10 (Wed) 14:50-15:20)
  --- Abnormal normal ground state of dense relativistic matter in a magnetic field

  ---

  break (3/10 (Wed) 15:20-15:40)

  ---

• F. A. Karsch (3/10 (Wed) 15:40-16:10)
  --- O(N) universality and the chiral phase transition in QCD
  We discuss the scaling behavior of the chiral phase transition in (2+1)-flavor QCD in terms of scaling functions for 3-dimensional O(N) models. We show that numerical results are consistent with O(N) scaling in the chiral limit. We find that in the region of physical light quark mass values the temperature and quark mass dependence of the chiral condensate is already dominated by universal properties of QCD that are encoded in the scaling function for the chiral order parameter. We use this information on the magnetic equation of state to deduce the curvature of the transition line at non-zero baryon chemical potential.
• K. Redlich (3/10 (Wed) 16:10-16:40)
  --- Transport properties and scaling near chiral phase transition
  Thermodynamics and the phase structure of the Polyakov loop-extended two flavor chiral quark--meson model are explored based on the functional renormalization group method. Within this scheme, we derive the renormalization group flow equation for the scale dependent thermodynamic potential at finite temperature and density in the presence of symmetry breaking external field. We discuss the influence of quantum fluctuations and the background gluon field on the properties of the net-quark number density fluctuations and their higher moments. The influence of the chiral transtion on transport properties of a medium will be also discussed.

  ---

  party (Saloon of Research building) (3/10 (Wed) 18:40-)

  ---

• 3/11 (Thu) : 2nd day of the symposium
• M. Natsuume (3/11 (Thu) 09:00-09:30)
  --- Condensed-matter application of AdS/CFT duality
  I describe a condensed-matter application of the AdS/CFT duality: holographic superconductors. I review their basic properties and discuss two issues related to our work: its critical phenomena and magnetic response (holographic vortex lattice).
• Y.M. Kim (3/11 (Thu) 09:30-10:00)
  --- Quark number susceptibility with a finite chemical potential in holographic QCD
  We calculate the quark number susceptibility in holographic QCD. Main goal is to study how the susceptibility responds to external parameters such as the quark chemical potential and external magnetic field. Our results may shed some light on the QCD phase diagram.
• M. Huang (3/11 (Thu) 10:00-10:30)
  --- Holographic QCD model from heavy quark potential
  TBD

  ---

  break (3/11 (Thu) 10:30-10:50)

  ---

• S. Ejiri (3/11 (Thu) 10:50-11:20)
  --- Lattice QCD at finite temperature and density
• M. Lombardo (3/11 (Thu) 11:20-11:50)
  --- Mesoscopic analysis of the QCD phase diagram
• P. de Forcrand (3/11 (Thu) 11:50-12:20)
  --- Nuclear physics from lattice QCD at strong coupling
  We consider lattice QCD with one massless flavor of staggered quarks, in the strong coupling limit. In this limit, the full phase diagram as a function of temperature and baryon chemical potential can be obtained, including a tricritical point. The high-density phase represents dense nuclear matter. We measure the nuclear potential between two nucleons, and explain the origin of the nuclear attraction in our model. Finally, we measure the masses of atomic nuclei as a function of their atomic number. They are well described by the Bethe-Weiszacker formula.
• A. Ohnishi (3/11 (Thu) 12:20-12:30)
  --- Closing

9th week (QCD phase diagram) (3/15-19)

• K. Kanaya (3/15 (Mon) 10:00-11:00)
  --- QCD thermodynamics at zero and finite densities with improved Wilson quarks
• C. Schmidt (3/15 (Mon) 11:20-12:20)
  --- QCD critical point, Lattice QCD at nonzero density, Taylor expansion method
• I. Shovkovy (3/15 (Mon) 15:30-16:30)
  --- Relativistic Dynamics and Spontaneous Symmetry Breaking in Graphene (held also as a YITP colloquium)
  Graphene possesses truly remarkable properties from technological and theoretical points of view. Its low-energy quasiparticles are Dirac fermions. Such charge carries have high mobility and are responsible for the very efficient transport in graphene. Graphene can be also seen as an interesting toy model mimicking strongly coupled gauge dynamics of quark matter in certain dynamical regimes. This is due to the fact that the low-energy action of graphene possesses an approximate U(4) "flavor" symmetry, which resembles chiral symmetry of quantum chromodynamics. The dynamics responsible for its spontaneous breaking can be probed by studying the unusual features of the Quantum Hall effect in graphene. It will be argued that such a dynamics is the same as the dynamics of magnetic catalysis, studied in detail in relativistic models.
• M. Laine (3/16 (Tue) 09:30-)
  --- Basics of Thermal QCD (L)
  It has been a longstanding dream that experimental tests of thermal QCD through heavy ion collision experiments could yield theoretical insights that would be useful for some cosmological problems as well. These lectures cover selected topics within thermal QCD with this perspective in mind. The observables touched upon are the equation of state, viscosities, as well as the rates of elastic and inelastic reactions experienced by heavy quarks. Depending on the observable the focus will be either on elaborating on the basic concepts, on outlining the link between heavy ion collisions and cosmology, or on reviewing modern developments.
• Y. Maezawa (3/16 (Tue) 15:00-16:00)
  --- Thermodynamics and heavy-quark free energy at finite temperature in full-QCD lattice simulations with Wilson quarks
  We present recent results of free energies between a heavy quark and antiquark in full-QCD lattice simulations. The heavy-quark free energies express inter-quark interactions at finite temperature, and are intimately related to the fate of charmoniums and bottomoniums in quark-gluon plasma created in relativistic heavy-ion collisions. Simulations are performed with dynamical fermions of two degenerated $u,d$-quarks and one strange quark. We employ an $O(a)$ imporved Wilson-type quark action of which lattice discretization properties is precisely investigated by CP-PACS/JLQCD Collaboration, and calculate the free energies from spatial correlations between the Polyakov loops. From spatial behavior of the heavy-quark free energies, we discuss confinement properties before and after the deconfinement transition. Screening properties of quark-gluon plasma are also discussed and compared with previous studies which do not include the dynamical strange quark.
• M. Laine (3/17 (Wed) 09:30-)
  --- Basics of Thermal QCD (L)
  (see above)

  ---

  YITP Tea party (Saloon of Research Building) (3/17 (Wed) 15:00-15:30)

  ---

• H. Abuki (3/18 (Thu) 11:00-12:00)
  --- BEC-BCS crossover in high energy physics; QCD phase diagram and role of fluctuations
• V.I. Zakharov (3/18 (Thu) 14:00-15:00)
  --- Deconfinement phase transition and topology in QCD
• 3/19 (Fri) : Free Discussion

Posters in QCD Phase Diagram part (3/10 \& other days)

• S. Takemoto (3/10 \& other days )
  --- Quark number density in the phase with unbroken center Z2 symmetry in two-flavor QCD
  We study general features of thermodynamic quantities and hadron mass spectra in a possible phase where the chiral SU(2)L x SU(2)R symmetry is spontaneously broken while its center Z2 symmetry remains unbroken. In this phase, chiral symmetry breaking is driven by a quartic quark condensate although a bilinear quark condensate vanishes. A Ginzburg-Landau free energy leads to a new tricritical point (TCP) between the Z2 broken and unbroken phases. It is shown that the quark number susceptibility exhibits an enhancement at the restoration point of the center symmetry rather than that of the chiral symmetry. Comparison of hadron mass spectra between the Z2 broken and unbroken phases is also made.
• T. Sano (3/10 \& other days )
  --- QCD phase structure in a chiral random matrix model with $U_A(1)$ breaking
  TBA
• D. Kimura (3/10 \& other days )
  --- 3-flavor NJL model with dimensional regularization
  (If there is a short talk session, I want to present our work.) We consider two- and three-flavor Nambu--Jona-Lasinio (NJL) model at zero and non-zero temperature with the dimensional regularization. Since this model is non-renormalizable in four space-time dimensions, physical results may depend on the regularization method. We obtain the meson mass and the topological susceptibility in the dimensional regularization and compare the results with ones obtained in the cut-off regularization.
• Y. Sakai (3/10 \& other days )
  --- Determination of QCD phase diagram from the imaginary chemical potential region
  An approach to circumvent the sign problem is the analytic continuation to real chemical potential from imaginary one. We propose a new analytic continuation by using the Polyakov-loop extended Nambu--Jona-Lasinio (PNJL) model. The QCD partition function has the Roberge-Weiss (RW) periodicity at imaginary chemical potential. We revealed that the PNJL model has the RW periodicity and reproduces lattice date qualitatively at imaginary chemical potential. We determine the model strengths so as to reproduce lattice data on pseudocritical temperatures at imaginary chemical potential and predict the QCD phase diagram at real chemical potential. There is no sign problem at both real and imaginary isospin chemical potentials, therefore our proposal (the PNJL analytic continuation) is checkable there. We explore the phase diagram at imaginary baryon and isospin chemical potentials. QCD has no pion condensation there, and therefore has discrete symmetries like the RW periodicity. The PNJL model possesses all the discrete symmetries and can reproduce qualitatively lattice data.
• A.Yamamoto (3/10 \& other days )
  --- Relevant gluonic energy scales of color confinement and chiral symmetry breaking in lattice QCD
  We have formulated a framework to analyze the relevant energy gluonic scales of QCD phenomena in lattice QCD. We have applied this framework to the analyses for color confinement and chiral symmetry breaking.
• T.Z. Nakano (3/10 \& other days )
  --- Effective Potential in the Strong-coupling Lattice QCD with Next-to-Next-to-Leading Order and Polyakov Loop Effects
  In this study, we evaluate the effective potential in the strong-coupling lattice QCD including next-to-next-to-leading order and Polyakov loop effects. We also discuss the properties of the QCD phase diagram by using the effective potential, including the critical temperature and the position of the critical point. We find that the critical point is sensitive to the NNLO effects and, the critical temperature is consistent with that of MC results due to Polyakov loop effects at $\beta = 2N_c/g^2 \sim 4$.
• T. Iritani (3/10 \& other days )
  --- Gluon propagator in SU(3) lattice QCD: Yukawa-type gluon propagator and gluon spectral function
  We study the gluon propagator in the Landau gauge in SU(3) lattice QCD. We find that the gluon propagator is well described by the Yukawa-type function for r = 0.1-1.0 fm in the four-dimensional Euclidean space-time. Based on the Yukawa-type gluon propagator, we analytically derive gluonic effective mass and spectral function.
• H. Saito (3/10 \& other days )
  --- The QCD phase diagram in heavy quark region
• D. S. Zablocki (3/10 \& other days )
  --- Two particle correlations in dense quark matter
  We investigate mesonic and diquark correlations in the NJL model of QCD. We derive gaussian fluctuations around the mean field in the meson-diquark bosonized form of the partition function. The mode structure of these fluctuations is analyzed within the Nambu-Gorkov formalism thus including a color superconducting phase. Mixing between the scalar meson and diquark occurs in the condensed phase, which was omitted in the literature so far. In the chiral limit these terms are characteristic for the BEC-BCS crossover, which can be achieved by varying the coupling strength, as they are contributing only there.
• N. M. Bratovic (3/10 \& other days )
  --- Critical Point of the QCD Phase Diagram: Role of the axial U(1) Anomaly and Quark Mass Dependence
  Using an Nambu-Jona-Lasinio model for 2+1 flavors, extended by Polyakov-loop dynamics (PNJL model), we investigate the existence and location of the critical endpoint in the QCD phase diagram depending on the parameters of the model and explore their impact on the thermodynamics and the phase structure.
• D. Sato (3/10 \& other days )
  --- Anomalous spectral function of a fermion coupled with a massive vector particle at finite temperature - Persistence of a three-peak structure
  Motivated by the observation that hadronic excitation may exist in the QGP phase, we have analyzed the fermion spectral function in U(1) gauge theory in which the gauge boson acquire finite mass at finite temperature at one-loop order. We found that the three-peak structure appears at the fermion spectral function almost gauge-independently when temperature T is comparable with the vector boson mass m. We also analyzed the origin of this gauge-independence. On the other hand, in T $\gg$ m the spectral function depends on gauge and we can not calculate a physically correct spectral function in some gauge parameter. We elucidated the cause of this gauge-dependence. We also argue that the three-peak structure persists even in T $\gg$ m.
• A. Watanabe (3/10 \& other days )
  --- Axial Vector Anomaly Induced Effective $\nu-\gamma-N$ Interaction for Astrophysical Applications
• A. K. Rothkopf (3/10 \& other days )
  --- Static Heavy Quark Potential from the Thermal Wilson Loop