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Progress of Theoretical Physics Supplement No. 167



The Jubilee of the Sakata Model


Proceedings of the International Symposium pnΛ 50

Edited by Masayasu Harada, Yoshio Ohnuki, Shoji Sawada and Koichi Yamawaki

This volume contains 14 papers presented at the ``International Symposium: The Jubilee of the Sakata Model'', held at Nagoya University on November 25th and 26th, 2006. The contributors include Professor G. 't Hooft and many eminent physicists. The volume also includes contributions from Professors H. J. Lipkin, Y. Nambu and L. B. Okun, who were not able to attend the symposium but kindly accepted our invitation to publish papers in the Proceedings.

The Sakata Model was proposed by Shoichi Sakata, late Professor of Nagoya University, and was a key step toward the quark model. The paper in which this model is proposed was published in December 1956 in Progress of Theoretical Physics, Vol. 16 (1956), pp. 686-688. Not merely a prototype of the quark model, the Sakata Model was developed by Sakata himself, together with Z. Maki, M. Nakagawa and Y. Ohnuki, into a larger picture composite model (the ``Nagoya Model'') to include leptons. This led to a revolutionary step, the neutrino flavor mixing, so-called Maki-Nakagawa-Sakata (MNS) matrix. Furthermore, the Kobayashi-Maskawa (KM) matrix describing quark flavor mixing and $CP$ violation was proposed by Sakata's disciples, M. Kobayashi and T. Maskawa. The MNS and KM matrices are now established as THE theory of the flavors of quarks and leptons in modern particle physics.

The symposium was held to celebrate the 50th anniversary of the Sakata Model and its subsequent great developments. The symposium was devoted to historical reviews of the Sakata Model and related developments and also to various perspectives of particle theory today. The volume will be of value to those who are interested in the modern view of a dramatic history of the Sakata model developed into the quark model, a glorious history of Sakata school which led to establishing the flavor physics in modern particle physics, and all that.


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