Speaker
Yoshio Koide
(Osaka University, Japan)
Description
It is well known that a mass relation for the charged leptons,
$(m_e +m_\mu + m_\tau)/(\sqrt{m_e} +\sqrt{m_\mu} +\sqrt{m_\tau})^2
=2/3$, is excellently satisfied by the observed masses (pole mass).
However, this excellent coincidence is just a big problem, because
``mass" in a field theoretical model means a running mass, not
pole mass. For this problem, Sumino has proposed a way out by
introducing family gauge bosons. But his model is a model with
non-anomaly free, so that the model is not so attractive.
A model with anomaly free
proposed by Yamashita and Y.K. is
reviewed together with recent progress.
Author
Yoshio Koide
(Osaka University, Japan)
