Speaker
Prof.
Yoshio Koide
(Osaka University)
Description
In the yukawaon model, effective Yukawa coupling constants
$Y_f^{eff}$ are given by vacuum expectation values (VEVs) of
gauge singlet scalars $Y_f$ ("yukawaons"): $(Y_f^{eff})_{ij}
=(y_f/\Lambda) \langle (Y_f)_{ij} \rangle$ ($i,j=1,2,3$),
where $\Lambda$ is a scale of an effective theory. Differently
from a Froggatt-Nielsen type model, we introduce each yukawaon
$Y_f$ for each fermion sector $f$ ($f=u,d, \dots$). A unified
description of quark and lepton mass matrices is realized by
introducing a further fundamental scalar field $\Phi_e$ and
by considering that each VEV structure $\langle Y_f \rangle$
is given by a bilinear form of the VEV matrix $\langle \Phi_e
\rangle$. Such VEV matrix relations are obtained from
supersymmetric vacuum conditions for a superpotential which
is invariant under flavor symmetries concerned. As a result,
the observed tribimaximal neutrino mixing, CKM quark mixing,
and quark mass ratios are explained with quite few parameters,
without assuming any discrete symmetry for the neutrino sector.
References:
Y.Koide, Phys.Lett. B680, 76 (2009);
Y.Koide, Phys.Lett. B687, 219 (2010).
Primary author
Prof.
Yoshio Koide
(Osaka University)
