Quark Mixings in $SU(6)\times SU(2{)}_R$ and Suppression of $V_{ub}$

Abstract

The quark mixing matrix $V_{CKM}$ is studied in depth on the basis of superstring inspired $SU(6)\times SU(2{)}_R$ model with global flavor symmetries. The sizable mixings between right-handed down-type quark $D^c$ and colored Higgs field $g^c$ potentially occur but no such mixings in up-type quark sector. In the model the hierarchical pattern of $V_{CKM}$ is understood systematically. It is shown that due to large $D^c$-$g^c$ mixings $V_{ub}$ is naturally suppressed compared to $V_{td}$. It is pointed out that the observed suppression of $V_{ub}$ is in favor of the presence of $SU(2{)}_R$ gauge symmetry but not in accord with generic SU(5) GUT.

arXiv comment10pages with no figure, Latex file

References in corpus (5)

• Study of the atmospheric neutrino flux in the multi-GeV energy range
• Fermion Masses and Mixings in a String Inspired Model
• Large Lepton Flavor Mixing and E_6-type Unification Models
• The CKM Matrix and Its Origin
• The Aligned $SU(5)\times U(1{)}^2$ Model

Cited by in corpus (3)

• Large lepton flavor mixings in $SU(6)\times SU(2{)}_R$ model
• Maki-Nakagawa-Sakata matrix and Froggatt-Nielsen mechanism
• Quark CP-Phase and Froggatt-Nielsen Mechanism