S3 symmetry and the quark mixing matrix

We impose an S3 symmetry on the quark fields under which two of three quarks transform like a doublet and the remaining one as singlet, and use a scalar sector with the same structure of SU(2) doublets. After gauge symmetry breaking, a Z2 subgroup of the S3 remains unbroken. We show that this unbrok...

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Bibliographic Details
Published in:Physics letters. B 2016-02, Vol.753 (C), p.315-318
Main Authors: Das, Dipankar, Dey, Ujjal Kumar, Pal, Palash B.
Format: Article
Language:English
Online Access:Get full text
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Summary:We impose an S3 symmetry on the quark fields under which two of three quarks transform like a doublet and the remaining one as singlet, and use a scalar sector with the same structure of SU(2) doublets. After gauge symmetry breaking, a Z2 subgroup of the S3 remains unbroken. We show that this unbroken subgroup can explain the approximate block structure of the CKM matrix. By allowing soft breaking of the S3 symmetry in the scalar sector, we show that one can generate the small elements, of quadratic or higher order in the Wolfenstein parametrization of the CKM matrix. We also predict the existence of exotic new scalars, with unconventional decay properties, which can be used to test our model experimentally.
ISSN:0370-2693
1873-2445
DOI:10.1016/j.physletb.2015.12.038