Affiliation:
1. Physical Research Laboratory
Abstract
A mechanism to generate realistic fermion mass hierarchies based on
supersymmetric gauged U(1)_FU(1)F
symmetry in flat five-dimensional (5D) spacetime is proposed. The fifth
dimension is compactified on S^1/Z_2S1/Z2
orbifold. The standard model fermions charged under the extra abelian
symmetry along with their superpartners live in the 5D bulk. Bulk masses
of fermions are generated by the vacuum expectation value of
N=2N=2
superpartner of U(1)_FU(1)F
gauge field, and they are proportional to U(1)_FU(1)F
charges of respective fermions. This decides localization of fermions in
the extra dimension, which in turn gives rise to exponentially
suppressed Yukawa couplings in the effective 4D theory. Anomaly
cancellation puts stringent constraints on the allowed
U(1)_FU(1)F
charges which leads to correlations between the masses of quarks and
leptons. We perform an extensive numerical scan and obtain several
solutions for anomaly-free U(1)_FU(1)F,
which describe the observed pattern of fermion masses and mixing with
all the fundamental parameters of order unity. It is found that the
possible existence of SM singlet neutrinos substantially improves the
spectrum of solutions by offering more freedom in choosing
U(1)_FU(1)F
charges. The model predicts Z^\primeZ′
boson mediating flavour violating interactions in both the quark and
lepton sectors with the couplings which can be explicitly determined
from the Yukawa couplings.
Funder
Department of Science and Technology, Ministry of Science and Technology
Subject
General Physics and Astronomy
Cited by
3 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献