88 research outputs found
R-Parity Violation and Family Symmetry
In this talk, we investigate the implications of R-parity violating (RPV)
operators in a model with family symmetry. Family symmetry can determine the
form of RPV operators as well as the Yukawa matrices. We consider a concrete
model with non-abelian discrete symmetry Q_6, which has only three RPV
trilinear operators with no baryon number violating terms. We find that ratios
of decay rates of the lepton flavor violating processes are fixed thanks to the
family symmetry, predicting BR(tau to 3e)/BR(tau to 3mu) ~ 4
m_{mu}^2/m_{tau}^2.Comment: 11pages, 2 figures. Talk given at CTP symposium on Supersymmetry at
LHC: Theoretical and Experimental Perspectives, The British University in
Egypt, Cairo, Egypt, 11-14 March 200
Electron/Muon Specific Two Higgs Doublet Model
We discuss two Higgs doublet models with a softly-broken discrete
symmery, where the mass matrix for charged-leptons is predicted
as the diagonal form in the weak eigenbasis of lepton fields. Similar to an
introduction of symmetry, the tree level flavor changing neutral
current can be forbidden by imposing the symmetry to the model.
Under the symmetry, there are four types of Yukawa interactions
depending on the charge assignment to right-handed fermions. We
find that extra Higgs bosons can be muon and electron specific in one of four
types of the Yukawa interaction. This property does not appear in any other two
Higgs doublet models with a softly-broken symmetry. We discuss
the phenomenology of the muon and electron specific Higgs bosons at the Large
Hadron Collider; namely we evaluate allowed parameter regions from the current
Higgs boson search data and discovery potential of such a Higgs boson at the 14
TeV run.Comment: 17 pages, 5 figures, 6 tables; version published in Nuclear Physics
Light Dark Matter Candidate in B-L Gauged Radiative Inverse Seesaw
We study a radiative inverse seesaw model with local B-L symmetry, in which
we extend the neutrino mass structure that is generated through a kind of
inverse seesaw framework to the more generic one than our previous work. We
focus on a real part of bosonic particle as a dark matter and investigate the
features in O(1-80) GeV mass range, reported by the experiments such as CoGeNT
and XENON (2012).Comment: 10 pages, 1 table, 3 figures; version accepted for publication in
European Physical Journal
The SUSY Flavor Problem, Proton Decay and Discrete Family Symmetry
We consider a supersymmetric extension of the standard model, which possess a
family symmetry based on a binary dihedral group Q6, and investigate the
consequences of the family symmetry on the mixing of fermions, FCNCs and the
stability of proton.Comment: 5 pages, 1 figure, to appear in Proceedings of SUSY06, the 14th
International Conference on Supersymmetry and the Unification of Fundamental
Interactions, UC Irvine, California, 12-17 June 200
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