48,792 research outputs found
R_b and R_l in MSSM without R-Parity
We examined Z\ell^+\ell^- and Zb\bar b couplings in the minimal
supersymmetric model (MSSM) with explicit R-parity violating interactions. We
found the top quark L-violating couplings \lambda'_{i3k} and B-violating
couplings \lambda''_{3j3} could give significant contributions through the top
quark loops. To accomadate the latest R_{\ell} data, \lambda'_{i3k} are suject
to stringent bounds, some of which can be much stronger than the current
bounds. Within the current perturbative unitarity bound of 1.25 for
\lambda''_{3j3}, the R_b value in R-violating MSSM agrees well with the
experimental data at level, but may lie outside the 1\sigma range
depending on the involved sfermion mass.Comment: results update
Baryogenesis and Asymmetric Dark Matter from The Left-Right Mirror Symmetric Model
The paper suggests a left-right mirror symmetric model to account for the
baryogenesis and asymmetric dark matter. The model can simultaneously
accommodate the standard model, neutrino physics, matter-antimatter asymmetry
and dark matter. In particular, it naturally and elegantly explains the origin
of the baryon and dark matter asymmetries, and clearly gives the close
interrelations of them. In addition, the model predicts a number of interesting
results, e.g. the cold dark matter neutrino mass is times the proton
mass. It is also feasible and promising to test the model in future
experiments.Comment: 24 pages, 4 figures. arXiv admin note: text overlap with
arXiv:1309.195
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