R_b and R_l in MSSM without R-Parity

Abstract

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 λ'_{i3k} and B-violating couplings λ''_{3j3} could give significant contributions through the top quark loops. To accomadate the latest R_{\ell} data, λ'_{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 λ''_{3j3}, the R_b value in R-violating MSSM agrees well with the experimental data at $2\sigma$ level, but may lie outside the 1σrange depending on the involved sfermion mass.

results updated

Cited by in corpus (9)

• Top quark forward-backward asymmetry at the Tevatron: a comparative study in different new physics models
• New physics effects on top quark spin correlation and polarization at the LHC: a comparative study in different models
• R-parity violating effects in top quark FCNC productions at LHC
• Lepton flavor-changing processes in R-parity violating MSSM: Z->l_i l_j and γγ->l_i l_j under new bounds from l_i->l_j γ
• A Detailed Analysis of Flavour-changing Decays of Top Quarks as a Probe of New Physics at the LHC
• Probing R-parity Violating Interactions from Top Quark Polarization at LHC
• SUSY effects in $R_b$: revisited under current experimental constraints
• Constraining R-parity-violating couplings in $\tau$-processes at the LHC and in electroweak precision measurements
• R_b Constraints on Littlest Higgs Model with T-parity