and R l in MSSM without R - Parity
نویسنده
چکیده
We examined Zl+l− and Zbb̄ couplings in the minimal supersymmetric model (MSSM) with explicit R-parity violating interactions. We found the top quark L-violating couplings λi3k and B-violating couplings λ ′′ 3j3 could give significant contributions through the top quark loops. To accomadate the latest Rl 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 Rb value in R-violating MSSM agrees well with the experimental data at 2σ level, but may lie outside the 1σ range depending on the involved sfermion mass. Typeset using REVTEX Address after March of 2000: Institute of Theoretical Physics, Academia Sinica, Beijing, China
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