New bounds on R-parity violating couplings
Carl E. Carlson, Probir Roy, Marc Sher · 1995
We use information from rare nonleptonic decays of heavy-quark mesons to put new bounds on the magnitudes of certain product combinations of baryon nonconserving R-parity violating couplings in supersymmetric models. Product combinations of lepton and baryon nonconserving R-parity violating couplings are also considered in the light of existing bounds on nucleon decay. Contrary to popular impression, a few such combinations are shown to remain essentially unconstrained. 1 Though the minimal supersymmetric standard model (MSSM) [1] is a leading candidate for new physics beyond the standard model, the conservation of R-parity, Rp, which is assumed in the model has no real theoretical justification. This has motivated many authors [2] to consider alternatives in which Rp is explicitly broken. In such models, sparticles can decay into non-supersymmetric particles alone, leading to novel signatures in search experiments and unusual decay processes. The most general Rp-violating superpotential that one can write with the MSSM superfields, in the usual notation, is W = λijkLiLj Ēk + λ ′ ijkLiQj ¯ Dk + λ ′′