Indirect Constraints on R-parity Violating Stop Couplings

In the Minimal Supersymmetric Standard Model (MSSM) it is assumed that R-parity (Rp) is conserved . While the particles of the Standard Model are even under Rp, their supersymmetric partners are odd, thus the latter can only be produced in pairs and they always decay into final states involving an odd number of supersymmetric particles. Although it considerably simplifies the structure of the MSSM, the conservation of R-parity has no firm theoretical justification (for a review and references on versions of the MSSM with broken R-parity, see e.g. ref. ). The most general Rpviolating superpotential that can be written with the MSSM superfields contains both lepton number and baryon number violating terms. Their simultaneous presence is in fact strongly limited, since it would induce fast proton decay. However, it is possible to allow for the presence of baryon number violating couplings only , coming from the superpotential