Constraining R-parity violating couplings using dimuon data at Tevatron Run-II

Abstract

The dimuon plus dijet signal is analyzed in the top squark pair production at Tevatron Run-II experiment and the total event rate is compared with the existing dimuon data. This comparison rules out top squark mass upto 188 (104) GeV for the branching fraction 100% (50%) of top squark decay into the muon plus quark via lepton number violating coupling. Interpretation of this limit in the framework of R-parity violating (RPV) SUSY model puts limit on relevant RPV coupling for a given top squark mass and other supersymmetric model parameters. If m_t1^~≲180 GeV we found that the RPV couplings are roughly restricted to be within ∼¹⁰−4 which is at the same ballpark value obtained from the neutrino data. The limits are very stringent for a scenario where top squarks appear to be the next lightest supersymmetric particles.