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

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arxiv hep-ph/0404261 v2 pith:Y4Q6MMAS submitted 2004-04-29 hep-ph

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

classification hep-ph
keywords squarkdatadimuonviolatingcouplingcouplingslimitmass
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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 $\MST \lsim 180$ GeV we found that the RPV couplings are roughly restricted to be within $\sim 10^{-4}$ 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.

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