R-parity violation, sneutrino mixing phenomena and CP-violation in p \bar p -> sneutrino -> l^+ l^- + X

Abstract

The sneutrino resonance reactions p \bar p -> sneutrino -> l^+ l^- +X, for l=e,μ,τ, in the MSSM without R-parity are considered. We perform a cross-section analysis and show that present limits on some products of R-parity violating couplings in the sneutrino sector can be significantly improved in future upgraded Fermilab Tevatron runs. Furthermore, we introduce CP-violating and CP-conserving τ-spin asymmetries which are generated already at the TREE-LEVEL in the reaction p \bar p -> sneutrino -> τ^+ τ^- +X if there is muon-sneutrino - \bar muon-sneutrino mixing and that vanish in the SM. We find, for example, that for muon-sneutrino masses in the range 150 GeV < m_{muon-sneutrino} < 450 GeV, these spin asymmetries reach ~ 20 - 30% and ~ 10% for mass splitting between the muon-sneutrino CP-odd and CP-even states at the level of Δm ~ Γand Δm ~ Γ/4, respectively, where Γis the muon-sneutrino width. Both the CP-violating and the CP-conserving spin asymmetries should be detectable in future Tevatron runs even for a heavy sneutrino with a mass < 500 GeV. If detected, such asymmetries - being proportional to the mass splitting between the CP-even and CP-odd sneutrino states - may serve as a strong indication for the existence of the sneutrino mixing phenomenon.

27 pages, plain latex, 5 figures embadded in the text using epsfig. Final version as will appear in Phys. Rev. D. Main revisions made: updated and added references, additions to the discussion of spin-asymmetries in section 3

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• Basis independent study of Supersymmetry without R-parity and the tau neutrino mass
• Basis-independent analysis of the sneutrino sector in R-parity violating supersymmetry
• Broken R Parity Contributions to Flavor Changing Rates and CP Asymmetries in Fermion Pair Production at Leptonic Colliders
• Resonant sneutrino production in Supersymmetry with R-parity violation at the LHC
• Distinguishing Indirect Signatures of New Physics at the NLC: Z' Versus R-Parity Violation
• Indirect Searches for $Z^{\prime }$-like Resonances at the LHC
• Lepton flavor-changing processes in R-parity violating MSSM: Z->l_i l_j and γγ->l_i l_j under new bounds from l_i->l_j γ
• Signals of sneutrino-antisneutrino mixing in an $e^{-}\gamma$ collider in anomaly-mediated supersymmetry breaking
• New scalar resonances from sneutrino-Higgs mixing in supersymmetry with small lepton number (R-parity) violation
• Single sneutrino production at hadron colliders
• Sneutrino-Higgs mixing in WW and ZZ production in supersymmetry with R-parity violation
• CP Violating Asymmetries in the Flavor Changing Single Top Quark Production