R--Parity Violating Signals for Chargino Production at LEP II

Abstract

We study chargino pair production at LEP II in supersymmetric models with spontaneously broken R-parity. We perform signal and background analyses, showing that a large region of the parameter space of these models can be probed through chargino searches at LEP II. In particular, we determine the attainable limits on the chargino mass as a function of the magnitude of the effective bilinear R-parity violation parameter $\epsilon$, demonstrating that LEP II is able to unravel the existence of charginos with masses almost up to its kinematical limit even in the case of R-parity violation. This requires the study of several final state topologies since the usual MSSM chargino signature is recovered as $\epsilon \to 0$. Moreover, for sufficiently large $\epsilon$ values, for which the chargino decay mode ${\chi }^{\pm }\to {\tau }^{\pm }J$ dominates, we find through a dedicated Monte Carlo analysis that the ${\chi }^{\pm }$ mass bounds are again very close to the kinematic limit. Our results establish the robustness of the chargino mass limit, in the sense that it is basically model-independent. They also show that LEP II can establish the existence of spontaneous R-parity violation in a large region of parameter space should charginos be produced.

improved analyses; 31 pages and 9 figures (included)

References in corpus (3)

• Minimal Supergravity with R-Parity Breaking
• Neutralino Decay Rates with Explicit R-parity Violation
• Tau Lepton Mixing with Charginos and its Effects on Chargino Searches at e+e- Colliders

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• Anomaly Mediated Supersymmetry Breaking without R-Parity
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• Top-Quark Phenomenology in Models with Bilinearly and Spontaneously Broken R-parity
• Reconciling neutrino anomalies in a simple four-neutrino scheme with R-parity violation
• Neutralino Phenomenology at LEP2 in Supersymmetry with Bilinear Breaking of R-parity
• Probing neutrino mass with multilepton production at the Tevatron in the simplest R-parity violation model
• Search for Spontaneous R-parity violation at sqrt(s) = 183 GeV and 189 GeV
• Neutrino Physics from Charged Higgs and Slepton Associated Production in AMSB
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