Tau Signals of R-parity breaking at LEP 200

Abstract

The detectability at LEP 200 of explicit $R$-parity breaking by tau-number $(L_{\tau })$ violating operators is considered. The assumption of $L_{\tau }$-violation is motivated by the relative lack of constraints on such couplings but similar considerations apply to explicit $L_e$- or $L_{\mu }$-violation. The $LSP$, now unstable, and not necessarily neutral, decays via $L_{\tau }$-violating modes. Only signals from the production and decays of $LSP$ pairs are considered, thereby avoiding any dependence on the sparticle mass spectrum. Rather spectacular signals are predicted: spherical events with $m$ leptons (usually containing at least one $\tau$) and $n$ jets $(m,n\le 4)$, the most characteristic of which are like-sign $\tau \tau$ events. These signals are enumerated for each $LSP$ candidate and quantitative estimates are provided for the favoured case when the $LSP$ is a neutralino. Other new physics signals, which can mimic these signatures, are also briefly discussed.

27 pages in PHYZZX, six figures (not included, available on request). TIFR/TH/92-29,UH-511-751-92,CERN-TH.6613/92

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