Tau signals of R-parity breaking at LEP 200

Godbole, Rohini M. ; Roy, Probir ; Tata, Xerxes (1993) Tau signals of R-parity breaking at LEP 200 Nuclear Physics B, 401 (1-2). pp. 67-92. ISSN 0550-3213

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/055032...

Related URL: http://dx.doi.org/10.1016/0550-3213(93)90298-4


The detectability at LEP 200 of explicit R-parity breaking by tau-number (Lτ) violating operators is considered. The assumption of Lτ-violation is motivated by the relative lack of constraints on such coupling but similar considerations apply to explicit Le or Lμ-violation. The LSP, now unstable, and not necessarily neutral, decays via Lτ-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 τ) and n jets (m, n ≤ 4), the most characteristic of which are like-sign ττ 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.

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