Observing Virtual LSPs at LEP II

Details Observing Virtual LSPs at LEP II Observing Virtual LSPs at LEP II

1994-11-29

arxiv.org/abs/hep-ph/9411435v2

Phys.Lett. B349 (1995) 113-117

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages,latex,4 figs(available from the authors on request)

Scientific paper

10.1016/0370-2693(95)00225-A

In the minimal supersymmetric extension of the Standard Model (MSSM) with $R$-parity conservation the possibility that the sneutrino and the second lightest neutralino decay dominantly into invisible channels and, in addition to the lightest neutralino, carry missing energy, is still open --- both theoretically and experimentally. It is shown that for a large region of the parameter space allowed by {\rm LEP-I} data, these particles can contribute significantly to the process $e^+ e^- \longrightarrow \gamma$ + {\rm nothing}. This signal, if it exists, can be easily detected at {\rm LEP-II} as an enhancement over the Standard Model or the conventional MSSM predictions.

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