Searches for R-Parity Violating Decays of Gauginos at 183 GeV at LEP

TL;DR

This paper reports on searches for R-parity violating decays of gauginos at 183 GeV using LEP data, setting limits on their production cross-sections and exploring implications within the MSSM.

Contribution

First experimental search for R-parity violating gaugino decays at LEP energy, providing new constraints on supersymmetric models.

Findings

No excess events observed above Standard Model background.

Limits set on gaugino production cross-sections in R-parity violating scenarios.

Constraints established within the Minimal Supersymmetric Standard Model.

Abstract

Searches for pair-produced charginos and neutralinos with R-parity violating decays have been performed using a data sample corresponding to an integrated luminosity of 56 pb-1 collected with the OPAL detector at LEP at a centre-of-mass energy of 183 GeV. An important consequence of R-parity violation is that the lightest supersymmetric particle becomes unstable. The searches have been performed under the assumptions that the lightest supersymmetric particle promptly decays and that only one R-parity violating coupling is dominant for each of the decay modes considered. Such processes would yield multiple leptons, leptons plus jets, or multiple jets with or without significant missing energy in the final state. No excess of such events above Standard Model backgrounds has been observed. Limits are presented on the production cross-sections of gauginos in R-parity violating scenarios. Limits are also presented in the framework of the Minimal Supersymmetric Standard Model.