Search for Supersymmetry with a dominant R-Parity violating LLE Coupling in e+e- Collisions at centre-of-mass energies of 130 to 172 GeV

TL;DR

This paper reports a search for supersymmetric particles with R-parity violation via LLE coupling in electron-positron collisions at energies of 130-172 GeV, setting new mass limits based on observed data.

Contribution

First search for supersymmetric particles with dominant R-parity violating LLE coupling at these energies, establishing new exclusion limits.

Findings

No excess events observed beyond Standard Model expectations.

Charginos with masses below 73 GeV are excluded at 95% CL.

Neutralinos with masses below 23 GeV are excluded at 95% CL.

Abstract

A search for pair-production of supersymmetric particles under the assumption that R-parity is violated via a dominant LLE coupling has been performed using the data collected by ALEPH at centre-of-mass energies of 130-172 GeV. The observed candidate events in the data are in agreement with the Standard Model expectation. This is translated into lower limits on the mass of charginos, neutralinos, sleptons, sneutrinos and squarks. For instance, charginos with masses less than 73 GeV and neutralinos with masses less than 23 GeV are excluded at 95% confidence level for any generation structure of the LLE coupling, and for neutralino, slepton or sneutrino LSPs.