Searches for Charginos and Neutralinos in e+e- Collisions at sqrt(s) = 161 and 172 GeV

TL;DR

This paper reports on searches for charginos and neutralinos in e+e- collisions at energies of 161 and 172 GeV, setting new mass limits and constraints within the Minimal Supersymmetric Standard Model.

Contribution

It provides the first limits on chargino and neutralino production at these energies, including less model-dependent bounds by relaxing common assumptions.

Findings

No evidence of chargino or neutralino signals was observed.

Lower mass limit for the lightest chargino is approximately 85 GeV/c^2.

Constraints on MSSM parameters were derived from the data.

Abstract

The data recorded by the ALEPH detector at centre-of-mass energies of 161, 170, and 172 GeV are analysed for signals of chargino and neutralino production. No evidence of a signal is found, although candidate events consistent with the expectations from Standard Model processes are observed. Limits at 95% C.L. on the production cross sections are derived and bounds on the parameters of the Minimal Supersymmetric Standard Model are set. The lower limit on the mass of the lightest chargino is 85.5 GeV/c^2 for gaugino-like charginos (mu = -500 GeV/c^2), and 85.0 GeV/c^2 for Higgsino-like charginos (M_2 = 500 GeV/c^2), for heavy sneutrinos (M(snu) > 200 GeV/c^2) and tanb = sqrt(2). The effect of light sleptons on chargino and neutralino limits is investigated. The assumptions of a universal slepton mass and a universal gaugino mass are relaxed, allowing less model-dependent limits to be obtained.