Search for chargino and neutralino production in e+e- collisions at √s = 161 GeV

The OPAL Collaboration

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26 Scopus citations


Charginos and neutralinos, predicted by supersymmetric theories, have been searched for in e e collisions with an integrated luminosity of 10.0 pb-1 at a centre-of-mass energy of √s = 161 GeV with the OPAL detector at LEP. Two candidate events are selected; consistent with the total background estimate of 0.7 ± 0.2 events. The 95% C.L. lower limit on the lightest chargino mass in the Minimal Supersymmetric Standard Model is 78.5 GeV if the universal scalar mass m0 is greater than 1 TeV, and 62.0 GeV for the smallest mo compatible with slepton and sneutrino mass limits obtained at centre-of-mass energies near the Z peak. These limits were obtained under the conditions that the lightest chargino is heavier than the lightest neutralino by more than 10 GeV and tanβ = 1.5. The new exclusion limits significantly improve on the results obtained at √s= 130 and 136 GeV.

Original languageEnglish
Pages (from-to)616-630
Number of pages15
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Issue number3
StatePublished - 19 Dec 1996
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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