Journal article

Search for chargino and neutralino production at √s = 170 and 172 GeV at LEP

K Ackerstaff, G Alexander, J Allison, N Altekamp, KJ Anderson, S Anderson, S Arcelli, S Asai, D Axen, G Azuelos, AH Ball, E Barberio, RJ Barlow, R Bartoldus, JR Batley, S Baumann, J Bechtluft, C Beeston, T Behnke, AN Bell Show all

European Physical Journal C | Published : 1998

Abstract

A search for charginos and neutralinos, predicted by supersymmetric theories, has been performed using a data sample of 10.3 pb-1 at centre-of-mass energies of √s =170 and 172 GeV with the OPAL detector at LEP. No evidence for these particles has been found. The results are combined with those from previous OPAL chargino and neutralino searches at lower energies to obtain limits. Exclusion regions at 95% C.L. of parameters of the Minimal Supersymmetric Standard Model are determined. Within this framework, for tan β ≥ 1.0, lower mass limits are placed on the lightest chargino and the three lightest neutralinos. The 95% C.L. lower mass limit on the lightest chargino, assuming that it is heavie..

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