Search for charginos in e+e- interactions at sqrt(s) = 189 GeV

Abreu, P.;Cortina Gil, Eduardo;DELPHI Collaboration;et.al.
(2000) Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics — Vol. 479, n° 1-3, p. 129-143 (2000)

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Abstract
An update of the searches for charginos and gravitinos is presented, based on a data sample corresponding to the 158 pb^{-1} recorded by the DELPHI detector in 1998, at a centre-of-mass energy of 189 GeV. No evidence for a signal was found. The lower mass limits are 4-5 GeV/c^2 higher than those obtained at a centre-of-mass energy of 183 GeV. The (\mu,M_2) MSSM domain excluded by combining the chargino searches with neutralino searches at the Z resonance implies a limit on the mass of the lightest neutralino which, for a heavy sneutrino, is constrained to be above 31.0 GeV/c^2 for tan(beta) \geq 1.
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Abreu, P., Cortina Gil, E., DELPHI Collaboration, & et al. (2000). Search for charginos in e+e- interactions at sqrt(s) = 189 GeV. Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics, 479(1-3), 129-143. https://doi.org/10.1016/S0370-2693(00)00313-0 (Original work published 2000)