Search for charginos, neutralinos and gravitinos in e+ e- interactions at S**(1/2) = 183-GeV

Abreu, P.;Cortina Gil, Eduardo;DELPHI Collaboration;et.al.
(1999) Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics — Vol. 446, n° 1, p. 75-91 (1999)

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An update of the searches for charginos and neutralinos is presented, based on a data sample corresponding to the 53.9 pb−1 recorded by the DELPHI detector in 1997, at a centre-of-mass energy of 183 GeV. No evidence for a signal was found. The lower mass limits are 4–5 GeV/c2 higher than those obtained at a centre-of-mass energy of 172 GeV. The (μ,M2) domain excluded by combining the neutralino and chargino searches implies a limit on the mass of the lightest neutralino which, for a heavy sneutrino, is constrained to be above 29.1 GeV/c2 for tanβ≥ 1.
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Abreu, P., Cortina Gil, E., DELPHI Collaboration, & et al. (1999). Search for charginos, neutralinos and gravitinos in e+ e- interactions at S**(1/2) = 183-GeV. Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics, 446(1), 75-91. https://doi.org/10.1016/S0370-2693(98)01526-3 (Original work published 1999)