Search for charginos, neutralinos and gravitinos at LEP
(1998) European Physical Journal C. Particles and Fields — Vol. 1, n° 1-2, p. 1-20 (1998)
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- Abstract
- An update of the searches for charginos and neutratinos in DELPHI is presented, based mainly on recent data collected at centre-of-mass energies of 161 GeV and 172 GeV. No signal is found. For a sneutrino with mass above 300 GeV/c 2 and a mass difference between the chargino and the lightest neutralino above 10 GeV/e 2, the lower limit at 95% confidence level on the chargino mass ranges from 84.3 GeV/e 2 to the kinematical limit (86.0 GeV/c2), depending on the mixing parameters. The limit decreases for lower chargino-neutralino mass differences. The limit in the case of a light sneutrino is 67.6 GeV/c 2, provided that that there is no light sneutrino with a mass within 10 GeV/e 2 below the chargino mass. Upper limits on neutralino pair production cross-sections of about a pieobarn are derived. The (#, M2) domain excluded in the MSSM-GUT scenario is determined by combining the neutralino and chargino searches. These results imply a limit on the mass of the lightest neutralino which, for a heavy sneutrino, is constrained to be above 24.9 GeV/c 2 for tan~ >_ 1. The search has also been extended to the case where the lightest neutralino is unstable and decays into a photon and a gravitino.
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Citations
Abreu, P., Cortina Gil, E., DELPHI Collaboration, & et al. (1998). Search for charginos, neutralinos and gravitinos at LEP. European Physical Journal C. Particles and Fields, 1(1-2), 1-20. https://doi.org/10.1007/s100520050058 (Original work published 1998)