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

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

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DELPHI Collaboration; Alemany Fernández, Reyes; Cabrera Urbán, Susana; Castillo Giménez, María Victoria; Cortina Gil, Eduardo; Costa Mezquita, María José; Ferrer Soria, Antonio; Fuster Verdú, Juan A.; García García, Carmen; Gil Botella, Inés; Hernández Rey, Juan José; Higón Rodríguez, Emilio; Martínez Vidal, Fernando; Oyanguren Campos, Arantza; Salt Cairols, José; Tortosa Martínez, Pablo

Aquest document és un/a article, creat/da en: 2000

Este documento está disponible también en : 10.1016/S0370-2693(00)00313-0

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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