The data recorded by the ALEPH detector at centre-of-mass energies of 161, 170, and 172 GeV are analysed for signals of chargino and neutralino production. No evidence of a signal is found, although candidate events consistent with the expectations from Standard Model processes are observed. Limits at 95% C.L. on the production cross sections are derived and bounds on the parameters of the Minimal Supersymmetric Standard Model are set. The lower limit on the mass of the lightest ch is 85.5 GeVc2 for gaugino-like charginos (=−500GeVc2 ), and 85.0 GeVc2 for Higgsino-like charginos (M2=500GeVc2 ), for heavy sneutrinos (M200GeVc2 ) and tan=2 . The effect of light sleptons on chargino and neutralino limits is investigated. The assumptions of a universal slepton mass and a universal gaugino mass are relaxed, allowing less model-dependent limits to be obtained.

Searches for charginos and neutralinos in e+e- collisions at √s = 161 and 172 GeV / R. Barate et al.; V. Ciulli; E. Focardi. - In: THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS. - ISSN 1434-6044. - ELETTRONICO. - 2:(1998), pp. 417-439. [10.1007/s100500050139]

Searches for charginos and neutralinos in e+e- collisions at √s = 161 and 172 GeV

CIULLI, VITALIANO;FOCARDI, ETTORE
1998

Abstract

The data recorded by the ALEPH detector at centre-of-mass energies of 161, 170, and 172 GeV are analysed for signals of chargino and neutralino production. No evidence of a signal is found, although candidate events consistent with the expectations from Standard Model processes are observed. Limits at 95% C.L. on the production cross sections are derived and bounds on the parameters of the Minimal Supersymmetric Standard Model are set. The lower limit on the mass of the lightest ch is 85.5 GeVc2 for gaugino-like charginos (=−500GeVc2 ), and 85.0 GeVc2 for Higgsino-like charginos (M2=500GeVc2 ), for heavy sneutrinos (M200GeVc2 ) and tan=2 . The effect of light sleptons on chargino and neutralino limits is investigated. The assumptions of a universal slepton mass and a universal gaugino mass are relaxed, allowing less model-dependent limits to be obtained.
1998
2
417
439
R. Barate et al.; V. Ciulli; E. Focardi
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/638726
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