Update of the search for charginos nearly mass-degenerate with the lightest neutralino

Abstract : The data collected by DELPHI in 1998 at the centre-of-mass energy of 189~GeVhave been used to update the search for charginos nearly mass-degenerate withthe lightest supersymmetric particle, which is assumed to be the lightest neutralino. Mass differences below $\Delta M\!=\!3$~GeV/c$^2$ are considered.No excess of events with respect to the Standard Model expectation has beenobserved, and exclusions in the plane of $\Delta M$ versus chargino mass are given. The new $\Delta M$ independent lower limit on the mass of the charginois $62.4$~GeV/c$^2$ in the higgsino scenario (which includes the gaugino massunification scenario), if all sfermions are heavier than the lightest chargino.In the approximation of large sfermion masses the limit is $59.8$~GeV/c$^2$,independently of the field content.
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Journal articles

Cited literature [6 references]

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Submitted on : Friday, July 21, 2000 - 12:46:43 PM
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• HAL Id : in2p3-00005638, version 1

Citation

P. Abreu, W. Adam, T. Adye, P. Adzic, I. Ajinenko, et al.. Update of the search for charginos nearly mass-degenerate with the lightest neutralino. Physics Letters B, Elsevier, 2000, 485, pp.95-106. ⟨in2p3-00005638⟩

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