# Search for charginos with a small mass difference to the lightest supersymmetric particle at $\sqrt{s}$ = 189 GeV

3 CMS
IP2I Lyon - Institut de Physique des 2 Infinis de Lyon
Abstract : A search for charginos nearly mass-degenerate with the lightestsupersymmetric particle isperformed using the 176 {pb$^{-1}$ of data collected at 189 {Ge\kern -0.1em V} in 1998 with the L3detector. Mass differences between the chargino and the lightest supersymmetric particlebelow 4 {Ge\kern -0.1em V} are considered.The presence of a high transverse momentum photon is required to single out the signal from the photon-photon interaction background. No evidence for charginos is found and upper limits on the cross section for chargino pair production are set. For the first time, in the case ofheavy scalar leptons, chargino mass limits are obtained for any $\tilde{\chi}^{\pm}_1 - \tilde{\chi}^0_1$ mass difference.
Document type :
Journal articles

Cited literature [21 references]

http://hal.in2p3.fr/in2p3-00009700
Contributor : Sylvie Flores <>
Submitted on : Monday, June 19, 2000 - 11:30:09 AM
Last modification on : Friday, December 4, 2020 - 1:22:16 PM
Long-term archiving on: : Monday, June 21, 2010 - 5:01:29 PM

### Identifiers

• HAL Id : in2p3-00009700, version 1

### Citation

M. Acciarri, P. Achard, O. Adriani, M. Aguilar-Benitez, J. Alcaraz, et al.. Search for charginos with a small mass difference to the lightest supersymmetric particle at $\sqrt{s}$ = 189 GeV. Physics Letters B, Elsevier, 2000, 482, pp.31-42. ⟨in2p3-00009700⟩

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