Abstract
A search for gaugino pair production with a trilepton signature in the framework of R -parity violating supersymmetry via the couplings λ 121 , λ 122 , or λ 133 is presented. The data, corresponding to an integrated luminosity of L ≈ 360 pb −1 , were collected from April 2002 to August 2004 with the D∅ detector at the Fermilab Tevatron Collider, at a center-of-mass energy of s = 1.96 TeV . This analysis considers final states with three charged leptons with the flavor combinations eeℓ , μμℓ , and eeτ ( ℓ = e or μ ). No evidence for supersymmetry is found and limits at the 95% confidence level are set on the gaugino pair production cross section and lower bounds on the masses of the lightest neutralino and chargino are derived in two supersymmetric models.
Highlights
Supersymmetry (SUSY) [1] predicts the existence of a new particle for each standard model (SM) particle, differing by half a unit in spin but otherwise sharing the same quantum numbers
Terms appearing in the first line of Eq (1) violate lepton number by one unit, and the last term in the second line leads to baryon number violation
This Letter reports on a search for chargino and neutralino pair production under the hypothesis that R/ p can only occur via a term of the type λijkLiLj Ek
Summary
Supersymmetry (SUSY) [1] predicts the existence of a new particle for each standard model (SM) particle, differing by half a unit in spin but otherwise sharing the same quantum numbers. Dielectron and dimuon backgrounds from Drell–Yan, Υ , and Z boson production are suppressed using cuts on E/ T and on the invariant dilepton mass M (for the μμ and eeτ analyses).
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