Search for the Trilepton Signal of the Minimal Supergravity Model in D0 Run II
- Munich Univ. (Germany)
A search for associated chargino neutralino pair production is performed in the trilepton decay channel q$$\bar{q}$$ → $$\tilde{Χ}$$$$±\atop{1}$$ $$\tilde{Χ}$$$$0\atop{2}$$ → ℓ± v $$\tilde{Χ}$$$$0\atop{1}$$ μ± μ± $$\tilde{Χ}$$$$0\atop{1}$$, using data collected with the D0 detector at a center-of-mass energy of 1.96 TeV at the Fermilab Tevatron Collider. The data sample corresponds to an integrated luminosity of ~300 pb-1. A dedicated event selection is applied to all samples including the data sample and the Monte Carlo simulated samples for the Standard Model background and the Supersymmetry signal. Events with two muons plus an additional isolated track, replacing the requirement of a third charged lepton in the event, are analyzed. Additionally, selected events must have a large amount of missing transverse energy due to the neutrino and the two $$\tilde{Χ}$$$$0\atop{1}$$. After all selection cuts are applied, 2 data events are found, with an expected number of background events of 1.75 ± 0.34 (stat.) ± 0.46 (syst.). No evidence for Supersymmetry is found and limits on the production cross section times leptonic branching fraction are set. When the presented analysis is considered in combination with three other decay channels, no evidence for Supersymmetry is found. Limits on the production cross section times leptonic branching fraction are set. A lower chargino mass limit of 117 GeV at 95% CL is then derived for the mSUGRA model in a region of parameter space with enhanced leptonic branching fractions.
- Research Organization:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC02-76CH03000
- OSTI ID:
- 15020393
- Report Number(s):
- FERMILAB-THESIS-2005-30; TRN: US0605032
- Country of Publication:
- United States
- Language:
- English
Similar Records
A search for chargino-neutralino production at the Fermilab Tevatron Collider
Trileptons from chargino-neutralino production at the CERN Large Hadron Collider