We report a search for the anomalous production of events with multiple charged leptons in p (p) over bar collisions at root s = 1.96 TeV using a data sample corresponding to an integrated luminosity of 346 pb(-1) collected by the CDF II detector at the Fermilab Tevatron. The search is divided into three-lepton and four-or-more-lepton data samples. We observe six events in the three-lepton sample and zero events in the >= 4-lepton sample. Both numbers of events are consistent with standard model background expectations. Within the framework of an R-parity-violating supergravity model, the results are interpreted as mass limits on the lightest neutralino (chi(0)(1)) and chargino (chi(+/-)(1)) particles. For one particular choice of model parameters, the limits are M(chi(0)(1))> 110 GeV/c(2) and M(chi(+/-)(1))> 203 GeV/c(2) at 95% confidence level; the variation of these mass limits with model parameters is presented.

Search for anomalous production of multilepton events in p-pbar collisions at root s=1.96 TeV

CAUZ, Diego;GIORDANI, Mario;SANTI, Lorenzo Gianni;
2007

Abstract

We report a search for the anomalous production of events with multiple charged leptons in p (p) over bar collisions at root s = 1.96 TeV using a data sample corresponding to an integrated luminosity of 346 pb(-1) collected by the CDF II detector at the Fermilab Tevatron. The search is divided into three-lepton and four-or-more-lepton data samples. We observe six events in the three-lepton sample and zero events in the >= 4-lepton sample. Both numbers of events are consistent with standard model background expectations. Within the framework of an R-parity-violating supergravity model, the results are interpreted as mass limits on the lightest neutralino (chi(0)(1)) and chargino (chi(+/-)(1)) particles. For one particular choice of model parameters, the limits are M(chi(0)(1))> 110 GeV/c(2) and M(chi(+/-)(1))> 203 GeV/c(2) at 95% confidence level; the variation of these mass limits with model parameters is presented.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11390/879875
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