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University of Illinois, Urbana, Illinois 61801, USA.
Phys Rev Lett. 2007 Mar 30;98(13):131804. doi: 10.1103/PhysRevLett.98.131804.
We report a search for the anomalous production of events with multiple charged leptons in pp[over] collisions at sqrt[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 > or =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 (chiover(0)) and chargino (chiover particles. For one particular choice of model parameters, the limits are M(chiover(0)>110 GeV/c2 and M(chiover>203 GeV/c2 at 95% confidence level; the variation of these mass limits with model parameters is presented.
