Scholars@Duke publication: Search for anomalous production of multi-lepton events in $p \bar{p}$ collisions at $\sqrt{s}$ = 1.96-TeV

Search for anomalous production of multi-lepton events in $p \bar{p}$ collisions at $\sqrt{s}$ = 1.96-TeV

Publication , Journal Article

Abulencia; A; others

Published in: Phys. Rev. Lett.

2007

We report a search for the anomalous production of events with multiple charged leptons in p[overline p] 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 >=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-tilde10) and chargino (chi-tilde1[plus-minus]) particles. For one particular choice of model parameters, the limits are M(chi-tilde10)>110 GeV/c2 and M(chi-tilde1[plus-minus])>203 GeV/c2 at 95\% confidence level; the variation of these mass limits with model parameters is presented.