Tuesday, October 4, 2011
340 West Hall Note: Date Change
Speaker: Eva Halkiadakis (Rutgers University, CMS Searches)Most searches for new physics at high energy hadron colliders use signatures that require leptons, photons, or missing transverse energy in order to suppress backgrounds from QCD. I will present two searches for new physics in an entirely hadronic channel with no MET signature using data collected with the CDF detector at Fermilab and the CMS detector at CERN. They represent the first dedicated model independent searches for three-jet hadronic resonances in a multijet environment. These searches utilizes a novel approach: an ensemble of all possible jet triplets within an event consisting of at least six jets is used to extract a signal from the multijet QCD backgrounds. In both analyses, the number of expected standard model background events is found to be in good agreement with the observed events. Limits on the cross section times branching ratio are set in a model of gluino pair production with an R-parity-violating decay to three quarks.