| In searches for SUSY in all-hadronic channels, events with jets and a Z boson form an irreducible background when the PZ boson decays to a pair of neutrinos. For R-parity conserving susy models, every decay chain involving a superparticle must result in at least one gls{lsp}, which can be neutral and noninteracting. The detector signature for the gls{lsp} is identical to that of the two neutrinos from the PZ, which appear as an imbalance in the transverse momentum of the event. The characterization of these types of events is crucially important in any search for new physics performed in a multi-jets+missing transverse momentum channel. A method for estimating this irreducible background using events with a measured photon is presented, and the results for a search performed in the all-hadronic multi-jet channel are shown to be consistent with standard model expectations. Limits are set on the mass of expected new particles in various models. |
