Search for supersymmetry using diphoton events in proton-antiproton collisions at a center of mass energy of 1.96 TeV.

摘要

This dissertation presents the results of a search for supersymmetry in proton-antiproton collisions with a center of mass energy of 1.96 TeV studied with the Collider Detector at Fermilab. Our strategy is to select collisions with two photons in the final state that have the properties of being the decays of very massive supersymmetric particles. This includes looking for large total energy from the decayed particles as well as for the presence of particles that leave the detector without interacting. We find no events using 2.6 fb-1 of data collected during the 2004--2008 collider run of the Fermilab Tevatron which is consistent with the background estimate of 1.4+/-0.4 events. Since there is no evidence of new particles we set cross section limits in a gauge-mediated supersymmetry model with X&d5;01 → gammaG˜, where the X&d5;01 and G˜ are the lightest neutralino and the gravitino (the lightest supersymmetric particle), respectively. We set limits on models as a function of the X&d5;01 mass and lifetime, producing the world's most sensitive search for X&d5;01 by excluding masses up to 149 GeV/c2 for X&d5;01 lifetimes much less than 1 ns.