We present the results of the first hadron collider search for heavy, long-lived neutralinos that decay via chi over tilde (0)(1)->gamma G over tilde in gauge-mediated supersymmetry breaking models. Using an integrated luminosity of 570 +/- 34 pb(-1) of p (p) over bar collisions at root s=1.96 TeV, we select gamma+jet+missing transverse energy candidate events based on the arrival time of a high-energy photon at the electromagnetic calorimeter as measured with a timing system that was recently installed on the CDF II detector. We find 2 events, consistent with the background estimate of 1.3 +/- 0.7 events. While our search strategy does not rely on model-specific dynamics, we set cross section limits and place the world-best 95% C.L. lower limit on the chi overtilde (0)(1) mass of 101 GeV/c(2) at tau((chi) overtilde (0)(1))=5 ns.
Search for heavy, long-lived neutralinos that decay to photons at CDF II using photon timing
CIOCCI, MARIA AGNESE;DONATI, SIMONE;PUNZI, GIOVANNI;
2008-01-01
Abstract
We present the results of the first hadron collider search for heavy, long-lived neutralinos that decay via chi over tilde (0)(1)->gamma G over tilde in gauge-mediated supersymmetry breaking models. Using an integrated luminosity of 570 +/- 34 pb(-1) of p (p) over bar collisions at root s=1.96 TeV, we select gamma+jet+missing transverse energy candidate events based on the arrival time of a high-energy photon at the electromagnetic calorimeter as measured with a timing system that was recently installed on the CDF II detector. We find 2 events, consistent with the background estimate of 1.3 +/- 0.7 events. While our search strategy does not rely on model-specific dynamics, we set cross section limits and place the world-best 95% C.L. lower limit on the chi overtilde (0)(1) mass of 101 GeV/c(2) at tau((chi) overtilde (0)(1))=5 ns.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.