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.
2008
T., Aaltonen; J., Adelman; T., Akimoto; M. G., Albrow; B. A., Gonzalez; S., Amerio; D., Amidei; A., Anastassov; A., Annovi; J., Antos; G., Apollinari;...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/828571
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