We present the first search for heavy, long-lived particles that decay to photons at a hadron collider. We use a sample of gamma+jet+missing transverse energy events in p (p) over bar collisions at root s=1.96 TeV taken with the CDF II detector. Candidate events are selected based on the arrival time of the photon at the detector. Using an integrated luminosity of 570 pb(-1) of collision data, we observe 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 in a supersymmetric model with (chi) over tilde (0)(1)->gamma (G) over tilde and place the world-best 95% C.L. lower limit on the (chi) over tilde (0)(1) mass of 101 GeV/c(2) at tau((chi) over tilde (0)(1))=5 ns.

Search for heavy long-lived particles that decay to photons at CDF II

CIOCCI, MARIA AGNESE;DONATI, SIMONE;G. Punzi;
2007-01-01

Abstract

We present the first search for heavy, long-lived particles that decay to photons at a hadron collider. We use a sample of gamma+jet+missing transverse energy events in p (p) over bar collisions at root s=1.96 TeV taken with the CDF II detector. Candidate events are selected based on the arrival time of the photon at the detector. Using an integrated luminosity of 570 pb(-1) of collision data, we observe 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 in a supersymmetric model with (chi) over tilde (0)(1)->gamma (G) over tilde and place the world-best 95% C.L. lower limit on the (chi) over tilde (0)(1) mass of 101 GeV/c(2) at tau((chi) over tilde (0)(1))=5 ns.
2007
Abulencia, A.; Adelman, J.; Affolder, T.; Akimoto, T.; Albrow, M. G.; Amerio, S.; Amidei, D.; Anastassov, A.; Anikeev, K.; Annovi, A.; Antos, J.; Aoki...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/828925
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