We present the first signature-based search for delayed photons using an exclusive photon plus missing transverse energy final state. Events are reconstructed in a data sample from the CDF II detector corresponding to 6.3 fb(-1) of integrated luminosity from root s = 1.96 TeV proton-antiproton collisions. Candidate events are selected if they contain a photon with an arrival time in the detector larger than expected from a promptly produced photon. The mean number of events from standard model sources predicted by the data-driven background model based on the photon timing distribution is 286 +/- 24. A total of 322 events are observed. A p value of 12% is obtained, showing consistency of the data with standard model predictions.
Signature-based search for delayed photons in exclusive photon plus missing transverse energy events from p pbar collisions with sqrt(s)=1.96 TeV
CIOCCI, MARIA AGNESE;DONATI, SIMONE;A. Driutti;PUNZI, GIOVANNI;F. Ruffini;
2013-01-01
Abstract
We present the first signature-based search for delayed photons using an exclusive photon plus missing transverse energy final state. Events are reconstructed in a data sample from the CDF II detector corresponding to 6.3 fb(-1) of integrated luminosity from root s = 1.96 TeV proton-antiproton collisions. Candidate events are selected if they contain a photon with an arrival time in the detector larger than expected from a promptly produced photon. The mean number of events from standard model sources predicted by the data-driven background model based on the photon timing distribution is 286 +/- 24. A total of 322 events are observed. A p value of 12% is obtained, showing consistency of the data with standard model predictions.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
