Signature-based search for delayed photons in exclusive photon plus missing transverse energy events from pp¯ collisions with s=1.96 TeV
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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 √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. © 2013 American Physical Society.
author list (cited authors)
Aaltonen, T., Amerio, S., Amidei, D., Anastassov, A., Annovi, A., Antos, J., ... Zucchelli, S.