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We present the first signature-based search for delayed photons using anexclusive photon plus missing transverse energy final state. Events arereconstructed in a data sample from the CDF II detector corresponding to $6.3\text{fb}^{-1}$ of integrated luminosity from $\sqrt{s}=1.96$ TeVproton-antiproton collisions. Candidate events are selected if they contain aphoton with an arrival time in the detector larger than expected from apromptly-produced photon. The mean number of events from standard model sourcespredicted by the data-driven background model based on the photon timingdistribution is $286 \pm 24$. A total of 322 events are observed. A $p$-valueof 12% is obtained, showing consistency of the data with standard modelpredictions.

physical review. d. particles, fields, gravitation, and cosmology/physical review. d, particles, fields, gravitation, and cosmology

A signature-based search for delayed photons in exclusive photon plus  missing transverse energy events from $p \bar{p}$ collisions with $\sqrt{s} =  1.96$ TeV