Search for Exclusive Gamma Gamma Production in Hadron-Hadron Collisions

Details Search for Exclusive Gamma Gamma Production in Hadron-Hadron Collisions Search for Exclusive Gamma Gamma Production in Hadron-Hadron Collisions

2007-07-16

arxiv.org/abs/0707.2374v2

Phys.Rev.Lett.99:242002,2007

Physics

High Energy Physics

High Energy Physics - Experiment

7 pages, 2 figures. Submitted to Phys.Rev.Lett

Scientific paper

10.1103/PhysRevLett.99.242002

We have searched for exclusive 2-photon production in proton-antiproton collisions at sqrt{s} = 1.96 TeV, using 532/pb of integrated luminosity taken by the Run II Collider Detector at Fermilab. The event signature requires two electromagnetic showers, each with transverse energy E_T > 5 GeV and pseudorapidity |eta|<1.0, with no other particles detected in the event. Three candidate events are observed. We discuss the consistency of the three events with gamma-gamma, pi0-pi0, or eta-eta production. The probability that other processes fluctuate to 3 events or more is 1.7x10^-4. An upper limit on the cross section of p+pbar --> p+gamma-gamma+pbar is set at 410 fb with 95% confidence level.

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