Search for Exclusive Gamma Gamma Production in Hadron-Hadron Collisions

Understand

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.