We have searched for exclusive gamma gamma production in
proton-antiproton collisions at s**(1/2) = 1.96 TeV, using 532 pb-1 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 pseudorapi+dity |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, pi+0 pi+0, or eta eta production. The probability that other
processes fluctuate to > 3 events is 1.7 x 10-4. An upper limit on
the cross section of p anti-p --> p + gamma gamma + p anti-production
is set at 410 fb with 95% confidence level.
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Updated: Tuesday, 2008 January 15 15:15:41 CST automatically from input from carol picciolo