Journal
PHYSICAL REVIEW LETTERS
Volume 99, Issue 24, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.99.242002
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Funding
- Science and Technology Facilities Council [PP/E000444/1, PPA/A/S/2003/00461/2, PP/E000452/1] Funding Source: researchfish
- STFC [PP/E000452/1] Funding Source: UKRI
- National Research Foundation of Korea [과06B1110, 2007-532-C00005] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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We have searched for exclusive gamma gamma production in proton-antiproton collisions at root s = 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 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, pi(0)pi(0), or eta eta production. The probability that other processes fluctuate to >= 3 events is 1.7x10(-4). An upper limit on the cross section of p (p) over bar -> p + gamma gamma + (p) over bar production is set at 410 fb with 95% confidence level.
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