We have searched for exclusive gammagamma production in proton-antiproton collisions at sqrt[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 gammagamma, pi;{0}pi;{0}, or etaeta production. The probability that other processes fluctuate to >/=3 events is 1.7x10;{-4}. An upper limit on the cross section of pp[over ]-->p+gammagamma+p[over ] production is set at 410 fb with 95% confidence level.
Search for Exclusive gammagamma Production in Hadron-Hadron Collisions. Publishing Authors By Initials
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PUBLICATION TYPE: Journal Article
Journal: Physical review letters
VOLUME: 99
Page Numbers: 242002
Journal Abbreviation: Phys. Rev. Lett.
ISSN: 0031-9007
DAY: 14
MONTH: 12
YEAR: 2007
Search for Exclusive gammagamma Production in Hadron-Hadron Collisions. Information
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LANGUAGE: eng
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AFFILIATION: Division of High Energy Physics, Department of Physics, University of Helsinki and Helsinki Institute of Physics, FIN-00014, Helsinki, Finland.
Country: United States
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MEDLINETA: Phys Rev Lett
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