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Observation of Exclusive γγ Production in pp̅ Collisions at √s=1.96  TeV

Author(s)
Gomez-Ceballos, Guillelmo; Goncharov, Maxim; Paus, Christoph M. E.
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Abstract
We have observed exclusive γγ production in proton-antiproton collisions at √s=1.96  TeV, using data from 1.11±0.07  fb[superscript -1] integrated luminosity taken by the Run II Collider Detector at Fermilab. We selected events with two electromagnetic showers, each with transverse energy ET>2.5  GeV and pseudorapidity |η|<1.0, with no other particles detected in -7.4<η<+7.4. The two showers have similar ET and azimuthal angle separation ΔΦ ~π, 34 events have two charged particle tracks, consistent with the QED process pp̅ →p+e[superscript +]e[superscript -]p̅ by two-photon exchange, while 43 events have no charged tracks. The number of these events that are exclusive π[superscript 0]π[superscript 0] is consistent with zero and is <15 at 95% C.L. The cross section for pp̅ →p+γγ+p̅ with |η(γ)|<1.0 and ET(γ)>2.5  GeV is 2.48-0.35[superscript +0.40](stat)-0.51[superscript +0.40 (syst)  pb.
Date issued
2012-02
URI
http://hdl.handle.net/1721.1/71543
Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Aaltonen et al. (CDF Collaboration) "Observation of Exclusive γγ Production in pp̅ Collisions at √s=1.96  TeV" Physical Review Letters 108, 081801 (2012). © 2012 American Physical Society
Version: Final published version
ISSN
0031-9007
1079-7114

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