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Title
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Observation of exclusive electron-positron production in hadron-hadron collisions
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Author
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Institution/Organisation
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CDF Collaboration
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Abstract
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| We present the first observation of exclusive e+e- production in hadron-hadron collisions, using pp̅ collision data at √s=1.96 TeV taken by the run II Collider Detector at Fermilab, and corresponding to an integrated luminosity of 532 pb-1. We require the absence of any particle signatures in the detector except for an electron and a positron candidate, each with transverse energy ET>5 GeV and pseudorapidity |η|<2. With these criteria, 16 events are observed compared to a background expectation of 1.9±0.3 events. These events are consistent in cross section and properties with the QED process pp̅ →p+e+e-+p̅ through two-photon exchange. The measured cross section is 1.6-0.3+0.5(stat)±0.3(syst) pb. This agrees with the theoretical prediction of 1.71±0.01 pb. |
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Language
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English
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Source (journal)
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Physical review letters. - New York, N.Y., 1958, currens
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Publication
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New York, N.Y.
:
American Physical Society
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2007
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ISSN
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0031-9007
[print]
1079-7114
[online]
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Volume/pages
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98
:11
(2007)
, p. 112001,1-112001,7
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ISI
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000244959300019
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Full text (Publisher's DOI)
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Full text (open access)
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