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Title
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Multi-leptons with high transverse momentum at HERA
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Author
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Institution/Organisation
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H1 Collaboration
ZEUS Collaboration
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Abstract
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| Events with at least two high transverse momentum leptons (electrons or muons) are studied using the H1 and ZEUS detectors at HERA with an integrated luminosity of 0.94 fb−1. The observed numbers of events are in general agreement with the Standard Model predictions. Seven di- and tri-lepton events are observed in e+p collision data with a scalar sum of the lepton transverse momenta above 100 GeV while 1.94±0.17 events are expected. Such events are not observed in e−p collisions for which 1.19±0.12 are predicted. Total visible and differential di-electron and di-muon photoproduction cross sections are extracted in a restricted phase space dominated by photon-photon collisions. |
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Language
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English
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Source (journal)
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Journal of high energy physics. - Bristol
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Publication
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Bristol
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2009
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ISSN
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1126-6708
1029-8479
[online]
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DOI
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10.1088/1126-6708/2009/10/013
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Volume/pages
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10
(2009)
, p. 013,1-013,18
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ISI
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000271542800013
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Full text (Publisher's DOI)
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Full text (publisher's version - intranet only)
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