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Multi-leptons with high transverse momentum at HERA


H1 and ZEUS Collaborations; Aaron, F D; Abramovicz, H; Abt, I; Adamczyk, L; Adamus, M; Müller, K; Nowak, K; Robmann, P; Straumann, U; Truöl, P (2009). Multi-leptons with high transverse momentum at HERA. Journal of High Energy Physics, (10):013.

Abstract

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.

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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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:5 October 2009
Deposited On:18 Nov 2009 12:54
Last Modified:18 May 2016 20:57
Publisher:Institute of Physics Publishing
ISSN:1029-8479
Publisher DOI:10.1088/1126-6708/2009/10/013
Related URLs:http://arxiv.org/abs/0907.3627v2
Permanent URL: http://doi.org/10.5167/uzh-23745

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