Multi-lepton production at high transverse momenta in ep collisions at HERA

Aaron, F. D., Alexa, C., Andreev, V., Antunovic, B., Aplin, S., Asmone, A., Astvatsatourov, A., Bacchetta, A., Backovic, S., Baghdasaryan, A., Baranov, P., Barrelet, E., Bartel, W., Beckingham, M., Begzsuren, K., Behnke, O., Belousov, A., Berger, N., Bizot, J. C., Li, G. and H1 Collaboration 2008, Multi-lepton production at high transverse momenta in ep collisions at HERA, Physics letters, section b, vol. 668, no. 4, pp. 268-276, doi: 10.1016/j.physletb.2008.08.057.

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Title Multi-lepton production at high transverse momenta in ep collisions at HERA
Author(s) Aaron, F. D.
Alexa, C.
Andreev, V.
Antunovic, B.
Aplin, S.
Asmone, A.
Astvatsatourov, A.
Bacchetta, A.
Backovic, S.
Baghdasaryan, A.
Baranov, P.
Barrelet, E.
Bartel, W.
Beckingham, M.
Begzsuren, K.
Behnke, O.
Belousov, A.
Berger, N.
Bizot, J. C.
Li, G.ORCID iD for Li, G. orcid.org/0000-0003-1583-641X
H1 Collaboration
Journal name Physics letters, section b
Volume number 668
Issue number 4
Start page 268
End page 276
Total pages 9
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2008-10-16
ISSN 0370-2693
Summary Processes leading to a final state with at least two high transverse momentum leptons (electrons or muons) are studied using the full e ± p data sample collected by the H1 experiment at HERA. The data correspond to an integrated luminosity of 463 pb -1. Di-lepton and tri-lepton event classes are investigated. Cross sections of the production of e + e - and μ + μ - pairs are derived in a restricted phase space dominated by photon-photon collisions. In general, good agreement is found with Standard Model predictions. Events are observed with a total scalar sum of lepton transverse momenta above 100   GeV where the Standard Model expectation is low. In this region, combining di-lepton and tri-lepton classes, five events are observed in e + p collisions, compared to a Standard Model expectation of 0.96 ± 0.12, while no such event is observed in e - p data for 0.64 ± 0.09 expected. © 2008 Elsevier B.V. All rights reserved.
Language eng
DOI 10.1016/j.physletb.2008.08.057
Indigenous content off
Field of Research 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2008, Elsevier B.V.
Persistent URL http://hdl.handle.net/10536/DRO/DU:30125542

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