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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. and Baghdasaryan, A., et al. (2008) In Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics 668(4). p.268-276
Abstract
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 mu(+)mu(-) 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... (More)
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 mu(+)mu(-) 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. (C) 2008 Elsevier B.V. All rights reserved. (Less)
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Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics
volume
668
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4
pages
268 - 276
publisher
Elsevier
external identifiers
  • wos:000260480300004
  • scopus:73849085670
ISSN
0370-2693
DOI
10.1016/j.physletb.2008.08.057
language
English
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85144520-e78c-43e1-95bb-740c5d82399e (old id 1279528)
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2009-02-10 13:12:28
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@article{85144520-e78c-43e1-95bb-740c5d82399e,
  abstract     = {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 mu(+)mu(-) 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. (C) 2008 Elsevier B.V. All rights reserved.},
  author       = {Aaron, F. D. and Alexa, C. and Andreev, V. and Antunovic, B. and Aplin, S. and Asmone, A. and Astvatsatourov, A. and Bacchetta, A. and Backovic, S. and Baghdasaryan, A. and Baranov, P. and Barrelet, E. and Bartel, W. and Beckingham, M. and Begzsuren, K. and Behnke, O. and Belousov, A. and Berger, N. and Bizot, J. C. and Boenig, M. -O. and Boudry, V. and Bozovic-Jelisavcic, I. and Bracinik, J. and Brandt, G. and Brinkmann, M. and Brisson, V. and Bruncko, D. and Bunyatyan, A. and Buschhorn, G. and Bystritskaya, L. and Campbell, A. J. and Avila, K. B. Cantun and Cassol-Brunner, F. and Cerny, K. and Cerny, V. and Chekelian, V. and Cholewa, A. and Contreras, J. G. and Coughlan, J. A. and Cozzika, G. and Cvach, J. and Dainton, J. B. and Daum, K. and Deak, M. and de Boer, Y. and Delcourt, B. and Del Degan, M. and Delvax, J. and De Roeck, A. and De Wolf, E. A. and Diaconu, C. and Dodonov, V. and Dossanov, A. and Dubak, A. and Eckerlin, G. and Efremenko, V. and Egli, S. and Eliseev, A. and Elsen, E. and Essenov, S. and Falkiewicz, A. and Faulkner, P. J. W. and Favart, L. and Fedotov, A. and Felst, R. and Feltesse, J. and Ferencei, J. and Fleischer, M. and Fomenko, A. and Gabathuler, E. and Gayler, J. and Ghazaryan, S. and Glazov, A. and Glushkov, I. and Goerlich, L. and Goettlich, M. and Gogitidze, N. and Gouzevitch, M. and Grab, C. and Greenshaw, T. and Grell, B. R. and Grindhammer, G. and Habib, S. and Haidt, D. and Hansson, Magnus and Helebrant, C. and Henderson, R. C. W. and Hennekemper, E. and Henschel, H. and Herrera, G. and Hildebrandt, M. and Hiller, K. H. and Hoffmann, D. and Horisberger, R. and Hovhannisyan, A. and Hreus, T. and Jacquet, M. and Janssen, M. E. and Janssen, X. and Jemanov, V. and Jönsson, Leif and Johnson, D. P. and Jung, A. W. and Jung, H. and Kapichine, M. and Katzy, J. and Kenyon, I. R. and Kiesling, C. and Klein, M. and Kleinwort, C. and Klimkovich, T. and Kluge, T. and Knutsson, A. and Kogler, R. and Korbel, V. and Kostka, P. and Kraemer, M. and Krastev, K. and Kretzschmar, J. and Kropivnitskaya, A. and Krueger, K. and Kutak, K. and Landon, M. P. J. and Lange, W. and Lastovicka-Medin, G. and Laycock, P. and Lebedev, A. and Leibenguth, G. and Lendermann, V. and Levonian, S. and Li, G. and Lipka, K. and Liptaj, A. and List, B. and List, J. and Loktionova, N. and Lopez-Fernandez, R. and Lubimov, V. and Lucaci-Timoce, A. -I. and Lytkin, L. and Makankine, A. and Malinovski, E. and Marage, P. and Marti, Ll. and Martyn, H. -U. and Maxfield, S. J. and Mehta, A. and Meier, K. and Meyer, A. B. and Meyer, H. and Meyer, H. and Meyer, J. and Michels, V. and Mikocki, S. and Milcewicz-Mika, I. and Moreau, F. and Morozov, A. and Morris, J. V. and Mozer, M. U. and Mudrinic, M. and Mueller, K. and Murin, P. and Nankov, K. and Naroska, B. and Naumann, Th. and Newman, P. R. and Niebuhr, C. and Nikiforov, A. and Nowak, G. and Nowak, K. and Nozicka, M. and Olivier, B. and Olsson, J. E. and Osman, Sakar and Ozerov, D. and Palichik, V. and Panagoulias, I. and Pandurovic, M. and Papadopoulou, Th. and Pascaud, C. and Patel, G. D. and Pejchal, O. and Peng, H. and Perez, E. and Petrukhin, A. and Picuric, I. and Piec, S. and Pitzl, D. and Placakyte, R. and Polifka, R. and Povh, B. and Preda, T. and Radescu, V. and Rahmat, A. J. and Raicevic, N. and Raspiareza, A. and Ravdandorj, T. and Reimer, P. and Rizvi, E. and Robmann, P. and Roland, B. and Roosen, R. and Rostovtsev, A. and Rotaru, M. and Tabasco, J. E. Ruiz and Rurikova, Z. and Rusakov, S. and Salek, D. and Salvaire, F. and Sankey, D. P. C. and Sauter, M. and Sauvan, E. and Schmidt, S. and Schmitt, S. and Schmitz, C. and Schoeffel, L. and Schoening, A. and Schultz-Coulon, H. -C. and Sefkow, F. and Shaw-West, R. N. and Sheviakov, I. and Shtarkov, L. N. and Shushkevich, S. and Sloan, T. and Smiljanic, I. and Smirnov, P. and Soloviev, Y. and Sopicki, P. and South, D. and Spaskov, V. and Specka, A. and Staykova, Z. and Steder, M. and Stella, B. and Straumann, U. and Sunar, D. and Sykora, T. and Tchoulakov, V. and Thompson, G. and Thompson, P. D. and Toll, T. and Tomasz, F. and Tran, T. H. and Traynor, D. and Trinh, T. N. and Truoel, P. and Tsakov, I. and Tseepeldorj, B. and Tsurin, I. and Turnau, J. and Tzamariudaki, E. and Urban, K. and Valkarova, A. and Vallee, C. and Van Mechelen, P. and Trevino, A. Vargas and Vazdik, Y. and Vinokurova, S. and Volchinski, V. and Wegener, D. and Wessels, M. and Wissing, Ch. and Wuensch, E. and Yeganov, V. and Zacek, J. and Zalesak, J. and Zhang, Z. and Zhelezov, A. and Zhokin, A. and Zhu, Y. C. and Zimmermann, T. and Zohrabyan, H. and Zomer, F.},
  issn         = {0370-2693},
  language     = {eng},
  number       = {4},
  pages        = {268--276},
  publisher    = {Elsevier},
  series       = {Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics},
  title        = {Multi-lepton production at high transverse momenta in ep collisions at HERA},
  url          = {http://dx.doi.org/10.1016/j.physletb.2008.08.057},
  volume       = {668},
  year         = {2008},
}