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Leif Jönsson

Leif Jönsson

Professor emeritus

Leif Jönsson

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

Author

  • F. D. Aaron
  • C. Alexa
  • V. Andreev
  • B. Antunovic
  • S. Aplin
  • A. Asmone
  • A. Astvatsatourov
  • A. Bacchetta
  • S. Backovic
  • A. Baghdasaryan
  • P. Baranov
  • E. Barrelet
  • W. Bartel
  • M. Beckingham
  • K. Begzsuren
  • O. Behnke
  • A. Belousov
  • N. Berger
  • J. C. Bizot
  • M. -O. Boenig
  • V. Boudry
  • I. Bozovic-Jelisavcic
  • J. Bracinik
  • G. Brandt
  • M. Brinkmann
  • V. Brisson
  • D. Bruncko
  • A. Bunyatyan
  • G. Buschhorn
  • L. Bystritskaya
  • A. J. Campbell
  • K. B. Cantun Avila
  • F. Cassol-Brunner
  • K. Cerny
  • V. Cerny
  • V. Chekelian
  • A. Cholewa
  • J. G. Contreras
  • J. A. Coughlan
  • G. Cozzika
  • J. Cvach
  • J. B. Dainton
  • K. Daum
  • M. Deak
  • Y. de Boer
  • B. Delcourt
  • M. Del Degan
  • J. Delvax
  • A. De Roeck
  • E. A. De Wolf
  • C. Diaconu
  • V. Dodonov
  • A. Dossanov
  • A. Dubak
  • G. Eckerlin
  • V. Efremenko
  • S. Egli
  • A. Eliseev
  • E. Elsen
  • S. Essenov
  • A. Falkiewicz
  • P. J. W. Faulkner
  • L. Favart
  • A. Fedotov
  • R. Felst
  • J. Feltesse
  • J. Ferencei
  • M. Fleischer
  • A. Fomenko
  • E. Gabathuler
  • J. Gayler
  • S. Ghazaryan
  • A. Glazov
  • I. Glushkov
  • L. Goerlich
  • M. Goettlich
  • N. Gogitidze
  • M. Gouzevitch
  • C. Grab
  • T. Greenshaw
  • B. R. Grell
  • G. Grindhammer
  • S. Habib
  • D. Haidt
  • Magnus Hansson
  • C. Helebrant
  • R. C. W. Henderson
  • E. Hennekemper
  • H. Henschel
  • G. Herrera
  • M. Hildebrandt
  • K. H. Hiller
  • D. Hoffmann
  • R. Horisberger
  • A. Hovhannisyan
  • T. Hreus
  • M. Jacquet
  • M. E. Janssen
  • X. Janssen
  • V. Jemanov
  • Leif Jönsson
  • D. P. Johnson
  • A. W. Jung
  • H. Jung
  • M. Kapichine
  • J. Katzy
  • I. R. Kenyon
  • C. Kiesling
  • M. Klein
  • C. Kleinwort
  • T. Klimkovich
  • T. Kluge
  • A. Knutsson
  • R. Kogler
  • V. Korbel
  • P. Kostka
  • M. Kraemer
  • K. Krastev
  • J. Kretzschmar
  • A. Kropivnitskaya
  • K. Krueger
  • K. Kutak
  • M. P. J. Landon
  • W. Lange
  • G. Lastovicka-Medin
  • P. Laycock
  • A. Lebedev
  • G. Leibenguth
  • V. Lendermann
  • S. Levonian
  • G. Li
  • K. Lipka
  • A. Liptaj
  • B. List
  • J. List
  • N. Loktionova
  • R. Lopez-Fernandez
  • V. Lubimov
  • A. -I. Lucaci-Timoce
  • L. Lytkin
  • A. Makankine
  • E. Malinovski
  • P. Marage
  • Ll. Marti
  • H. -U. Martyn
  • S. J. Maxfield
  • A. Mehta
  • K. Meier
  • A. B. Meyer
  • H. Meyer
  • H. Meyer
  • J. Meyer
  • V. Michels
  • S. Mikocki
  • I. Milcewicz-Mika
  • F. Moreau
  • A. Morozov
  • J. V. Morris
  • M. U. Mozer
  • M. Mudrinic
  • K. Mueller
  • P. Murin
  • K. Nankov
  • B. Naroska
  • Th. Naumann
  • P. R. Newman
  • C. Niebuhr
  • A. Nikiforov
  • G. Nowak
  • K. Nowak
  • M. Nozicka
  • B. Olivier
  • J. E. Olsson
  • Sakar Osman
  • D. Ozerov
  • V. Palichik
  • I. Panagoulias
  • M. Pandurovic
  • Th. Papadopoulou
  • C. Pascaud
  • G. D. Patel
  • O. Pejchal
  • H. Peng
  • E. Perez
  • A. Petrukhin
  • I. Picuric
  • S. Piec
  • D. Pitzl
  • R. Placakyte
  • R. Polifka
  • B. Povh
  • T. Preda
  • V. Radescu
  • A. J. Rahmat
  • N. Raicevic
  • A. Raspiareza
  • T. Ravdandorj
  • P. Reimer
  • E. Rizvi
  • P. Robmann
  • B. Roland
  • R. Roosen
  • A. Rostovtsev
  • M. Rotaru
  • J. E. Ruiz Tabasco
  • Z. Rurikova
  • S. Rusakov
  • D. Salek
  • F. Salvaire
  • D. P. C. Sankey
  • M. Sauter
  • E. Sauvan
  • S. Schmidt
  • S. Schmitt
  • C. Schmitz
  • L. Schoeffel
  • A. Schoening
  • H. -C. Schultz-Coulon
  • F. Sefkow
  • R. N. Shaw-West
  • I. Sheviakov
  • L. N. Shtarkov
  • S. Shushkevich
  • T. Sloan
  • I. Smiljanic
  • P. Smirnov
  • Y. Soloviev
  • P. Sopicki
  • D. South
  • V. Spaskov
  • A. Specka
  • Z. Staykova
  • M. Steder
  • B. Stella
  • U. Straumann
  • D. Sunar
  • T. Sykora
  • V. Tchoulakov
  • G. Thompson
  • P. D. Thompson
  • T. Toll
  • F. Tomasz
  • T. H. Tran
  • D. Traynor
  • T. N. Trinh
  • P. Truoel
  • I. Tsakov
  • B. Tseepeldorj
  • I. Tsurin
  • J. Turnau
  • E. Tzamariudaki
  • K. Urban
  • A. Valkarova
  • C. Vallee
  • P. Van Mechelen
  • A. Vargas Trevino
  • Y. Vazdik
  • S. Vinokurova
  • V. Volchinski
  • D. Wegener
  • M. Wessels
  • Ch. Wissing
  • E. Wuensch
  • V. Yeganov
  • J. Zacek
  • J. Zalesak
  • Z. Zhang
  • A. Zhelezov
  • A. Zhokin
  • Y. C. Zhu
  • T. Zimmermann
  • H. Zohrabyan
  • F. Zomer

Summary, in English

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.

Department/s

  • Particle and nuclear physics

Publishing year

2008

Language

English

Pages

268-276

Publication/Series

Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics

Volume

668

Issue

4

Document type

Journal article

Publisher

Elsevier

Topic

  • Subatomic Physics

Status

Published

ISBN/ISSN/Other

  • ISSN: 0370-2693