Isolated electrons and muons in events with missing transverse momentum at HERA

Research output: Contribution to journalArticle

Abstract

A search for events with a high-energy isolated electron or muon and missing transverse momentum has been performed at the electron-proton collider HERA using an integrated luminosity of 13.6 pb(-1) in e(-) p scattering and 104.7 pb(-1) in e(+) p scattering. Within the Standard Model such events are expected to be mainly due to W boson production with subsequent leptonic decay. In e(-) p interactions one event is observed in the electron channel and none in the muon channel, consistent with the expectation of the Standard Model. In the e(+) p data a total of 18 events are seen in the electron and muon channels compared to an expectation of 12.4 +/- 1.7 dominated by W production (9.4 +/- 1.6). Whilst the overall observed number of events is broadly in agreement with the number predicted by the Standard Model, there is-an excess of events with transverse momentum of the hadronic system greater than 25 GeV with 10 events found compared to 2.9 +/- 0.5 expected. The results are used to determine the cross-section for events with an isolated electron or muon and missing transverse momentum. (C) 2003 Published by Elsevier Science B.V.

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Authors
  • V Andreev
  • B Andrieu
  • T Anthonis
  • A Astvatsatourov
  • A Babaev
  • J Bahr
  • P Baranov
  • E Barrelet
  • W Bartel
  • S Baumgartner
  • J Becker
  • M Beckingham
  • A Beglarian
  • O Behnke
  • A Belousov
  • C Berger
  • T Berndt
  • JC Bizot
  • J Bohme
  • V Boudry
  • J Bracinik
  • W Braunschweig
  • V Brisson
  • HB Broker
  • DP Brown
  • D Bruncko
  • FW Busser
  • A Bunyatyan
  • A Burrage
  • G Buschhorn
  • L Bystritskaya
  • AJ Campbell
  • S Caron
  • F Cassol-Brunner
  • V Chekelian
  • D Clarke
  • C Collard
  • JG Contreras
  • YR Coppens
  • JA Coughlan
  • MC Cousinou
  • BE Cox
  • G Cozzika
  • J Cvach
  • JB Dainton
  • WD Dau
  • K Daum
  • Mattias Davidsson
  • B Delcourt
  • N Delerue
  • R Demirchyan
  • A De Roeck
  • EA De Wolf
  • C Diaconu
  • J Dingfelder
  • P Dixon
  • V Dodonov
  • JD Dowell
  • A Dubak
  • C Duprel
  • G Eckerlin
  • D Eckstein
  • V Efremenko
  • S Egli
  • R Eichler
  • F Eisele
  • M Ellerbrock
  • E Elsen
  • M Erdmann
  • W Erdmann
  • PJW Faulkner
  • L Favart
  • A Fedotov
  • R Felst
  • J Ferencei
  • S Ferron
  • M Fleischer
  • P Fleischmann
  • YH Fleming
  • G Flucke
  • G Flugge
  • A Fomenko
  • I Foresti
  • J Formanek
  • G Franke
  • G Frising
  • E Gabathuler
  • K Gabathuler
  • J Garvey
  • J Gassner
  • J Gayler
  • R Gerhards
  • C Gerlich
  • S Ghazaryan
  • L Goerlich
  • N Gogitidze
  • S Gorbounov
  • C Grab
  • V Grabski
  • H Grassler
  • T Greenshaw
  • G Grindhammer
  • D Haidt
  • L Hajduk
  • J Haller
  • B Heinemann
  • G Heinzelmann
  • RCW Henderson
  • H Henschel
  • O Henshaw
  • R Heremans
  • G Herrera
  • I Herynek
  • M Hildebrandt
  • M Hilgers
  • KH Hiller
  • J Hladky
  • P Hoting
  • D Hoffmann
  • R Horisberger
  • A Hovhannisyan
  • M Ibbotson
  • C Issever
  • M Jacquet
  • M Jaffre
  • L Janauschek
  • X Janssen
  • V Jemanov
  • C Johnson
  • DP Johnson
  • MAS Jones
  • Hannes Jung
  • D Kant
  • M Kapichine
  • Martin Karlsson
  • O Karschnick
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  • N Keller
  • J Kennedy
  • IR Kenyon
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  • C Kleinwort
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  • G Knies
  • B Koblitz
  • SD Kolya
  • V Korbel
  • P Kostka
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  • A Koutov
  • J Kroseberg
  • K Kruger
  • J Kueckens
  • T Kuhr
  • MPJ Landon
  • W Lange
  • T Lastovicka
  • P Laycock
  • A Lebedev
  • B Leissner
  • R Lemrani
  • V Lendermann
  • S Levonian
  • B List
  • E Lobodzinska
  • B Lobodzinski
  • N Loktionova
  • V Lubimov
  • S Luders
  • D Luke
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  • E Malinovski
  • S Mangano
  • P Marage
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  • R Marshall
  • HU Martyn
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  • SJ Maxfield
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  • H Meyer
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  • D Pitzl
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  • B Povh
  • J Rauschenberger
  • P Reimer
  • B Reisert
  • C Risler
  • E Rizvi
  • P Robmann
  • R Roosen
  • A Rostovtsev
  • S Rusakov
  • K Rybicki
  • DPC Sankey
  • E Sauvan
  • S Schatzel
  • J Scheins
  • FP Schilling
  • P Schleper
  • D Schmidt
  • D Schmidt
  • S Schmidt
  • S Schmitt
  • M Schneider
  • L Schoeffel
  • A Schoning
  • T Schorner-Sadenius
  • V Schroder
  • HC Schultz-Coulon
  • C Schwanenberger
  • K Sedlak
  • F Sefkow
  • I Sheviakov
  • LN Shtarkov
  • Y Sirois
  • T Sloan
  • P Smirnov
  • Y Soloviev
  • D South
  • V Spaskov
  • A Specka
  • H Spitzer
  • R Stamen
  • B Stella
  • J Stiewe
  • I Strauch
  • U Straumann
  • S Tchetchelnitski
  • G Thompson
  • PD Thompson
  • F Tomasz
  • D Traynor
  • P Truol
  • G Tsipolitis
  • I Tsurin
  • J Turnau
  • JE Turney
  • E Tzamariudaki
  • A Uraev
  • M Urban
  • A Usik
  • S Valkar
  • A Valkarova
  • C Vallee
  • P Van Mechelen
  • AV Trevino
  • S Vassiliev
  • Y Vazdik
  • C Veelken
  • A Vest
  • A Vichnevski
  • V Volchinski
  • K Wacker
  • J Wagner
  • R Wallny
  • B Waugh
  • G Weber
  • R Weber
  • D Wegener
  • C Werner
  • N Werner
  • M Wessels
  • B Wessling
  • M Winde
  • GG Winter
  • C Wissing
  • EE Woehrling
  • E Wunsch
  • AC Wyatt
  • J Zacek
  • J Zalesak
  • Z Zhang
  • A Zhokin
  • F Zomer
  • M zur Nedden
Organisations
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Subatomic Physics
Original languageEnglish
Pages (from-to)241-257
JournalPhysics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume561
Issue number3-4
Publication statusPublished - 2003
Publication categoryResearch
Peer-reviewedYes