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Multi-electron production at high transverse momenta in $ep$ collisions at HERA

A. Aktas V. Andreev T. Anthonis A. Asmone A. Babaev S. Backovic J. Bahr P. Baranov E. Barrelet 1 W. Bartel S. Baumgartner J. Becker M. Beckingham O. Behnke O. Behrendt A. Belousov C. Berger T. Berndt J.C. Bizot 2 J. Bohme M.O. Boenig V. Boudry 3 J. Bracinik W. Braunschweig V. Brisson 2 H.B. Broker D.P. Brown D. Bruncko F.W. Busser A. Bunyatyan G. Buschhorn L. Bystritskaya A.J. Campbell S. Caron F. Cassol-Brunner 4 V. Chekelian D. Clarke C. Collard J.G. Contreras Y.R. Coppens J.A. Coughlan M.C. Cousinou 4 B.E. Cox G. Cozzika J. Cvach J.B. Dainton W.D. Dau K. Daum B. Delcourt 2 N. Delerue 4 R. Demirchyan A. de Roeck E.A. de Wolf C. Diaconu 4 J. Dingfelder V. Dodonov J.D. Dowell A. Dubak C. Duprel G. Eckerlin V. Efremenko S. Egli R. Eichler F. Eisele M. Ellerbrock E. Elsen M. Erdmann W. Erdmann P.J.W. Faulkner L. Favart A. Fedotov R. Felst J. Ferencei M. Fleischer P. Fleischmann Y.H. 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 M. Gregori G. Grindhammer D. Haidt L. Hajduk J. Haller G. Heinzelmann R.C.W. Henderson H. Henschel O. Henshaw R. Heremans G. Herrera I. Herynek M. Hildebrandt K.H. Hiller J. Hladky P. Hoting D. Hoffmann 4 R. Horisberger A. Hovhannisyan M. Ibbotson M. Jacquet 2 L. Janauschek X. Janssen V. Jemanov L. Jonsson C. Johnson D.P. Johnson H. Jung D. Kant M. Kapichine M. Karlsson J. Katzy F. Keil N. Keller J. Kennedy I.R. Kenyon C. Kiesling M. Klein C. Kleinwort T. Kluge G. Knies B. Koblitz S.D. Kolya V. Korbel P. Kostka R. Koutouev A. Kropivnitskaya J. Kroseberg J. Kueckens T. Kuhr M.P.J. Landon W. Lange T. Lastovicka P. Laycock A. Lebedev B. Leiner R. Lemrani V. Lendermann S. Levonian B. List E. Lobodzinska N. Loktionova R. Lopez-Fernandez V. Lubimov H. Lueders S. Luders D. Luke L. Lytkin A. Makankine N. Malden E. Malinovski S. Mangano P. Marage J. Marks R. Marshall H.U. Martyn J. Martyniak S.J. Maxeld D. Meer A. Mehta K. Meier A.B. Meyer H. Meyer J. Meyer S. Michine S. Mikocki D. Milstead F. Moreau 3 A. Morozov J.V. Morris K. Muller P. Murn V. Nagovizin B. Naroska J. Naumann T. Naumann P.R. Newman F. Niebergall C. Niebuhr D. Nikitin G. Nowak M. Nozicka B. Olivier J.E. Olsson D. Ozerov C. Pascaud 2 G.D. Patel M. Peez 4 Emile Perez A. Petrukhin D. Pitzl R. Poschl B. Povh N. Raicevic J. Rauschenberger P. Reimer B. Reisert C. Risler E. Rizvi P. Robmann R. Roosen A. Rostovtsev S. Rusakov K. Rybicki D.P.C. Sankey E. Sauvan 4 S. Schatzel J. Scheins F.P. Schilling P. Schleper D. Schmidt S. Schmidt S. Schmitt M. Schneider 4 L. Schoeffel A. Schoning V. Schroder H.C. Schultz-Coulon C. Schwanenberger K. Sedlak F. Sefkow I. Sheviakov L.N. Shtarkov Y. Sirois 3 T. Sloan P. Smirnov Y. Soloviev D. South V. Spaskov A. Specka 3 H. Spitzer R. Stamen B. Stella J. Stiewe I. Strauch U. Straumann G. Thompson P.D. Thompson F. Tomasz D. Traynor P. Truol G. Tsipolitis I. Tsurin J. Turnau J.E. Turney E. Tzamariudaki A. Uraev Martin Urban A. Usik S. Valkar A. Valkarova C. Vallee 4 P. van Mechelen A. Vargas Trevino S. Vassiliev Y. Vazdik C. Veelken A. Vest A. Vichnevski V. Volchinski K. Wacker J. Wagner B. Waugh G. Weber R. Weber D. Wegener C. Werner N. Werner M. Wessels B. Wessling M. Winde G.G. Winter C. Wissing E.E. Woehrling E. Wunsch J. Zacek J. Zalesak Zhiqing Zhang 2 A. Zhokin F. Zomer 2 M. Zur Nedden
Abstract : Multi-electron production is studied at high electron transverse momentum in positron- and electron-proton collisions using the H1 detector at HERA. The data correspond to an integrated luminosity of 115 pb-1. Di-electron and tri-electron event yields are measured. Cross sections are derived in a restricted phase space region dominated by photon-photon collisions. In general good agreement is found with the Standard Model predictions. However, for electron pair invariant masses above 100 GeV, three di-electron events and three tri-electron events are observed, compared to Standard Model expectations of 0.30 \pm 0.04 and 0.23 \pm 0.04, respectively.
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Submitted on : Thursday, December 11, 2003 - 10:05:03 AM
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A. Aktas, V. Andreev, T. Anthonis, A. Asmone, A. Babaev, et al.. Multi-electron production at high transverse momenta in $ep$ collisions at HERA. European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2003, 31, pp.17-29. ⟨in2p3-00014217⟩

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