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, W Bartel, S Baumgartner, J Becker, M Beckingham, O Behnke, O Behrendt, A Belousov, C Berger, T Berndt, JC Bizot, J BohmeMO Boenig, V Boudry, J Bracinik, W Braunschweig, V Brisson, HB Broker, DP Brown, D Bruncko, FW Busser, A Bunyatyan, 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, B Delcourt, N Delerue, R Demirchyan, A De Roeck, EA De Wolf, C Diaconu, J Dingfelder, V Dodonov, JD Dowell, A Dubak, C Duprel, G Eckerlin, 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, 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, M Gregori, G Grindhammer, D Haidt, L Hajduk, J Haller, G Heinzelmann, RCW Henderson, H Henschel, O Henshaw, R Heremans, G Herrera, I Herynek, M Hildebrandt, KH Hiller, J Hladky, P Hoting, D Hoffmann, R Horisberger, A Hovhannisyan, M Ibbotson, M Jacquet, L Janauschek, X Janssen, V Jemanov, Leif Jönsson, C Johnson, DP Johnson, Hannes Jung, D Kant, M Kapichine, Martin Karlsson, J Katzy, F Keil, N Keller, J Kennedy, IR Kenyon, C Kiesling, M Klein, C Kleinwort, T Kluge, G Knies, B Koblitz, SD Kolya, V Korbel, P Kostka, R Koutouev, A Kropivnitskaya, J Kroseberg, 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, 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, HU Martyn, J Martyniak, SJ Maxfield, D Meer, A Mehta, K Meier, AB Meyer, H Meyer, J Meyer, S Michine, S Mikocki, D Milstead, F Moreau, A Morozov, JV Morris, K Muller, P Murin, V Nagovizin, B Naroska, J Naumann, T Naumann, PR Newman, F Niebergall, C Niebuhr, D Nikitin, G Nowak, M Nozicka, B Olivier, JE Olsson, D Ozerov, C Pascaud, GD Patel, M Peez, E 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, DPC Sankey, E Sauvan, S Schatzel, J Scheins, FP Schilling, P Schleper, SS Schmidt, S Schmitt, M Schneider, L Schoeffel, A Schoning, 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, 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, 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, J Zacek, J Zalesak, Z Zhang, A Zhokin, F Zomer, M zur Nedden

Research output: Contribution to journalArticlepeer-review

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 +/- 0.04 and 0.23 +/- 0.04, respectively.
Original languageEnglish
Pages (from-to)17-29
JournalEuropean Physical Journal C. Particles and Fields
Volume31
Issue number1
DOIs
Publication statusPublished - 2003

Subject classification (UKÄ)

  • Subatomic Physics

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