Multi-lepton production at high transverse momentum at HERA

Sergei V. Chekanov, Malcolm Derrick, S. Magill, Brian Musgrave, D. Nicholass, J. Repond, R. Yoshida, M.C.K. Mattingly, P. Antonioli, Giacomo Bari

90 more authors

L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, F. Cindolo, M. Corradi, GIUSEPPE IACOBUCCI, A. Margotti, R. Nania, Alessandro Polini, S. Antonelli, M. Basile, M. Bindi, L. Cifarelli, A. Contin, S. De Pasquale, G. Sartorelli, ANTONINO ZICHICHI, D. Bartsch, Ian C. Brock, H. Hartmann, E. Hilger, H.‐P. Jakob, M. Jüngst, A.-E. Nuncio-Quiroz, E. Paul, U. Samson, V. Schönberg, R. Shehzadi, M. Wlasenko, J. D. Morris, M. Kaur, P. Kaur, I. Singh, M. Capua, Salvatore Fazio, Anna Mastroberardino, Marco Schioppa, G.F. Susinno, E. ̃Tassi, J.Y. Kim, Z. A. Ibrahim, F. Mohamad Idris, Burhanuddin Kamaluddin, Wan Ahmad Tajuddin Wan Abdullah, Y. Ning, Z. Ren, F. J. Sciulli, J. J. Chwastowski, A. Eskreys, J. Figiel, A. Galas, Krystyna Olkiewicz, B. Pawlik, P. Stopa, L. Zawiejski, L. Adamczyk, T. Bołd, I. Grabowska-Bołd, Danuta Kisielewska, J. Łukasik, M. Przybycień, L. Suszycki, A. Kotański, W. Słomiński, O. Behnke, J. K. Behr, U. Behrens, C. Blohm, K. Borras, D. Bot, R. Ciesielski, N. Coppola, S. Fang, A. Geiser, P. Göttlicher, J. Grebenyuk, I. M. Gregor, T. Haas, W. Hain, A. Hüttmann, F. Januschek, B. Kahle, I.I. Katkov, U. Klein, U. Kötz, H. Kowalski, M. Lisovyi, E. M. Lobodzinska, Bernd Löhr

2009

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DOI 10.1016/j.physletb.2009.08.026
Data confidence 70 medium
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It is built from checkable properties of the record itself: whether the article has a DOI, how many independent sources confirmed its data, whether the required fields are filled in, and how recent the latest confirmation is. Disagreement between sources and a missing identifier lower it. A value of 80 or above means the record was published without further checking; 60 to 79 means it is published at reduced confidence, with a manual check advisable. A record verified by an editor by hand is never pushed below 90 by a recalculation. This scores our data about the article, not the article itself.

Abstract

A search for events containing two or more high-transverse-momentum isolated leptons has been performed in ep collisions with the ZEUS detector at HERA using the full collected data sample, corresponding to an integrated luminosity of 480 pb −1 . The number of observed events has been compared with the prediction from the Standard Model, searching for possible deviations, especially for multi-lepton events with invariant mass larger than 100 GeV. Good agreement with the Standard Model has been observed. Total and differential cross sections for di-lepton production have been measured in a restricted phase space dominated by photon–photon collisions.