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Diffractive Dijet Photoproduction in ep Collisions at HERA

F.D. Aaron C. Alexa V. Andreev S. Backovic A. Baghdasaryan S. Baghdasaryan E. Barrelet 1 W. Bartel K. Begzsuren A. Belousov J.C. Bizot 2 V. Boudry 3 I. Bozovic-Jelisavcic J. Bracinik G. Brandt M. Brinkmann V. Brisson 2 D. Britzger D. Bruncko A. Bunyatyan G. Buschhorn L. Bystritskaya A.J. Campbell K.B. Cantun Avila F. Ceccopieri K. Cerny V. Cerny V. Chekelian A. Cholewa J.G. Contreras J.A. Coughlan J. Cvach J.B. Dainton K. Daum B. Delcourt 2 J. Delvax E.A. de Wolf C. Diaconu 4 M. Dobre V. Dodonov A. Dossanov A. Dubak G. Eckerlin S. Egli A. Eliseev E. Elsen L. Favart A. Fedotov R. Felst J. Feltesse 5 J. Ferencei D.-J. Fischer M. Fleischer A. Fomenko E. Gabathuler J. Gayler S. Ghazaryan A. Glazov L. Goerlich N. Gogitidze M. Gouzevitch C. Grab A. Grebenyuk T. Greenshaw B.R. Grell G. Grindhammer S. Habib D. Haidt C. Helebrant R.C.W. Henderson E. Hennekemper H. Henschel M. Herbst G. Herrera M. Hildebrandt K.H. Hiller D. Hoffmann 4 R. Horisberger T. Hreus F. Huber M. Jacquet 2 X. Janssen L. Jönsson A.W. Jung H. Jung M. Kapichine J. Katzy I.R. Kenyon C. Kiesling M. Klein C. Kleinwort T. Kluge A. Knutsson R. Kogler P. Kostka M. Kraemer J. Kretzschmar K. Krüuger K. Kutak M.P.J. Landon W. Lange G. Lastovicka-Medin P. Laycock A. Lebedev V. Lendermann S. Levonian K. Lipka B. List J. List N. Loktionova R. Lopez-Fernandez V. Lubimov A. Makankine E. Malinovski P. Marage H.-U. Martyn S.J. Maxfield A. Mehta A.B. Meyer H. Meyer J. Meyer S. Mikocki I. Milcewicz-Mika F. Moreau 3 A. Morozov J.V. Morris M.U. Mozer M. Mudrinic K. Müuller Th. Naumann P.R. Newman C. Niebuhr D. Nikitin G. Nowak K. Nowak J.E. Olsson S. Osman D. Ozerov P. Pahl V. Palichik I. Panagouliasl M. Pandurovic Th. Papadopouloul C. Pascaud 2 G.D. Patel E. Perez 5 A. Petrukhin I. Picuric S. Piec H. Pirumov D. Pitzl R. Placakyte B. Pokorny R. Polifka B. Povh V. Radescu N. Raicevic T. Ravdandorj P. Reimer E. Rizvi P. Robmann R. Roosen A. Rostovtsev M. Rotaru J.E. Ruiz Tabasco S. Rusakov D. Salek D.P.C. Sankey M. Sauter E. Sauvan 4 S. Schmitt L. Schoeffel 5 A. Schöoning H.-C. Schultz-Coulon F. Sefkow L.N. Shtarkov S. Shushkevich T. Sloan I. Smiljanic Y. Soloviev P. Sopicki D. South V. Spaskov A. Specka 3 Z. Staykova M. Steder B. Stella G. Stoicea U. Straumann D. Sunar T. Sykora G. Thompson P.D. Thompson T. Toll T.H. Tran 2 D. Traynor P. Truol I. Tsakov B. Tseepeldorj J. Turnau K. Urban A. Valkarova C. Vallee 4 P. van Mechelen Y. Vazdik M. von den Driesch D. Wegener E. Wunsch J. Zacek J. Zalesak Zhiqing Zhang 2 A. Zhokin H. Zohrabyan F. Zomer 2
1 LPNHE - Laboratoire de Physique Nucléaire et de Hautes Énergies
2 LAL - Laboratoire de l'Accélérateur Linéaire
3 LLR - Laboratoire Leprince-Ringuet
4 CPPM - Centre de Physique des Particules de Marseille
5 IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers
Abstract : Measurements are presented of single and double-differential dijet cross sections in diffractive photoproduction based on a data sample with an integrated luminosity of 47 pb^-1. The events are of the type ep -> eXY, where the hadronic system X contains at least two jets and is separated by a large rapidity gap from the system Y, which consists of a leading proton or low-mass proton excitation. The dijet cross sections are compared with QCD calculations at next-to-leading order and with a Monte Carlo model based on leading order matrix elements with parton showers. The measured cross sections are smaller than those obtained from the next-to-leading order calculations by a factor of about 0.6. This suppression factor has no significant dependence on the fraction x_gamma of the photon four-momentum entering the hard subprocess. Ratios of the diffractive to the inclusive dijet cross sections are measured for the first time and are compared with Monte Carlo models.
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Journal articles
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http://hal.in2p3.fr/in2p3-00546126
Contributor : Sabine Starita <>
Submitted on : Monday, December 13, 2010 - 4:49:25 PM
Last modification on : Tuesday, December 8, 2020 - 3:45:42 AM

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IN2P3 | UPMC | LLR | LPNHE | LAL | CNRS | X-LLR | X | CPPM | UNIV-AMU | DSM-IRFU | CEA | CEA-DRF | X-DEP-PHYS | SORBONNE-UNIVERSITE | UNIV-PARIS7 | USPC | SU-SCIENCES | UNIV-PARIS | UP-SCIENCES | SU-TI

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F.D. Aaron, C. Alexa, V. Andreev, S. Backovic, A. Baghdasaryan, et al.. Diffractive Dijet Photoproduction in ep Collisions at HERA. European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2010, 70, pp.15-37. ⟨10.1140/epjc/s10052-010-1448-6⟩. ⟨in2p3-00546126⟩

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