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Measurement of Photon Production in the Very Forward Direction in Deep-Inelastic Scattering at HERA

F.D. Aaron C. Alexa V. Andreev S. Backovic A. Baghdasaryan S. Baghdasaryan E. Barrelet 1 W. Bartel K. Begzsuren A. Belousov P. Belov 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 J.G. Contreras J.A. Coughlan J. Cvach 1 J.B. Dainton K. Daum B. Delcourt 2 J. Delvax E.A. Dewolf C. Diaconu 4 M. Dobre V. Dodonov A. Dossanov A. Dubak G. Eckerlin S. Egli A. Eliseev E. Elsen L. Favart 2 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 3 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. Jonsson H. Jung M. Kapichine I.R. Kenyon C. Kiesling M. Klein C. Kleinwort T. Kluge R. Kogler P. Kostka M. Kraemer J. Kretzschmar K. Kr¨uger M.P.J. Landon W. Lange G. Laˇstovicka-Medin P. Laycock A. Lebedev V. Lendermann S. Levonian 3 K. Lipka B. List J. List R. Lopez-Fernandez V. Lubimov L. Lytkin Th. Naumann P.R. Newman C. Niebuhr D. Nikitin G. Nowak K. Nowak J.E. Olsson 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 1 M. Rotaru J.E. Ruiz Tabasco S. Rusakov D. S Alek D.P.C. Sankey M. Sauter E. Sauvan 4 S. Schmitt L. Schoeffel 5 A. Sch¨oning 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 T. Sykora P.D. Thompson T.H. Tran 2 D. Traynor P. Truöl I. Tsakov B. Tseepeldorj J. Turnau K. Urban A. Valkarova Corentin Vallée 4 P. van Mechelen Y. Vazdik D. Wegener E. W¨unsch J. Zacek 2 J. Zálešák Zhiqing Zhang 2 A. Zhokin H. Zohrabyan F. Zomer 2
Abstract : The production of photons at very small angles with respect to the proton beam direction is studied in deep-inelastic positron-proton scattering at HERA. The data are taken with the H1 detector in the years 2006 and 2007 and correspond to an integrated luminosity of $126 \mathrm{pb}^{-1}$. The analysis covers the range of negative four momentum transfer squared at the positron vertex $67.9$. The cross sections are normalised to the inclusive deep-inelastic scattering cross section and compared to the predictions of models of deep-inelastic scattering and models of the hadronic interactions of high energy cosmic rays.
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Submitted on : Thursday, June 30, 2011 - 2:19:44 PM
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F.D. Aaron, C. Alexa, V. Andreev, S. Backovic, A. Baghdasaryan, et al.. Measurement of Photon Production in the Very Forward Direction in Deep-Inelastic Scattering at HERA. European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2011, 71, 1771 (11p.). ⟨10.1140/epjc/s10052-011-1771-6⟩. ⟨in2p3-00605052⟩

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