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Measurement of the Azimuthal Correlation between the most Forward Jet and the Scattered Positron 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 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 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. Jönsson H. Jung M. Kapichine I.R. Kenyon C. Kiesling M. Klein C. Kleinwort T. Kluge R. Kogler P. Kostka M. Kraemer J. Kretzschmar K. Krüger M.P.J. Landon W. Lange G. Lastovicka-Medin P. Laycock A. Lebedev V. Lendermann S. Levonian 3 K. Lipka B. List J. List 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. Mudrinic K. Müller 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 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. 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. Tru¨ol I. Tsakov B. Tseepeldorj J. Turnau A. Valkarova C. Vallee 4 P. van Mechelen Y. Vazdik D. Wegener E. W¨unsch J. Žáček J. Zálešák Zhen Zhang 2 A. Zhokin H. Zohrabyan F. Zomer 2
Abstract : Deep-inelastic positron-proton scattering events at low photon virtuality Q^2 with a forward jet, produced at small angles with respect to the proton beam, are measured with the H1 detector at HERA. A subsample of events with an additional jet in the central region is also studied. For both samples differential cross sections and normalised distributions are measured as a function of the azimuthal angle difference, Delta phi, between the forward jet and the scattered positron. The sensitivity to QCD evolution mechanisms is tested by comparing the data to predictions of Monte Carlo generators based on different evolution approaches as well as to next-to-leading order calculations.
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Submitted on : Tuesday, November 22, 2011 - 2:47:31 PM
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F.D. Aaron, C. Alexa, V. Andreev, S. Backovic, A. Baghdasaryan, et al.. Measurement of the Azimuthal Correlation between the most Forward Jet and the Scattered Positron in Deep-Inelastic Scattering at HERA. European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2012, 72, pp.1910. ⟨10.1140/epjc/s10052-012-1910-8⟩. ⟨in2p3-00643194⟩

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