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Measurement of Isolated Photon Production in Deep-Inelastic Scattering at HERA

F.D. Aaron A. Aktas C. Alexa V. Andreev B. Antunovic S. Aplin A. Asmone A. Astvatsatourov S. Backovic A. Baghdasaryan P. Baranov E. Barrelet 1 W. Bartel S. Baudrand 2 M. Beckingham K. Begzsuren O. Behnke O. Behrendt A. Belousov N. Berger J.C. Bizot 2 M.-O. Boenig V. Boudry 3 I. Bozovic-Jelisavcic J. Bracinik G. Brandt M. Brinkmann V. Brisson 2 D. Bruncko F.W. Busser A. Bunyatyan G. Buschhorn L. Bystritskaya A.J. Campbell K.B. Cantun Avila F. Cassol-Brunner 4 K. Cerny V. Cerny V. Chekelian A. Cholewa J.G. Contreras J.A. Coughlan G. Cozzika 5 J. Cvach J.B. Dainton K. Daum M. Deak Y. de Boer B. Delcourt 2 M. del Degan J. Delvax A. de Roeck E.A. de Wolf C. Diaconu 4 V. Dodonov A. Dubak G. Eckerlin V. Efremenko S. Egli R. Eichler F. Eisele A. Eliseev E. Elsen S. Essenov A. Falkiewicz P.J.W. Faulkner L. Favart A. Fedotov R. Felst J. Feltesse 5 J. Ferencei L. Finke M. Fleischer A. Fomenko G. Franke T. Frisson 3 E. Gabathuler J. Gayler S. Ghazaryan S. Ginzburgskaya A. Glazov I. Glushkov L. Goerlich M. Goettlich N. Gogitidze S. Gorbounov M. Gouzevitch 3 C. Grab T. Greenshaw B.R. Grell G. Grindhammer S. Habib D. Haidt M. Hansson G. Heinzelmann C. Helebrant R.C.W. Henderson H. Henschel G. Herrera M. Hildebrandt K.H. Hiller D. Hoffmann 4 R. Horisberger A. Hovhannisyan T. Hreus M. Jacquet 2 M.E. Janssen X. Janssen V. Jemanov L. Jonsson D.P. Johnson A.W. Jung H. Jung M. Kapichine J. Katzy I.R. Kenyon C. Kiesling M. Klein C. Kleinwort T. Klimkovich T. Kluge A. Knutsson V. Korbel P. Kostka M. Kraemer K. Krastev J. Kretzschmar A. Kropivnitskaya K. Kruger M.P.J. Landon W. Lange G. Lastovicka-Medin P. Laycock A. Lebedev G. Leibenguth V. Lendermann S. Levonian G. Li 2 L. Lindfeld K. Lipka A. Liptaj B. List J. List N. Loktionova R. Lopez-Fernandez V. Lubimov A.-I. Lucaci-Timoce L. Lytkin A. Makankine E. Malinovski P. Marage Ll. Marti M. Martisikova H.-U. Martyn S.J. Maxfield A. Mehta K. Meier A.B. Meyer H. Meyer J. Meyer V. Michels S. Mikocki I. Milcewicz-Mika A. Mohamed F. Moreau 3 A. Morozov J.V. Morris M.U. Mozer K. Muller P. Murin K. Nankov B. Naroska Th. Naumann P.R. Newman C. Niebuhr A. Nikiforov G. Nowak K. Nowak M. Nozicka R. Oganezov B. Olivier J.E. Olsson S. Osman D. Ozerov V. Palichik I. Panagoulias M. Pandurovic Th. Papadopoulou C. Pascaud 2 G.D. Patel H. Peng E. Perez 5 D. Perez-Astudillo A. Perieanu A. Petrukhin I. Picuric S. Piec D. Pitzl R. Placakyte R. Polifka B. Povh T. Preda P. Prideaux V. Radescu A.J. Rahmat N. Raicevic T. Ravdandorj P. Reimer C. Risler E. Rizvi P. Robmann B. Roland R. Roosen A. Rostovtsev Z. Rurikova S. Rusakov D. Salek F. Salvaire D.P.C. Sankey M. Sauter E. Sauvan S. Schmidt S. Schmitt C. Schmitz L. Schoeffel 5 A. Schoning H.-C. Schultz-Coulon F. Sefkow R.N. Shaw-West I. Sheviakov L.N. Shtarkov T. Sloan I. Smiljanic P. Smirnov Y. Soloviev D. South V. Spaskov A. Specka 3 Z. Staykova M. Steder B. Stella J. Stiewe U. Straumann D. Sunar T. Sykora V. Tchoulakov G. Thompson P.D. Thompson T. Toll F. Tomasz T.H. Tran 2 D. Traynor T.N. Trinh 4 P. Truol I. Tsakov B. Tseepeldorj G. Tsipolitis I. Tsurin J. Turnau E. Tzamariudaki K. Urban D. Utkin A. Valkarova C. Vallee 4 P. van Mechelen A. Vargas Trevino Y. Vazdik S. Vinokurova V. Volchinski G. Weber R. Weber D. Wegener C. Werner M. Wessels Ch. Wissing R. Wolf E. W¨unsch S. Xella V. Yeganov J. Zacek J. Zalesak Zhen Zhang 2 A. Zhelezov A. Zhokin Y.C. Zhu T. Zimmermann H. Zohrabyan F. Zomer 2
Abstract : The production of isolated photons in deep-inelastic scattering $ep\to e \gamma X$ is measured with the H1 detector at HERA. The measurement is performed in the kinematic range of negative four-momentum transfer squared $450$ GeV. The analysis is based on a total integrated luminosity of 227~pb$^{-1}$. The production cross section of isolatedphotons with a transverse energy in the range $3 < E_T^\gamma < 10$ GeV and pseudorapidity range $-1.2 < \eta^\gamma < 1.8$ is measured as a function of $E_T^\gamma$, $\eta^\gamma$ and $Q^2$. Isolated photon cross sections are also measured for events with no jets or at least one hadronic jet. The measurements are compared with predictions from Monte Carlo generators modelling the photon radiation from the quark and the electron lines, as well as with calculations at leading and next to leading order in the strong coupling. The predictions significantly underestimate the measured cross sections.
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F.D. Aaron, A. Aktas, C. Alexa, V. Andreev, B. Antunovic, et al.. Measurement of Isolated Photon Production in Deep-Inelastic Scattering at HERA. European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2008, 54, pp.371-387. ⟨10.1140/epjc/s10052-008-0541-6⟩. ⟨in2p3-00192793⟩

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