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Observation of the Hadronic Final State Charge Asymmetry in High Q^2 Deep-Inelastic Scattering at HERA

F.D. Aaron M. Aldaya Martin C. Alexa K. Alimujiang V. Andreev B. Antunovic A. Asmone S. Backovic A. 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. Bruncko 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. Deák Y. de Boer B. Delcourt 2 M. del Degan J. Delvax E.A. de Wolf C. Diaconu 4 V. Dodonov A. Dossanov A. Dubak G. Eckerlin V. Efremenko S. Egli A. Eliseev E. Elsen A. Falkiewicz 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 I. Glushkov L. Goerlich N. Gogitidze M. Gouzevitch C. Grab 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 M. Jacquet 2 M.E. Janssen 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 K. Krastev J. Kretzschmar A. Kropivnitskaya K. Krüger K. Kutak M.P.J. Landon W. Lange G. La?tovi?ka-Medin P. Laycock A. Lebedev G. Leibenguth V. Lendermann S. Levonian G. Li 2 K. Lipka A. Liptaj B. List J. List N. Loktionova R. Lopez-Fernandez V. Lubimov L. Lytkin A. Makankine E. Malinovski P. Marage Ll. Marti H.-U. Martyn S.J. Maxfield A. Mehta A.B. Meyer H. Meyer J. Meyer V. Michels S. Mikocki I. Milcewicz-Mika F. Moreau 3 A. Morozov J.V. Morris M.U. Mozer M. Mudrinic K. Müller P. Murín Th. Naumann P.R. Newman C. Niebuhr A. Nikiforov G. Nowak K. Nowak M. Nozicka B. Olivier J.E. Olsson S. Osman D. Ozerov V. Palichik I. Panagoulias M. Pandurovic Th. Papadopoulou C. Pascaud 2 G.D. Patel O. Pejchal Emile Perez 5 A. Petrukhin I. Picuric S. Piec D. Pitzl R. Pla?akyt? B. Pokorny R. Polifka B. Povh T. Preda V. Radescu A.J. Rahmat N. Raicevic A. Raspiareza T. Ravdandorj P. Reimer E. Rizvi P. Robmann B. Roland R. Roosen A. Rostovtsev M. Rotaru J.E. Ruiz Tabasco Z. Rurikova S. Rusakov D. ?álek D.P.C. Sankey M. Sauter E. Sauvan 4 S. Schmitt L. Schoeffel 5 A. Schöning H.-C. Schultz-Coulon F. Sefkow R.N. Shaw-West 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 V. Tchoulakov G. Thompson P.D. Thompson T. Toll F. Tomasz T.H. Tran 2 D. Traynor T.N. Trinh 4 P. Truöl I. Tsakov B. Tseepeldorj J. Turnau K. Urban A. Valkárová Corentin Vallée 4 P. van Mechelen A. Vargas Trevino Y. Vazdik S. Vinokurova V. Volchinski M. von den Driesch D. Wegener Ch. Wissing E. Wünsch J. Žáček J. Zálešák Zhiqing Zhang 2 A. Zhokin T. Zimmermann H. Zohrabyan F. Zomer 2 R. Zus
Abstract : A first measurement is presented of the charge asymmetry in the hadronic final state from the hard interaction in deep-inelastic ep neutral current scattering at HERA. The measurement is performed in the range of negative squared four momentum transfer 100 < q^2 < 8,000 GeV^2. The difference between the event normalised distributions of the scaled momentum, x_p, for positively and negatively charged particles, measured in the current region of the Breit frame, is studied together with its evolution as a function of Q. The results are compared to Monte Carlo models at the hadron and parton level.
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Submitted on : Friday, October 23, 2009 - 1:35:23 PM
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F.D. Aaron, M. Aldaya Martin, C. Alexa, K. Alimujiang, V. Andreev, et al.. Observation of the Hadronic Final State Charge Asymmetry in High Q^2 Deep-Inelastic Scattering at HERA. Physics Letters B, Elsevier, 2009, 681, pp.125-133. ⟨10.1016/j.physletb.2009.09.056⟩. ⟨in2p3-00425903⟩

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