/ Experiment-HEP arXiv:0907.2666


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


Aaron, F.D. (Bucharest U.) ; Aldaya Martin, M. (DESY) ; Alexa, C. (Bucharest, IFIN-HH) ; Alimujiang, K. (DESY) ; Andreev, V. (Lebedev Inst.) ; Antunovic, B. (DESY) ; Asmone, A. (INFN, Rome3) ; Backovic, S. (Montenegro U.) ; Baghdasaryan, A. (Yerevan Phys. Inst.) ; Barrelet, E. (Paris U., VI-VII) ; Bartel, W. (DESY) ; Begzsuren, K. (Ulan Bator, Inst. Phys. Tech.) ; Belousov, A. (Lebedev Inst.) ; Bizot, J.C. (Orsay, LAL) ; Boudry, V. (Ecole Polytechnique) ; Bozovic-Jelisavcic, I. (VINCA Inst. Nucl. Sci., Belgrade) ; Bracinik, J. (Birmingham U.) ; Brandt, G. (DESY) ; Brinkmann, M. (Hamburg U.) ; Brisson, V. (Orsay, LAL) ; Bruncko, D. (Kosice, IEF) ; Bunyatyan, A. (Yerevan Phys. Inst.) ; Buschhorn, G. (Munich, Max Planck Inst.) ; Bystritskaya, L. (Moscow, ITEP) ; Campbell, A.J. (DESY) ; Cantun Avila, K.B. (Merida, IPN) ; Cassol-Brunner, F. (Marseille, CPPM) ; Cerny, K. (Charles U.) ; Cerny, V. (Comenius U.) ; Chekelian, V. (Munich, Max Planck Inst.) ; Cholewa, A. (DESY) ; Contreras, J.G. (Merida, IPN) ; Coughlan, J.A. (Rutherford) ; Cozzika, G. (DSM, DAPNIA, Saclay) ; Cvach, J. (Prague, Inst. Phys.) ; Dainton, J.B. (Liverpool U.) ; Daum, K. (Wuppertal U.) ; Deak, M. (DESY) ; de Boer, Y. (DESY) ; Delcourt, B. (Orsay, LAL) ; Del Degan, M. (Zurich, ETH) ; Delvax, J. (Antwerp U., WISINF) ; De Wolf, E.A. (Antwerp U., WISINF) ; Diaconu, C. (Marseille, CPPM) ; Dodonov, V. (Heidelberg, Max Planck Inst.) ; Dossanov, A. (Munich, Max Planck Inst.) ; Dubak, A. (Munich, Max Planck Inst.) ; Eckerlin, G. (DESY) ; Efremenko, V. (Moscow, ITEP) ; Egli, S. (PSI, Villigen) ; Eliseev, A. (Lebedev Inst.) ; Elsen, E. (DESY) ; Falkiewicz, A. (Cracow, INP) ; Favart, L. (Antwerp U., WISINF) ; Fedotov, A. (Moscow, ITEP) ; Felst, R. (DESY) ; Feltesse, J. (Hamburg U.) ; Ferencei, J. (Kosice, IEF) ; Fischer, D.-J. (DESY) ; Fleischer, M. (DESY) ; Fomenko, A. (Lebedev Inst.) ; Gabathuler, E. (Liverpool U.) ; Gayler, J. (DESY) ; Ghazaryan, Samvel (Yerevan Phys. Inst.) ; Glazov, A. (DESY) ; Glushkov, I. (DESY, Zeuthen) ; Goerlich, L. (Cracow, INP) ; Gogitidze, N. (Lebedev Inst.) ; Gouzevitch, M. (DESY) ; Grab, C. (Zurich, ETH) ; Greenshaw, T. (Liverpool U.) ; Grell, B.R. (DESY) ; Grindhammer, G. (Munich, Max Planck Inst.) ; Habib, S. (World Lab, Lausanne) ; Haidt, D. (DESY) ; Helebrant, C. (DESY) ; Henderson, R.C.W. (Lancaster U.) ; Hennekemper, E. (Kirchhoff Inst. Phys.) ; Henschel, H. (DESY, Zeuthen) ; Herbst, M. (Kirchhoff Inst. Phys.) ; Herrera, G. (CINVESTAV, IPN) ; Hildebrandt, M. (PSI, Villigen) ; Hiller, K.H. (DESY, Zeuthen) ; Hoffmann, D. (Marseille, CPPM) ; Horisberger, R. (PSI, Villigen) ; Hreus, T. (Kosice U.) ; Jacquet, M. (Orsay, LAL) ; Janssen, M.E. (DESY) ; Janssen, X. (Antwerp U., WISINF) ; Jonsson, L. (Lund U.) ; Jung, Andreas Werner (Kirchhoff Inst. Phys.) ; Jung, H. (DESY) ; Kapichine, M. (Dubna, JINR) ; Katzy, J. (DESY) ; Kenyon, I.R. (Birmingham U.) ; Kiesling, C. (Munich, Max Planck Inst.) ; Klein, M. (Liverpool U.) ; Kleinwort, C. (DESY) ; Kluge, T. (Liverpool U.) ; Knutsson, A. (DESY) ; Kogler, R. (Munich, Max Planck Inst.) ; Kostka, P. (DESY, Zeuthen) ; Kraemer, M. (DESY) ; Krastev, K. (DESY) ; Kretzschmar, J. (Liverpool U.) ; Kropivnitskaya, A. (Moscow, ITEP) ; Kruger, K. (Kirchhoff Inst. Phys.) ; Kutak, K. (DESY) ; Landon, M.P.J. (Queen Mary, U. of London) ; Lange, W. (DESY, Zeuthen) ; Lastovicka-Medin, G. (Montenegro U.) ; Laycock, P. (Liverpool U.) ; Lebedev, A. (Lebedev Inst.) ; Leibenguth, G. (Zurich, ETH) ; Lendermann, V. (Kirchhoff Inst. Phys.) ; Levonian, S. (DESY) ; Li, G. (Orsay, LAL) ; Lipka, K. (Hamburg U.) ; Liptaj, A. (Munich, Max Planck Inst.) ; List, B. (Hamburg U.) ; List, J. (DESY) ; Loktionova, N. (Lebedev Inst.) ; Lopez-Fernandez, R. (CINVESTAV, IPN) ; Lubimov, V. (Moscow, ITEP) ; Lytkin, L. (Heidelberg, Max Planck Inst.) ; Makankine, A. (Dubna, JINR) ; Malinovski, E. (Lebedev Inst.) ; Marage, P. (Antwerp U., WISINF) ; Marti, Ll. (DESY) ; Martyn, H.-U. (Aachen, Tech. Hochsch.) ; Maxfield, S.J. (Liverpool U.) ; Mehta, A. (Liverpool U.) ; Meyer, A.B. (DESY) ; Meyer, H. (DESY) ; Meyer, H. (Wuppertal U., Dept. Math.) ; Meyer, J. (DESY) ; Michels, V. (DESY) ; Mikocki, S. (Cracow, INP) ; Milcewicz-Mika, I. (Cracow, INP) ; Moreau, F. (Ecole Polytechnique) ; Morozov, A. (Dubna, JINR) ; Morris, J.V. (Rutherford) ; Mozer, Matthias Ulrich (Antwerp U., WISINF) ; Mudrinic, M. (VINCA Inst. Nucl. Sci., Belgrade) ; Muller, K. (Zurich U.) ; Murin, P. (Kosice U.) ; Naumann, Th. (DESY, Zeuthen) ; Newman, P.R. (Birmingham U.) ; Niebuhr, C. (DESY) ; Nikiforov, A. (DESY) ; Nowak, G. (Cracow, INP) ; Nowak, K. (Zurich U.) ; Nozicka, M. (DESY) ; Olivier, B. (Munich, Max Planck Inst.) ; Olsson, J.E. (DESY) ; Osman, S. (Lund U.) ; Ozerov, D. (Moscow, ITEP) ; Palichik, V. (Dubna, JINR) ; Panagoulias, I. (Natl. Tech. U., Athens) ; Pandurovic, M. (VINCA Inst. Nucl. Sci., Belgrade) ; Papadopoulou, Th. (Natl. Tech. U., Athens) ; Pascaud, C. (Orsay, LAL) ; Patel, G.D. (Liverpool U.) ; Pejchal, O. (Charles U.) ; Perez, E. (CERN) ; Petrukhin, A. (Moscow, ITEP) ; Picuric, I. (Montenegro U.) ; Piec, S. (DESY, Zeuthen) ; Pitzl, D. (DESY) ; Placakyte, R. (DESY) ; Pokorny, B. (Hamburg U.) ; Polifka, R. (Charles U.) ; Povh, B. (Heidelberg, Max Planck Inst.) ; Preda, T. (Bucharest, IFIN-HH) ; Radescu, V. (DESY) ; Rahmat, A.J. (Liverpool U.) ; Raicevic, N. (Montenegro U.) ; Raspiareza, A. (Munich, Max Planck Inst.) ; Ravdandorj, T. (Ulan Bator, Inst. Phys. Tech.) ; Reimer, P. (Prague, Inst. Phys.) ; Rizvi, E. (Queen Mary, U. of London) ; Robmann, P. (Zurich U.) ; Roland, B. (Antwerp U., WISINF) ; Roosen, R. (Antwerp U., WISINF) ; Rostovtsev, A. (Moscow, ITEP) ; Rotaru, M. (Bucharest, IFIN-HH) ; Ruiz Tabasco, J.E. (Merida, IPN) ; Rurikova, Z. (DESY) ; Rusakov, S. (Lebedev Inst.) ; Salek, D. (Charles U.) ; Sankey, D.P.C. (Rutherford) ; Sauter, M. (Zurich, ETH) ; Sauvan, E. (Marseille, CPPM) ; Schmitt, S. (DESY) ; Schoeffel, L. (DSM, DAPNIA, Saclay) ; Schoning, A. (Heidelberg U.) ; Schultz-Coulon, H.-C. (Kirchhoff Inst. Phys.) ; Sefkow, F. (DESY) ; Shaw-West, R.N. (Birmingham U.) ; Shtarkov, L.N. (Lebedev Inst.) ; Shushkevich, S. (Munich, Max Planck Inst.) ; Sloan, T. (Lancaster U.) ; Smiljanic, Ivan (VINCA Inst. Nucl. Sci., Belgrade) ; Soloviev, Y. (Lebedev Inst.) ; Sopicki, P. (Cracow, INP) ; South, D. (Dortmund U.) ; Spaskov, V. (Dubna, JINR) ; Specka, Arnd E. (Ecole Polytechnique) ; Staykova, Z. (DESY) ; Steder, M. (DESY) ; Stella, B. (INFN, Rome3) ; Stoicea, G. (Bucharest, IFIN-HH) ; Straumann, U. (Zurich U.) ; Sunar, D. (Antwerp U., WISINF) ; Sykora, T. (Antwerp U., WISINF) ; Tchoulakov, V. (Dubna, JINR) ; Thompson, G. (Queen Mary, U. of London) ; Thompson, P.D. (Birmingham U.) ; Toll, T. (DESY) ; Tomasz, F. (Kosice, IEF) ; Tran, T.H. (Orsay, LAL) ; Traynor, D. (Queen Mary, U. of London) ; Trinh, T.N. (Marseille, CPPM) ; Truol, P. (Zurich U.) ; Tsakov, I. (Sofiya, Inst. Nucl. Res.) ; Tseepeldorj, B. (Mongolian Natl. U.) ; Turnau, J. (Cracow, INP) ; Urban, K. (Kirchhoff Inst. Phys.) ; Valkarova, A. (Charles U.) ; Vallee, C. (Marseille, CPPM) ; Van Mechelen, P. (Antwerp U., WISINF) ; Vargas Trevino, A. (DESY) ; Vazdik, Y. (Lebedev Inst.) ; Vinokurova, S. (DESY) ; Volchinski, V. (Yerevan Phys. Inst.) ; von den Driesch, M. (DESY) ; Wegener, D. (Dortmund U.) ; Wissing, Ch. (DESY) ; Wunsch, E. (DESY) ; Zacek, J. (Charles U.) ; Zalesak, J. (Prague, Inst. Phys.) ; Zhang, Z. (Orsay, LAL) ; Zhokin, A. (Moscow, ITEP) ; Zimmermann, T. (Zurich, ETH) ; Zohrabyan, H. (Yerevan Phys. Inst.) ; Zomer, F. (Orsay, LAL) ; Zus, R. (Bucharest, IFIN-HH)

Published in: Phys.Lett.
Year: 2009
Vol.: B681
Page No: 125-133
Pages: 18

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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