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Forward $\pi^0$ Production and Associated Transverse Energy Flow in Deep-Inelastic Scattering at HERA

By A. Aktas, V. Andreev, T. Anthonis, A. Asmone, A. Babaev, S. Backovic, J. Bahr, P. Baranov, E. Barrelet, W. Bartel, S. Baumgartner, J. Becker, M. Beckingham, O. Behnke, O. Behrendt, A. Belousov, Ch. Berger, N. Berger, T. Berndt, J.C. Bizot, J. Bohme, M.-O. Boenig, V. Boudry, J. Bracinik, V. Brisson, H.-B. Broker, D.P. Brown, D. Bruncko, F.W. Busser, A. Bunyatyan, G. Buschhorn, L. Bystritskaya, A.J. Campbell, S. Caron, F. Cassol-Brunner, K. Cerny, V. Chekelian, C. Collard, J.G. Contreras, Y.R. Coppens, J.A. Coughlan, B.E. Cox, G. Cozzika, J. Cvach, J.B. Dainton, W.D. Dau, K. Daum, B. Delcourt, R. Demirchyan, A. De Roeck, K. Desch, E.A. De Wolf, C. Diaconu, J. Dingfelder, V. Dodonov, A. Dubak, C. Duprel, G. Eckerlin, V. Efremenko, S. Egli, R. Eichler, F. Eisele, M. Ellerbrock, E. Elsen, M. Erdmann, W. Erdmann, P.J.W. Faulkner, L. Favart, A. Fedotov, R. Felst, J. Ferencei, M. Fleischer, P. Fleischmann, Y.H. Fleming, G. Flucke, G. Flugge, A. Fomenko, I. Foresti, J. Formanek, G. Franke, G. Frising, E. Gabathuler, K. Gabathuler, E. Garutti, J. Garvey, J. Gayler, R. Gerhards, C. Gerlich, S. Ghazaryan, L. Goerlich, N. Gogitidze, S. Gorbounov, C. Grab, H. Grassler, T. Greenshaw, M. Gregori, G. Grindhammer, C. Gwilliam, D. Haidt, L. Hajduk, J. Haller, M. Hansson, G. Heinzelmann, R.C.W. Henderson, H. Henschel, O. Henshaw, R. Heremans, G. Herrera, I. Herynek, R.-D. Heuer, M. Hildebrandt, K.H. Hiller, P. Hoting, D. Hoffmann, R. Horisberger, A. Hovhannisyan, M. Ibbotson, M. Ismail, M. Jacquet, L. Janauschek, X. Janssen, V. Jemanov, L. Jonsson, D.P. Johnson, H. Jung, D. Kant, M. Kapichine, M. Karlsson, J. Katzy, N. Keller, J. Kennedy, I.R. Kenyon, C. Kiesling, M. Klein, C. Kleinwort, T. Klimkovich, T. Kluge, G. Knies, A. Knutsson, B. Koblitz, V. Korbel, P. Kostka, R. Koutouev, A. Kropivnitskaya, J. Kroseberg, J. Kuckens, T. Kuhr, M.P.J. Landon, W. Lange, T. Lastovicka, P. Laycock, A. Lebedev, B. Leiner, R. Lemrani, V. Lendermann, S. Levonian, L. Lindfeld, K. Lipka, B. List, E. Lobodzinska, N. Loktionova, R. Lopez-Fernandez, V. Lubimov, H. Lueders, D. Luke, T. Lux, L. Lytkin, A. Makankine, N. Malden, E. Malinovski, S. Mangano, P. Marage, J. Marks, R. Marshall, M. Martisikova, H.-U. Martyn, S.J. Maxfield, D. Meer, A. Mehta, K. Meier, A.B. Meyer, H. Meyer, J. Meyer, S. Michine, S. Mikocki, I. Milcewicz-Mika, D. Milstead, A. Mohamed, F. Moreau, A. Morozov, I. Morozov, J.V. Morris, M.U. Mozer, K. Muller, P. Murn, V. Nagovizin, B. Naroska, J. Naumann, Th. Naumann, P.R. Newman, C. Niebuhr, A. Nikiforov, D. Nikitin, G. Nowak, M. Nozicka, R. Oganezov, B. Olivier, J.E. Olsson, G. Ossoskov, D. Ozerov, C. Pascaud, G.D. Patel, M. Peez, E. Perez, A. Perieanu, A. Petrukhin, D. Pitzl, R. Placakyte, R. Poschl, B. Portheault, B. Povh, N. Raicevic, Z. Ratiani, P. Reimer, B. Reisert, A. Rimmer, C. Risler, E. Rizvi, P. Robmann, B. Roland, R. Roosen, A. Rostovtsev, Z. Rurikova, S. Rusakov, K. Rybicki, D.P.C. Sankey, E. Sauvan, S. Schatzel, J. Scheins, F.-P. Schilling, P. Schleper, S. Schmidt, S. Schmitt, M. Schneider, L. Schoeffel, A. Schoning, V. Schroder, H.-C. Schultz-Coulon, C. Schwanenberger, K. Sedlak, F. Sefkow, I. Sheviakov, L.N. Shtarkov, Y. Sirois, T. Sloan, P. Smirnov, Y. Soloviev, D. South, V. Spaskov, A. Specka, H. Spitzer, R. Stamen, B. Stella, J. Stiewe, I. Strauch, U. Straumann, V. Tchoulakov, G. Thompson, P.D. Thompson, F. Tomasz, D. Traynor, P. Truol, G. Tsipolitis, I. Tsurin, J. Turnau, E. Tzamariudaki, A. Uraev, Martin Urban, A. Usik, D. Utkin, S. Valkar, A. Valkarova, C. Vallee, P. Van Mechelen, N. Van Remortel, A. Vargas Trevino, Y. Vazdik, C. Veelken, A. Vest, S. Vinokurova, V. Volchinski, K. Wacker, J. Wagner, G. Weber, R. Weber, D. Wegener, C. Werner, N. Werner, M. Wessels, B. Wessling, G.-G. Winter, Ch. Wissing, E.-E. Woehrling, R. Wolf, E. Wunsch, S. Xella, W. Yan, V. Yeganov, J. Zacek, J. Zalesak, Zhen Zhang, A. Zhokin, H. Zohrabyan and F. Zomer

Abstract

Deep-inelastic positron-proton interactions at low values of Bjorken-x down to x \approx 4.10^-5 which give rise to high transverse momentum pi^0 mesons are studied with the H1 experiment at HERA. The inclusive cross section for pi^0 mesons produced at small angles with respect to the proton remnant (the forward region) is presented as a function of the transverse momentum and energy of the pi^0 and of the four-momentum transfer Q^2 and Bjorken-x. Measurements are also presented of the transverse energy flow in events containing a forward pi^0 meson. Hadronic final state calculations based on QCD models implementing different parton evolution schemes are confronted with the data

Topics: [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex]
Publisher: Springer Verlag (Germany)
Year: 2004
DOI identifier: 10.1140/epjc
OAI identifier: oai:HAL:in2p3-00023758v1
Provided by: Hal-Diderot
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