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1. Charged particle production in high Q(2) deep-inelastic scattering at HERA

Author

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, W. Bartel, S. Baudrand, M. Beckingham, K. Begzsuren, O. Behnke, O. Behrendt, A. Belousov, N. Berger, J.C. Bizot, M.-O. Boenig, V. Boudry, I. Bozovic-Jelisavcic, J. Bracinik, G. Brandt, M. Brinkmann, V. Brisson, D. Bruncko, F.W. Büsser, A. Bunyatyan, G. Buschhorn, L. Bystritskaya, A.J. Campbell, K.B. Cantun Avila, F. Cassol-Brunner, K. Cerny, V. Cerny, V. Chekelian, A. Cholewa, J.G. Contreras, J.A. Coughlan, G. Cozzika, J. Cvach, J.B. Dainton, K. Daum, M. Deak, Y. de Boer, B. Delcourt, M. Del Degan, J. Delvax, A. De Roeck, E.A. De Wolf, C. Diaconu, 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, J. Ferencei, L. Finke, M. Fleischer, A. Fomenko, G. Franke, T. Frisson, E. Gabathuler, J. Gayler, S. Ghazaryan, S. Ginzburgskaya, A. Glazov, I. Glushkov, L. Goerlich, M. Goettlich, N. Gogitidze, S. Gorbounov, M. Gouzevitch, C. Grab, T. Greenshaw, M. Gregori, 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, R. Horisberger, A. Hovhannisyan, T. Hreus, M. Jacquet, M.E. Janssen, X. Janssen, V. Jemanov, L. Jönsson, 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. Krüger, M.P.J. Landon, W. Lange, G. Laštovička-Medin, P. Laycock, A. Lebedev, G. Leibenguth, V. Lendermann, S. Levonian, G. Li, 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, A. Morozov, J.V. Morris, M.U. Mozer, K. Müller, P. Murín, 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, G.D. Patel, H. Peng, E. Perez, D. Perez-Astudillo, A. Perieanu, A. Petrukhin, I. Picuric, S. Piec, D. Pitzl, R. Plačakytė, 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, A. Schöning, 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, 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, D. Traynor, T.N. Trinh, P. Truöl, I. Tsakov, B. Tseepeldorj, G. Tsipolitis, I. Tsurin, J. Turnau, E. Tzamariudaki, K. Urban, D. Utkin, A. Valkárová, C. Vallée, 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. Wünsch, S. Xella, V. Yeganov, J. Žáček, J. Zálešák, Z. Zhang, A. Zhelezov, A. Zhokin, Y.C. Zhu, T. Zimmermann, H. Zohrabyan, F. Zomer, Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC), Laboratoire de l'Accélérateur Linéaire (LAL), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), H1, Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and (ukupan broj autora: 290)

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, 010308 nuclear & particles physics, Electron–positron annihilation, Perturbative QCD, FOS: Physical sciences, Elementary particle, HERA, Inelastic scattering, Deep inelastic scattering, 7. Clean energy, 01 natural sciences, Charged particle, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], ddc:530, High Energy Physics::Experiment, 010306 general physics
Abstract

The average charged track multiplicity and the normalised distribution of the scaled momentum, $\xp$, of charged final state hadrons are measured in deep-inelastic $\ep$ scattering at high $Q^2$ in the Breit frame of reference. The analysis covers the range of photon virtuality $100 < Q^2 < 20 000 \GeV^{2}$. Compared with previous results presented by HERA experiments this analysis has a significantly higher statistical precision and extends the phase space to higher $Q^{2}$ and to the full range of $\xp$. The results are compared with $e^+e^-$ annihilation data and with various calculations based on perturbative QCD using different models of the hadronisation process., 20 pages, 5 figures

Published
2007

2. Diffractive photoproduction of rho mesons with large momentum transfer at HERA

Author

Grzegorz Nowak, S. Egli, I. Sheviakov, S. Schmitt, J. E. Olsson, W. Bartel, D. Wegener, Y. Soloviev, L. Finke, F. P. Schilling, P. E. Reimer, C. Wigmore, Y.C. Zhu, M.-O. Boenig, A. Petrukhin, K. Daum, A. Vest, O. Behrendt, S. Vinokurova, F. W. Büsser, S. Mangano, Nicolas Berger, Christoph Grab, V. Efremenko, F. Tomasz, I. R. Kenyon, A. Zhelezov, S. Baudrand, G. Knies, Natasa Raicevic, S. Mikocki, S. Ghazaryan, P. Kostka, Adrian Perieanu, Gerhard Brandt, V. Spaskov, V. Volchinski, J. Kückens, K. Wacker, H. Meyer, Vincent Boudry, J. Zacek, Xavier Janssen, H. U. Martyn, K. H. Hiller, A. Baghdasaryan, R. C. W. Henderson, A. Rostovtsev, A. N. Morozov, D. Perez-Astudillo, P. Baranov, D. Lüke, E. Wünsch, Ilias Panagoulias, M. Gregori, J. Turnau, Dave Sankey, Hans-Christian Schultz-Coulon, Daniel Pitzl, D. Utkin, R.N. Shaw-West, J. Bähr, J-P. Meyer, D. Traynor, S. Hussain, O. Henshaw, D. South, Wolfgang Lange, A. Asmone, B. R. Grell, V. Korbel, I. Tsakov, V. Lubimov, M. Goettlich, Katja Krüger, V. Chekelian, G. D. Patel, A. M. Fomenko, Max Klein, A. Specka, F. Cassol-Brunner, Laurent Schoeffel, D.P. Johnson, Paul Laycock, L. Hajduk, V. Brisson, G. Thompson, T. J. Sloan, P.J.W. Faulkner, A.S. Belousov, Sergey Rusakov, A. D.R. Vargas Trevino, P. Truöl, A. Dubak, A. Falkewicz, E. Malinovski, Emmanuel Sauvan, D.P. Brown, Katerina Lipka, N. Malden, Tomas Hreus, R. Eichler, C. Pascaud, A. Lebedev, J. Gayler, R. Plačakyte, C. Gerlich, Murrough Landon, G. Grindhammer, F. Salvaire, Jan Kretzschmar, D. Haidt, Roland Horisberger, A. Valkárová, V. Tchoulakov, Anton Babaev, Y. Vazdik, M. Ismail, S. Gorbounov, N. Werner, Andrej Liptaj, Pierre Marage, Eram Rizvi, David Milstead, A. Mohamed, W. Yan, P. A. Smirnov, G. Heinzelmann, K. Krastev, K. Nankov, P. Prideaux, V. Dodonov, D. Mladenov, C. Werner, L. N. Shtarkov, J. Zimmermann, N. Loktionova, M. Peez, Stefania Xella, M. Urban, F. Eisele, I. Glushkov, H. Henschel, Theodora Papadopoulou, L. Lindfeld, J.C. Bizot, A. Hovhannisyan, J. V. Morris, P. Van Mechelen, Fabian Zomer, R. Weber, A. Bunyatyan, J.G. Contreras, J. Wagner, I. Tsurin, M. Jacquet, G. Laštovička-Medin, O. Behnke, I. Foresti, G. Cozzika, K. Desch, Guenter Eckerlin, P. D. Thompson, V. Yeganov, Dusan Bruncko, J. Zalesak, Stefan Valkar, L. Bystritskaya, B. Naroska, E. Gabathuler, Karel Cerny, I. Milcewicz-Mika, T. Kluge, F. Moreau, S. J. Aplin, S. Levonian, H. Zohrabyan, C. Schmitz, Y. H. Fleming, T. Greenshaw, Erika Garutti, Hannes Jung, Alexander Zhokin, J. Becker, Pavel Murin, A. Schöning, C. Vallée, Leif J. Jönsson, Benoit Roland, J. Ferencei, M. Martisikova, M. Ibbotson, Emmanuelle Perez, A. Glazov, Zhen Zhang, Sakar Osman, Claus Kleinwort, Ricardo Lopez-Fernandez, S. Essenov, Paul Newman, A. Rimmer, Gero Flucke, Laurent Favart, M. Kapichine, M. Nozicka, G. Herrera, S. Baumgartner, T. Laštovička, M. Beckingham, T. Anthonis, Andreas Meyer, C. Veelken, Matthias Ulrich Mozer, D. Meer, A. Usik, E. Barrelet, A. Knutsson, A. Fedotov, T. Klimkovich, B. Vujicic, B. Delcourt, Peter Robmann, Z. Rurikova, G. Weber, U. Straumann, E. A. De Wolf, Ch. Berger, S. Ginzburgskaya, C. Kiesling, Karlheinz Meier, R. Roosen, Thomas Naumann, A. Nikiforov, S. Schätzel, A. De Roeck, W.D. Dau, Georgios Tsipolitis, M. Fleischer, E. Tzamariudaki, A. J. Campbell, J. B. Dainton, C. Goyon, Y. de Boer, L. Lytkin, Cristinel Diaconu, V. Jemanov, N. Keller, V. Lendermann, Bogdan Povh, F. Sefkow, T. Zimmermann, A.-I. Lucaci-Timoce, C. Risler, Stephen Maxfield, S. Backovic, J. Stiewe, H. Lueders, R. Marshall, C. Gwilliam, Andrew Mehta, J. Bracinik, M. Hildebrandt, A. Aktas, N. Gogitidze, A. Makankine, Judith Katzy, B. Olivier, G. Buschhorn, D. Ozerov, B. Portheault, A. W. Jung, M. Wessels, M. Ellerbrock, G. Leibenguth, Bradley Cox, R. Wolf, B. Wessling, T. Frisson, I. Strauch, Philipp Fleischmann, S. Caron, D.K. Nikitin, K. Müller, B. Stella, Wolfram Erdmann, B. List, J. Cvach, Vladimir Palichik, Ewelina Lobodzinska, C. Wissing, Anna Kropivnitskaya, R. Felst, Thorsten Lux, L. Janauschek, R. Oganezov, K. Sedlák, V. Cerny, S. Schmidt, A. Astvatsatourov, V. Andreev, John A Coughlan, Magnus Hansson, L. Goerlich, Dirk L. Hoffmann, G. Franke, C. Niebuhr, Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC), Laboratoire de l'Accélérateur Linéaire (LAL), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Laboratoire Leprince-Ringuet (LLR), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), H1, Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Nuclear and High Energy Physics, Particle physics, Photon, Meson, Nuclear Theory, FOS: Physical sciences, 7. Clean energy, 01 natural sciences, Power law, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], ddc:530, 010306 general physics, Nuclear Experiment, Physics, 010308 nuclear & particles physics, Momentum transfer, Gamma ray, Perturbative QCD, HERA, Helicity, Physique des particules élémentaires, High Energy Physics::Experiment
Abstract

The diffractive photoproduction of ρ mesons, e p → e ρ Y, with large momentum transfer squared at the proton vertex, |t|, is studied with the H1 detector at HERA using an integrated luminosity of 20.1 pb-1. The photon-proton centre of mass energy spans the range 75 < W < 95 GeV, the photon virtuality is restricted to Q2 < 0.01 GeV2 and the mass MY of the proton remnant is below 5 GeV. The t dependence of the cross section is measured for the range 1.5 < | t | < 10.0 GeV2 and is well described by a power law, d σ / d | t | ∝ | t |- n. The spin density matrix elements, which provide information on the helicity structure of the interaction, are extracted using measurements of angular distributions of the ρ decay products. The data indicate a violation of s-channel helicity conservation, with contributions from both single and double helicity-flip being observed. The results are compared to the predictions of perturbative QCD models., Physics Letters B, 638 (5-6), ISSN:0370-2693, ISSN:0031-9163, ISSN:1873-2445

Published
2006

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