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Elastic J/psi production at HERA

Aktas, A.; Andreev, V.; Anthonis, T.; Antunovic, B.; Aplin, S.; Asmone, A.; Astvatsatourov, A.; Babaev, A.; Backovic, S. and Baehr, J., et al. (2006) In European Physical Journal C. Particles and Fields 46(3). p.585-603
Abstract
Cross sections for elastic production of J/psi mesons in photoproduction and electroproduction are measured in electron proton collisions at HERA using an integrated luminosity of 55 pb(-1). Results are presented for photon virtualities Q(2) up to 80 GeV2. The dependence on the photon-proton centre of mass energy W-gamma p is analysed in the range 40 <= W-gamma p <= 305 GeV in photoproduction and 40 <= W-gamma p <= 160 GeV in electroproduction. The W-gamma p dependences of the cross sections do not change significantly with Q(2) and can be described by models based on perturbative QCD. Within such models, the data show a high sensitivity to the gluon density of the proton in the domain of low Bjorken x and low Q(2).... (More)
Cross sections for elastic production of J/psi mesons in photoproduction and electroproduction are measured in electron proton collisions at HERA using an integrated luminosity of 55 pb(-1). Results are presented for photon virtualities Q(2) up to 80 GeV2. The dependence on the photon-proton centre of mass energy W-gamma p is analysed in the range 40 <= W-gamma p <= 305 GeV in photoproduction and 40 <= W-gamma p <= 160 GeV in electroproduction. The W-gamma p dependences of the cross sections do not change significantly with Q(2) and can be described by models based on perturbative QCD. Within such models, the data show a high sensitivity to the gluon density of the proton in the domain of low Bjorken x and low Q(2). Differential cross sections d sigma/dt, where t is the squared four-momentum transfer at the proton vertex, are measured in the range vertical bar t vertical bar < 1.2 GeV2 as functions of W-gamma p and Q(2). Effective Pomeron trajectories are determined for photoproduction and electroproduction. The J/psi production and decay angular distributions are consistent with s-channel helicity conservation. The ratio of the cross sections for longitudinally and transversely polarised photons is measured as a function of Q(2) and is found to be described by perturbative QCD based models. (Less)
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European Physical Journal C. Particles and Fields
volume
46
issue
3
pages
585 - 603
publisher
Springer Berlin Heidelberg
external identifiers
  • wos:000241559600003
  • scopus:33744793459
ISSN
1434-6044
DOI
10.1140/epjc/s2006-02519-5
language
English
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yes
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5f391ddb-ae13-4970-ac6e-875c4258f960 (old id 381932)
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2007-08-31 09:28:36
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@article{5f391ddb-ae13-4970-ac6e-875c4258f960,
  abstract     = {Cross sections for elastic production of J/psi mesons in photoproduction and electroproduction are measured in electron proton collisions at HERA using an integrated luminosity of 55 pb(-1). Results are presented for photon virtualities Q(2) up to 80 GeV2. The dependence on the photon-proton centre of mass energy W-gamma p is analysed in the range 40 &lt;= W-gamma p &lt;= 305 GeV in photoproduction and 40 &lt;= W-gamma p &lt;= 160 GeV in electroproduction. The W-gamma p dependences of the cross sections do not change significantly with Q(2) and can be described by models based on perturbative QCD. Within such models, the data show a high sensitivity to the gluon density of the proton in the domain of low Bjorken x and low Q(2). Differential cross sections d sigma/dt, where t is the squared four-momentum transfer at the proton vertex, are measured in the range vertical bar t vertical bar &lt; 1.2 GeV2 as functions of W-gamma p and Q(2). Effective Pomeron trajectories are determined for photoproduction and electroproduction. The J/psi production and decay angular distributions are consistent with s-channel helicity conservation. The ratio of the cross sections for longitudinally and transversely polarised photons is measured as a function of Q(2) and is found to be described by perturbative QCD based models.},
  author       = {Aktas, A. and Andreev, V. and Anthonis, T. and Antunovic, B. and Aplin, S. and Asmone, A. and Astvatsatourov, A. and Babaev, A. and Backovic, S. and Baehr, J. and Baghdasaryan, A. and Baranov, P. and Barrelet, E. and Bartel, W. and Baudrand, S. and Baumgartner, S. and Becker, J. and Beckingham, M. and Behnke, O. and Behrendt, O. and Belousov, A. and Berger, C. and Berger, N. and Bizot, J. C. and Boenig, M. -O. and Boudry, V. and Bracinik, J. and Brandt, G. and Brisson, V. and Bruncko, D. and Buesser, F. W. and Bunyatyan, A. and Buschhorn, G. and Bystritskaya, L. and Campbell, A. J. and Caron, S. and Cassol-Brunner, F. and Cerny, K. and Cerny, V. and Chekelian, V. and Contreras, J. G. and Coughlan, J. A. and Cox, B. E. and Cozzika, G. and Cvach, J. and Dainton', J. B. and Dau, W. D. and Daum, K. and de Boer, Y. and Delcourt, B. and Del Degan, M. and De Roeck, A. and Desch, K. and De Wolf, E. A. and Diaconu, C. and Dodonov, V. and Dubak, A. and Eckerlin, G. and Efremenko, V. and Egli, S. and Eichler, R. and Eisele, F. and Ellerbrock, M. and Elsen, E. and Erdmann, W. and Essenov, S. and Falkewicz, A. and Faulkner, P. J. W. and Favart, L. and Fedotov, A. and Felst, R. and Ferencei, J. and Finke, L. and Fleischer, M. and Fleischmann, P. and Flucke, G. and Fomenko, A. and Foresti, I. and Franke, G. and Frisson, T. and Gabathuler, E. and Garutti, E. and Gayler, J. and Gerlich, C. and Ghazaryan, S. and Ginzburgskaya, S. and Glazov, A. and Glushkov, I. and Goerlich, L. and Goettlich, M. and Gogitidze, N. and Gorbounov, S. and Goyon, C. and Grab, C. and Greenshaw, T. and Gregori, M. and Grell, B. R. and Grindhammer, G. and Gwilliam, C. and Haidt, D. and Hajduk, L. and Hansson, Magnus and Heinzelmann, G. and Henderson, R. C. W. and Henschel, H. and Henshaw, O. and Herrera, G. and Hildebrandt, M. and Hiller, K. H. and Hoffmann, D. and Horisberger, R. and Hovhannisyan, A. and Hreus, T. and Hussain, S. and Ibbotson, M. and Ismail, M. and Jacquet, M. and Janauschek, L. and Janssen, X. and Jemanov, V. and Jönsson, Leif and Johnson, D. P. and Jung, A. W. and Jung, Hannes and Kapichine, M. and Katzy, J. and Kenyon, I. R. and Kiesling, C. and Klein, M. and Kleinwort, C. and Klimkovich, T. and Kluge, T. and Knies, G. and Knutsson, Albert and Korbel, V. and Kostka, P. and Krastev, K. and Kretzschmar, J. and Kropivnitskaya, A. and Krueger, K. and Kueckens, J. and Landon, M. P. J. and Lange, W. and Lastovicka, T. and Lastovicka-Medin, G. and Laycock, P. and Lebedev, A. and Leibenguth, G. and Lendermann, V. and Levonian, S. and Lindfeld, L. and Lipka, K. and Liptaj, A. and Listo, B. and List, J. and Lobodzinska, E. and Loktionova, N. and Lopez-Fernandez, R. and Lubimov, V. and Lucaci-Timoce, A. -I. and Lueders, H. and Lueke, D. and Lux, T. and Lytkin, L. and Makankine, A. and Malden, N. and Malinovski, E. and Mangano, S. and Marage, P. and Marshall, R. and Martisikova, M. and Martyn, H. -U. and Maxfield, S. J. and Meer, D. and Mehta, A. and Meier, K. and Meyer, A. B. and Meyer, H. and Meyer, J. and Mikocki, S. and Milcewicz-Mika, I. and Milstead, D. and Mladenov, D. and Mohamed, A. and Moreau, F. and Morozov, A. and Morris, J. V. and Mozer, M. U. and Mueller, K. and Murin, P. and Nankov, K. and Naroska, B. and Naumann, T. and Newman, P. R. and Niebuhr, C. and Nikiforov, A. and Nikitin, D. and Nowak, G. and Nozicka, M. and Oganezov, R. and Olivier, B. and Olsson, J. E. and Osman, Sakar and Ozerov, D. and Palichik, V. and Panagoulias, I. and Papadopoulou, T. and Pascaud, C. and Patel, G. D. and Peez, M. and Perez, E. and Perez-Astudillo, D. and Perieanu, A. and Petrukhin, A. and Pitzl, D. and Placakyte, R. and Portheault, B. and Povh, B. and Prideaux, P. and Rahmat, A. J. and Raicevic, N. and Reimer, P. and Rimmer, A. and Risler, C. and Rizvi, E. and Robmann, P. and Roland, B. and Roosen, R. and Rostovtsev, A. and Rurikova, Z. and Rusakov, S. and Salvaire, F. and Sankey, D. P. C. and Sauvan, E. and Schaetzel, S. and Schilling, F. -P. and Schmidt, D. and Schmidt, S. and Schmitt, S. and Schmitz, C. and Schoeffel, L. and Schoening, A. and Schultz-Coulon, H. -C. and Sedlak, K. and Sefkow, F. and Shaw-West, R. N. and Sheviakov, I. and Shtarkov, L. N. and Sloan, T. and Smirnov, P. and Soloviev, Y. and South, D. and Spaskov, V. and Specka, A. and Stella, B. and Stiewe, J. and Strauch, I. and Straumann, U. and Tchoulakov, V. and Thompson, G. and Thompson, P. D. and Tomasz, F. and Traynor, D. and Truoel, P. and Tsakov, I. and Tsipolitis, G. and Tsurin, I. and Turnau, J. and Tzamariudaki, E. and Urban, M. and Usik, A. and Utkin, D. and Valkarova, A. and Vallee, C. and Van Mechelen, P. and Trevino, A. Vargas and Vazdik, Y. and Veelken, C. and Vest, A. and Vinokurova, S. and Volchinski, V. and Wacker, K. and Wagner, J. and Weber, G. and Weber, R. and Wegener, D. and Werner, C. and Wessels, M. and Wessling, B. and Wigmore, C. and Wissing, C. and Wolf, R. and Wuensch, E. and Xella, S. and Yan, W. and Yeganov, V. and Zacek, J. and Zalesak, J. and Zhang, Z. and Zhelezov, A. and Zhokin, A. and Zhu, Y. C. and Zimmermann, J. and Zimmermann, T. and Zohrabyan, H. and Zomer, F.},
  issn         = {1434-6044},
  language     = {eng},
  number       = {3},
  pages        = {585--603},
  publisher    = {Springer Berlin Heidelberg},
  series       = {European Physical Journal C. Particles and Fields},
  title        = {Elastic J/psi production at HERA},
  url          = {http://dx.doi.org/10.1140/epjc/s2006-02519-5},
  volume       = {46},
  year         = {2006},
}