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Tests of QCD factorisation in the diffractive production of dijets in deep-inelastic scattering and photoproduction at HERA

Aktas, A.; Andreev, V.; Anthonis, T.; Antunovic, B.; Aplin, S.; Asmone, A.; Astvatsatourov, A.; Babaev, A.; Backovic, S. and Baghdasaryan, A., et al. (2007) In European Physical Journal C. Particles and Fields 51(3). p.549-568
Abstract
Measurements are presented of differential dijet cross sections in diffractive photoproduction (Q(2) < 0.01 GeV2) and deep-inelastic scattering processes (DIS, 4 < Q2 < 80 GeV2). The event topology is given by ep -> eXY, in which the system X, containing at least two jets, is separated from a leading low-mass baryonic system Y by a large rapidity gap. The dijet cross sections are compared with NLO QCD predictions based on diffractive parton densities previously obtained from a QCD analysis of inclusive diffractive DIS cross sections by H1. In DIS, the dijet data are well described, supporting the validity of QCD factorisation. The diffractive DIS dijet data are more sensitive to the diffractive gluon density at high fractional... (More)
Measurements are presented of differential dijet cross sections in diffractive photoproduction (Q(2) < 0.01 GeV2) and deep-inelastic scattering processes (DIS, 4 < Q2 < 80 GeV2). The event topology is given by ep -> eXY, in which the system X, containing at least two jets, is separated from a leading low-mass baryonic system Y by a large rapidity gap. The dijet cross sections are compared with NLO QCD predictions based on diffractive parton densities previously obtained from a QCD analysis of inclusive diffractive DIS cross sections by H1. In DIS, the dijet data are well described, supporting the validity of QCD factorisation. The diffractive DIS dijet data are more sensitive to the diffractive gluon density at high fractional parton momentum than the measurements of inclusive diffractive DIS. In photoproduction, the predicted dijet cross section has to be multiplied by a factor of approximately 0.5 for both direct and resolved photon interactions to describe the measurements. The ratio of measured dijet cross section to NLO prediction in photoproduction is a factor 0.5 +/- 0.1 smaller than the same ratio in DIS. This suppression is the first clear observation of QCD hard scattering factorisation breaking at HERA. The measurements are also compared to the two soft colour neutralisation models SCI and GAL. The SCI model describes diffractive dijet production in DIS but not in photoproduction. The GAL model fails in both kinematic regions. (Less)
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European Physical Journal C. Particles and Fields
volume
51
issue
3
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549 - 568
publisher
Springer
external identifiers
  • wos:000248390700004
  • scopus:34547200918
ISSN
1434-6044
DOI
10.1140/epjc/s10052-007-0325-4
language
English
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yes
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eec6f0e1-4b9a-4c12-a992-4b374a0e6712 (old id 647180)
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2007-12-04 16:20:47
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@article{eec6f0e1-4b9a-4c12-a992-4b374a0e6712,
  abstract     = {Measurements are presented of differential dijet cross sections in diffractive photoproduction (Q(2) &lt; 0.01 GeV2) and deep-inelastic scattering processes (DIS, 4 &lt; Q2 &lt; 80 GeV2). The event topology is given by ep -&gt; eXY, in which the system X, containing at least two jets, is separated from a leading low-mass baryonic system Y by a large rapidity gap. The dijet cross sections are compared with NLO QCD predictions based on diffractive parton densities previously obtained from a QCD analysis of inclusive diffractive DIS cross sections by H1. In DIS, the dijet data are well described, supporting the validity of QCD factorisation. The diffractive DIS dijet data are more sensitive to the diffractive gluon density at high fractional parton momentum than the measurements of inclusive diffractive DIS. In photoproduction, the predicted dijet cross section has to be multiplied by a factor of approximately 0.5 for both direct and resolved photon interactions to describe the measurements. The ratio of measured dijet cross section to NLO prediction in photoproduction is a factor 0.5 +/- 0.1 smaller than the same ratio in DIS. This suppression is the first clear observation of QCD hard scattering factorisation breaking at HERA. The measurements are also compared to the two soft colour neutralisation models SCI and GAL. The SCI model describes diffractive dijet production in DIS but not in photoproduction. The GAL model fails in both kinematic regions.},
  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 Baghdasaryan, A. and Baranov, P. and Barrelet, E. and Bartel, W. and Baudrand, S. and Beckingham, M. and Begzsuren, K. and Behnke, O. and Behrendt, O. and Belousov, A. and Berger, N. and Bizot, J. C. and Boenig, M.-O. and Boudry, V. and Bozovic-Jelisavcic, I. and Bracinik, J. and Brandt, G. and Brinkmann, M. and Brisson, V. and Bruncko, D. and Buesser, F. W. and Bunyatyan, A. and Buschhorn, G. and Bystritskaya, L. and Campbell, A. J. and Cantun Avila, K. B. and Cassol-Brunner, F. and Cerny, K. and Cerny, V. and Chekelian, V. and Cholewa, A. and Contreras, J. G. and Coughlan, J. A. and Cozzika, G. and Cvach, J. and Dainton, J. B. and Daum, K. and de Boer, Y. and Delcourt, B. and Del Degan, M. and De Roeck, A. 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 Eliseev, A. and Elsen, E. and Essenov, S. and Falkewicz, A. and Faulkner, P. J. W. and Favart, L. and Fedotov, A. and Felst, R. and Feltesse, J. and Ferencei, J. and Finke, L. and Fleischer, M. and Flucke, G. and Fomenko, A. and Franke, G. and Frisson, T. and Gabathuler, E. and Garutti, E. and Gayler, J. 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 Gouzevitch, M. and Grab, C. and Greenshaw, T. and Gregori, M. and Grell, B. R. and Grindhammer, G. and Habib, S. and Haidt, D. and Hansson, Magnus and Heinzelmann, G. and Helebrant, C. and Henderson, R. C. W. and Henschel, H. 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 Jacquet, M. and Janssen, X. and Jemanov, V. and Jönsson, Leif and Johnson, D. P. and Jung, A. W. and Jung, H. 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 Kraemer, M. and Krastev, K. and Kretzschmar, J. and Kropivnitskaya, A. and Krueger, K. and Landon, M. P. J. and Lange, W. 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 List, B. and List, J. and Loktionova, N. and Lopez-Fernandez, R. and Lubimov, V. and Lucaci-Timoce, A.-I. and Lueders, H. and Lytkin, L. and Makankine, A. and Malinovski, E. and Marage, P. and Marti, L. and Martisikova, M. and Martyn, H.-U. and Maxfield, S. J. and Mehta, A. and Meier, K. and Meyer, A. B. and Meyer, H. and Meyer, J. and Michels, V. and Mikocki, S. and Milcewicz-Mika, I. 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 Nowak, G. and Nowak, K. 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 Pandurovic, M. and Papadopoulou, T. and Pascaud, C. and Patel, G. D. and Peng, H. and Perez, E. and Perez-Astudillo, D. and Perieanu, A. and Petrukhin, A. and Picuric, I. and Piec, S. and Pitzl, D. and Placakyte, R. 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 Sauter, M. and Sauvan, E. and Schaetzel, S. and Schmidt, S. and Schmitt, S. and Schmitz, C. and Schoeffel, L. and Schoening, A. and Schultz-Coulon, H.-C. and Sefkow, F. and Shaw-West, R. N. and Sheviakov, I. and Shtarkov, L. N. and Sloan, T. and Smiljanic, I. and Smirnov, P. and Soloviev, Y. and South, D. and Spaskov, V. and Specka, A. and Steder, M. and Stella, B. and Stiewe, J. and Stoilov, A. and Straumann, U. and Sunar, D. and Sykora, T. and Tchoulakov, V. and Thompson, G. and Thompson, P. D. and Toll, T. and Tomasz, F. and Traynor, D. and Trinh, T. N. and Truoel, P. and Tsakov, I. and Tsipolitis, G. and Tsurin, I. and Turnau, J. and Tzamariudaki, E. and Urban, K. and Usik, A. and Utkin, D. and Valkarova, A. and Vallee, C. and Van Mechelen, P. and Trevino, A. Vargas and Vazdik, Y. and Vinokurova, S. and Volchinski, V. and Wacker, K. and Weber, G. and Weber, R. and Wegener, D. and Werner, C. and Wessels, M. 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        = {549--568},
  publisher    = {Springer},
  series       = {European Physical Journal C. Particles and Fields},
  title        = {Tests of QCD factorisation in the diffractive production of dijets in deep-inelastic scattering and photoproduction at HERA},
  url          = {http://dx.doi.org/10.1140/epjc/s10052-007-0325-4},
  volume       = {51},
  year         = {2007},
}