Content area
Abstract
Measurements are presented of differential dijet cross sections in diffractive photoproduction (Q2<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.
Details
Title
Tests of QCD factorisation in the diffractive production of dijets in deep-inelastic scattering and photoproduction at HERA
Author
Aktas, A 1 ; Andreev, V 2 ; Anthonis, T 3 ; Antunovic, B 4 ; Aplin, S 1 ; Asmone, A 5 ; Astvatsatourov, A 3 ; Babaev, A 6 ; Backovic, S 7 ; Baghdasaryan, A 8 ; Baranov, P 2 ; Barrelet, E 9 ; Bartel, W 1 ; Baudrand, S 10 ; Beckingham, M 1 ; Begzsuren, K 11 ; Behnke, O 12 ; Behrendt, O 13 ; Belousov, A 2 ; Berger, N 14 ; Bizot, J C 10 ; M-O Boenig 13 ; Boudry, V 15 ; Bozovic-Jelisavcic, I 16 ; Bracinik, J 4 ; Brandt, G 12 ; Brinkmann, M 1 ; Brisson, V 10 ; Bruncko, D 17 ; Büsser, F W 18 ; Bunyatyan, A 19 ; Buschhorn, G 4 ; Bystritskaya, L 6 ; Campbell, A J 1 ; Avila, KB Cantun 20 ; Cassol-Brunner, F 21 ; Cerny, K 22 ; Cerny, V 23 ; Chekelian, V 4 ; Cholewa, A 1 ; Contreras, J G 20 ; Coughlan, JA 24 ; Cozzika, G 25 ; Cvach, J 26 ; Dainton, J B 27 ; Daum, K 28 ; de Boer, Y 6 ; Delcourt, B 10 ; M Del Degan 14 ; De Roeck, A 29 ; De Wolf, EA 3 ; Diaconu, C 21 ; Dodonov, V 30 ; Dubak, A 31 ; Eckerlin, G 1 ; Efremenko, V 6 ; Egli, S 32 ; Eichler, R 32 ; Eisele, F 12 ; Eliseev, A 2 ; Elsen, E 1 ; Essenov, S 6 ; Falkewicz, A 33 ; Faulkner, PJW 34 ; Favart, L 3 ; Fedotov, A 6 ; Felst, R 1 ; Feltesse, J 35 ; Ferencei, J 17 ; Finke, L 1 ; Fleischer, M 1 ; Flucke, G 18 ; Fomenko, A 2 ; Franke, G 1 ; Frisson, T 15 ; Gabathuler, E 27 ; Garutti, E 1 ; Gayler, J 1 ; Ghazaryan, S 8 ; Ginzburgskaya, S 6 ; Glazov, A 1 ; Glushkov, I 36 ; Goerlich, L 33 ; Goettlich, M 1 ; Gogitidze, N 2 ; Gorbounov, S 36 ; Gouzevitch, M 15 ; Grab, C 14 ; Greenshaw, T 27 ; Gregori, M 37 ; Grell, B R 1 ; Grindhammer, G 4 ; Habib, S 18 ; Haidt, D 1 ; Hansson, M 38 ; Heinzelmann, G 18 ; Helebrant, C 1 ; Henderson, RCW 39 ; Henschel, H 36 ; Herrera, G 40 ; Hildebrandt, M 32 ; Hiller, KH 36 ; Hoffmann, D 21 ; Horisberger, R 32 ; Hovhannisyan, A 8 ; Hreus, T 41 ; Hussain, S 37 ; Jacquet, M 10 ; Janssen, X 3 ; Jemanov, V 18 ; Jönsson, L 38 ; Johnson, D P 3 ; Jung, A W 42 ; Jung, H 1 ; Kapichine, M 43 ; Katzy, J 1 ; Kenyon, IR 34 ; Kiesling, C 4 ; Klein, M 36 ; Kleinwort, C 1 ; Klimkovich, T 1 ; Kluge, T 1 ; Knies, G 1 ; Knutsson, A 38 ; Korbel, V 1 ; Kostka, P 36 ; Kraemer, M 1 ; Krastev, K 1 ; Kretzschmar, J 36 ; Kropivnitskaya, A 6 ; Krüger, K 42 ; Landon, MPJ 37 ; Lange, W 36 ; Laštovička-Medin, G 7 ; Laycock, P 27 ; Lebedev, A 2 ; Leibenguth, G 14 ; Lendermann, V 42 ; Levonian, S 1 ; Lindfeld, L 44 ; Lipka, K 36 ; Liptaj, A 4 ; List, B 18 ; List, J 1 ; Loktionova, N 2 ; Lopez-Fernandez, R 40 ; Lubimov, V 6 ; A-I Lucaci-Timoce 1 ; Lueders, H 18 ; Lytkin, L 30 ; Makankine, A 43 ; Malinovski, E 2 ; Marage, P 3 ; Marti, L 1 ; Martisikova, M 1 ; H-U, Martyn 45 ; Maxfield, S J 27 ; Mehta, A 27 ; Meier, K 42 ; Meyer, AB 1 ; Meyer, H 46 ; Meyer, J 1 ; Michels, V 1 ; Mikocki, S 33 ; Milcewicz-Mika, I 33 ; Mladenov, D 47 ; Mohamed, A 27 ; Moreau, F 15 ; Morozov, A 43 ; Morris, J V 24 ; Mozer, MU 12 ; Müller, K 44 ; Murín, P 48 ; Nankov, K 47 ; Naroska, B 18 ; Naumann, T 36 ; Newman, PR 34 ; Niebuhr, C 1 ; Nikiforov, A 4 ; Nowak, G 33 ; Nowak, K 44 ; Nozicka, M 22 ; Oganezov, R 8 ; Olivier, B 4 ; Olsson, JE 1 ; Osman, S 38 ; Ozerov, D 6 ; Palichik, V 43 ; Panagoulias, I 49 ; Pandurovic, M 16 ; Papadopoulou, T 49 ; Pascaud, C 10 ; Patel, G D 27 ; Peng, H 1 ; Perez, E 25 ; Perez-Astudillo, D 20 ; Perieanu, A 1 ; Petrukhin, A 6 ; Picuric, I 7 ; Piec, S 36 ; Pitzl, D 1 ; Plačakytė, R 1 ; Povh, B 30 ; Prideaux, P 27 ; Rahmat, A J 27 ; Raicevic, N 7 ; Reimer, P 26 ; Rimmer, A 27 ; Risler, C 1 ; Rizvi, E 37 ; Robmann, P 44 ; Roland, B 3 ; Roosen, R 3 ; Rostovtsev, A 6 ; Rurikova, Z 1 ; Rusakov, S 2 ; Salvaire, F 1 ; Sankey, DPC 24 ; Sauter, M 14 ; Sauvan, E 21 ; Schätzel, S 1 ; Schmidt, S 1 ; Schmitt, S 1 ; Schmitz, C 44 ; Schoeffel, L 25 ; Schöning, A 14 ; H-C Schultz-Coulon 42 ; Sefkow, F 1 ; Shaw-West, R N 34 ; Sheviakov, I 2 ; Shtarkov, L N 2 ; Sloan, T 39 ; Smiljanic, I 16 ; Smirnov, P 2 ; Soloviev, Y 2 ; South, D 13 ; Spaskov, V 43 ; Specka, A 15 ; Steder, M 1 ; Stella, B 5 ; Stiewe, J 42 ; Stoilov, A 47 ; Straumann, U 44 ; Sunar, D 3 ; Sykora, T 3 ; Tchoulakov, V 43 ; Thompson, G 37 ; Thompson, P D 34 ; Toll, T 1 ; Tomasz, F 17 ; Traynor, D 37 ; Trinh, T N 21 ; Truöl, P 44 ; Tsakov, I 47 ; Tsipolitis, G 49 ; Tsurin, I 1 ; Turnau, J 33 ; Tzamariudaki, E 4 ; Urban, K 42 ; Usik, A 2 ; Utkin, D 6 ; Valkárová, A 22 ; Vallée, C 21 ; P Van Mechelen 3 ; A Vargas Trevino 1 ; Vazdik, Y 2 ; Vinokurova, S 1 ; Volchinski, V 8 ; Wacker, K 13 ; Weber, G 18 ; Weber, R 14 ; Wegener, D 13 ; Werner, C 12 ; Wessels, M 1 ; Wissing, C 1 ; Wolf, R 12 ; Wünsch, E 1 ; Xella, S 44 ; Yan, W 1 ; Yeganov, V 8 ; Žáček, J 22 ; Zálešák, J 26 ; Zhang, Z 10 ; Zhelezov, A 6 ; Zhokin, A 6 ; Zhu, Y C 1 ; Zimmermann, J 4 ; Zimmermann, T 14 ; Zohrabyan, H 8 ; Zomer, F 10
1 DESY, Hamburg, Germany
2 Lebedev Physical Institute, Moscow, Russia
3 Inter-University Institute for High Energies ULB-VUB, Universiteit Antwerpen, Brussels, Antwerpen, Belgium
4 Max-Planck-Institut für Physik, München, Germany
5 Dipartimento di Fisica Università di Roma Tre and INFN Roma 3, Roma, Italy
6 Institute for Theoretical and Experimental Physics, Moscow, Russia
7 Faculty of Science, University of Montenegro, Podgorica, Montenegro
8 Yerevan Physics Institute, Yerevan, Armenia
9 LPNHE, Universités Paris VI and VII, IN2P3-CNRS, Paris, France
10 LAL, Université de Paris-Sud 11, IN2P3-CNRS, Orsay, France
11 Institute of Physics and Technology of the Mongolian Academy of Sciences, Ulaanbaatar, Mongolia
12 Physikalisches Institut, Universität Heidelberg, Heidelberg, Germany
13 Institut für Physik, Universität Dortmund, Dortmund, Germany
14 Institut für Teilchenphysik, ETH, Zürich, Switzerland
15 LLR, Ecole Polytechnique, IN2P3-CNRS, Palaiseau, France
16 Vinca Institute of Nuclear Sciences, Belgrade, Serbia
17 Institute of Experimental Physics, Slovak Academy of Sciences, Košice, Slovak Republic
18 Institut für Experimentalphysik, Universität Hamburg, Hamburg, Germany
19 Max-Planck-Institut für Kernphysik, Heidelberg, Germany; Yerevan Physics Institute, Yerevan, Armenia
20 Departamento de Fisica Aplicada, CINVESTAV, Mérida, Yucatán, Mexico
21 CPPM, CNRS/IN2P3 - Univ. Mediterranee, Marseille, France
22 Faculty of Mathematics and Physics, Charles University, Praha, Czech Republic
23 Institute of Experimental Physics, Slovak Academy of Sciences, Košice, Slovak Republic; Comenius University, Bratislava, Slovak Republic
24 Rutherford Appleton Laboratory, Chilton, Didcot, UK
25 CE-Saclay, CEA, DSM/DAPNIA, Gif-sur-Yvette, France
26 Institute of Physics, Academy of Sciences of the Czech Republic, Praha, Czech Republic
27 Department of Physics, University of Liverpool, Liverpool, UK
28 Fachbereich C, Universität Wuppertal, Wuppertal, Germany; Rechenzentrum, Universität Wuppertal, Wuppertal, Germany
29 DESY, Hamburg, Germany; CERN, Geneva, Switzerland
30 Max-Planck-Institut für Kernphysik, Heidelberg, Germany
31 Faculty of Science, University of Montenegro, Podgorica, Montenegro; Max-Planck-Institut für Physik, München, Germany
32 Paul Scherrer Institut, Villigen, Switzerland
33 Institute for Nuclear Physics, Cracow, Poland
34 School of Physics and Astronomy, University of Birmingham, Birmingham, UK
35 CE-Saclay, CEA, DSM/DAPNIA, Gif-sur-Yvette, France; Helmholtz Humboldt Research Award, DESY and University Hamburg, Hamburg, Germany
36 DESY, Zeuthen, Germany
37 Queen Mary and Westfield College, London, UK
38 Physics Department, University of Lund, Lund, Sweden
39 Department of Physics, University of Lancaster, Lancaster, UK
40 Departamento de Fisica, CINVESTAV, Mérida, Mexico
41 Inter-University Institute for High Energies ULB-VUB, Universiteit Antwerpen, Brussels, Antwerpen, Belgium; University of P.J. Šafárik, Košice, Slovak Republic
42 Kirchhoff-Institut für Physik, Universität Heidelberg, Heidelberg, Germany
43 Joint Institute for Nuclear Research, Dubna, Russia
44 Physik-Institut der Universität Zürich, Zürich, Switzerland
45 I. Physikalisches Institut der RWTH, Aachen, Germany
46 Fachbereich C, Universität Wuppertal, Wuppertal, Germany
47 Institute for Nuclear Research and Nuclear Energy, Sofia, Bulgaria
48 Institute of Experimental Physics, Slovak Academy of Sciences, Košice, Slovak Republic; University of P.J. Šafárik, Košice, Slovak Republic
49 DESY, Hamburg, Germany; Physics Department, National Technical University, Athens, Greece
1 DESY, Hamburg, Germany
2 Lebedev Physical Institute, Moscow, Russia
3 Inter-University Institute for High Energies ULB-VUB, Universiteit Antwerpen, Brussels, Antwerpen, Belgium
4 Max-Planck-Institut für Physik, München, Germany
5 Dipartimento di Fisica Università di Roma Tre and INFN Roma 3, Roma, Italy
6 Institute for Theoretical and Experimental Physics, Moscow, Russia
7 Faculty of Science, University of Montenegro, Podgorica, Montenegro
8 Yerevan Physics Institute, Yerevan, Armenia
9 LPNHE, Universités Paris VI and VII, IN2P3-CNRS, Paris, France
10 LAL, Université de Paris-Sud 11, IN2P3-CNRS, Orsay, France
11 Institute of Physics and Technology of the Mongolian Academy of Sciences, Ulaanbaatar, Mongolia
12 Physikalisches Institut, Universität Heidelberg, Heidelberg, Germany
13 Institut für Physik, Universität Dortmund, Dortmund, Germany
14 Institut für Teilchenphysik, ETH, Zürich, Switzerland
15 LLR, Ecole Polytechnique, IN2P3-CNRS, Palaiseau, France
16 Vinca Institute of Nuclear Sciences, Belgrade, Serbia
17 Institute of Experimental Physics, Slovak Academy of Sciences, Košice, Slovak Republic
18 Institut für Experimentalphysik, Universität Hamburg, Hamburg, Germany
19 Max-Planck-Institut für Kernphysik, Heidelberg, Germany; Yerevan Physics Institute, Yerevan, Armenia
20 Departamento de Fisica Aplicada, CINVESTAV, Mérida, Yucatán, Mexico
21 CPPM, CNRS/IN2P3 - Univ. Mediterranee, Marseille, France
22 Faculty of Mathematics and Physics, Charles University, Praha, Czech Republic
23 Institute of Experimental Physics, Slovak Academy of Sciences, Košice, Slovak Republic; Comenius University, Bratislava, Slovak Republic
24 Rutherford Appleton Laboratory, Chilton, Didcot, UK
25 CE-Saclay, CEA, DSM/DAPNIA, Gif-sur-Yvette, France
26 Institute of Physics, Academy of Sciences of the Czech Republic, Praha, Czech Republic
27 Department of Physics, University of Liverpool, Liverpool, UK
28 Fachbereich C, Universität Wuppertal, Wuppertal, Germany; Rechenzentrum, Universität Wuppertal, Wuppertal, Germany
29 DESY, Hamburg, Germany; CERN, Geneva, Switzerland
30 Max-Planck-Institut für Kernphysik, Heidelberg, Germany
31 Faculty of Science, University of Montenegro, Podgorica, Montenegro; Max-Planck-Institut für Physik, München, Germany
32 Paul Scherrer Institut, Villigen, Switzerland
33 Institute for Nuclear Physics, Cracow, Poland
34 School of Physics and Astronomy, University of Birmingham, Birmingham, UK
35 CE-Saclay, CEA, DSM/DAPNIA, Gif-sur-Yvette, France; Helmholtz Humboldt Research Award, DESY and University Hamburg, Hamburg, Germany
36 DESY, Zeuthen, Germany
37 Queen Mary and Westfield College, London, UK
38 Physics Department, University of Lund, Lund, Sweden
39 Department of Physics, University of Lancaster, Lancaster, UK
40 Departamento de Fisica, CINVESTAV, Mérida, Mexico
41 Inter-University Institute for High Energies ULB-VUB, Universiteit Antwerpen, Brussels, Antwerpen, Belgium; University of P.J. Šafárik, Košice, Slovak Republic
42 Kirchhoff-Institut für Physik, Universität Heidelberg, Heidelberg, Germany
43 Joint Institute for Nuclear Research, Dubna, Russia
44 Physik-Institut der Universität Zürich, Zürich, Switzerland
45 I. Physikalisches Institut der RWTH, Aachen, Germany
46 Fachbereich C, Universität Wuppertal, Wuppertal, Germany
47 Institute for Nuclear Research and Nuclear Energy, Sofia, Bulgaria
48 Institute of Experimental Physics, Slovak Academy of Sciences, Košice, Slovak Republic; University of P.J. Šafárik, Košice, Slovak Republic
49 DESY, Hamburg, Germany; Physics Department, National Technical University, Athens, Greece
Pages
549-568
Publication year
2007
Publication date
Aug 2007
ISSN
14346044
e-ISSN
14346052
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
2293806462
Copyright
The European Physical Journal C is a copyright of Springer, (2007). All Rights Reserved.