Deeply virtual Compton scattering and its beam charge asymmetry in e±p collisions at HERA

被引:85
作者
Aaron, F. D. [7 ,44 ]
Martin, M. Aldaya [13 ]
Alexa, C. [7 ]
Alimujiang, K. [13 ]
Andreev, V. [26 ]
Antunovic, B. [13 ]
Backovic, S.
Baghdasaryan, A. [41 ]
Barrelet, E. [29 ,30 ]
Bartel, W. [13 ]
Begzsuren, K. [38 ]
Belousov, A. [26 ]
Bizot, J. C. [28 ]
Boudry, V. [31 ]
Bozovic-Jelisavcic, I. [3 ]
Bracinik, J. [4 ]
Brandt, G. [13 ]
Brinkmann, M. [14 ]
Brisson, V. [28 ]
Bruncko, D. [17 ]
Bunyatyan, A. [15 ,41 ]
Buschhorn, G. [27 ]
Bystritskaya, L. [25 ]
Campbell, A. J. [13 ]
Avila, K. B. Cantun [23 ]
Cerny, K. [34 ]
Cerny, V. [17 ,45 ]
Chekelian, V. [27 ]
Cholewa, A. [13 ]
Contreras, J. G. [23 ]
Coughlan, J. A. [8 ]
Cozzika, G. [12 ]
Cvach, J. [33 ]
Dainton, J. B. [19 ]
Daum, K. [40 ,46 ]
Deak, M. [13 ]
de Boer, Y. [13 ]
Delcourt, B. [28 ]
Del Degan, M. [43 ]
Delvax, J. [5 ,6 ]
De Wolf, E. A. [5 ,6 ]
Diaconu, C. [22 ]
Dodonov, V. [15 ]
Dossanov, A. [27 ]
Dubak, A. [27 ,32 ]
Eckerlin, G. [13 ]
Efremenko, V. [25 ]
Egli, S. [39 ]
Eliseev, A. [26 ]
Elsen, E. [13 ]
机构
[1] Heidelberg Univ, Kirchhoff Inst Phys, Heidelberg, Germany
[2] Rhein Westfal TH Aachen, Inst Phys 1, D-5100 Aachen, Germany
[3] Vinca Inst Nucl Sci, Belgrade, Serbia
[4] Univ Birmingham, Sch Phys & Astron, Birmingham, W Midlands, England
[5] Interuniv Inst High Energies ULB VUB, Brussels, Belgium
[6] Univ Antwerp, B-2020 Antwerp, Belgium
[7] NIPNE, Bucharest, Romania
[8] Rutherford Appleton Lab, Didcot OX11 0QX, Oxon, England
[9] Inst Nucl Phys, Krakow, Poland
[10] TU Dortmund, Inst Phys, Dortmund, Germany
[11] Joint Inst Nucl Res, Dubna, Russia
[12] CE Saclay, DSM Irfu, CEA, Gif Sur Yvette, France
[13] DESY, D-2000 Hamburg, Germany
[14] Univ Hamburg, Inst Expt Phys, Hamburg, Germany
[15] Max Planck Inst Kernphys, D-69117 Heidelberg, Germany
[16] Heidelberg Univ, Inst Phys, D-6900 Heidelberg, Germany
[17] Slovak Acad Sci, Inst Expt Phys, Kosice 04353, Slovakia
[18] Univ Lancaster, Dept Phys, Lancaster, England
[19] Univ Liverpool, Dept Phys, Liverpool L69 3BX, Merseyside, England
[20] Queen Mary Univ London, London E1 4NS, England
[21] Lund Univ, Dept Phys, Lund, Sweden
[22] Univ Mediterranee, IN2P3, CNRS, CPPM, Marseille, France
[23] CINVESTAV, Dept Fis Aplicada, Merida, Yucatan, Mexico
[24] CINVESTAV, Dept Fis, Merida, Yucatan, Mexico
[25] Inst Theoret & Expt Phys, Moscow 117259, Russia
[26] PN Lebedev Phys Inst, Moscow 117924, Russia
[27] Max Planck Inst Phys & Astrophys, D-80805 Munich, Germany
[28] Univ Paris 11, CNRS, LAL, IN2P3, F-91405 Orsay, France
[29] Univ Paris 06, LPNHE, Palaiseau, France
[30] Univ Paris 07, IN2P3, CNRS, Palaiseau, France
[31] Ecole Polytech, CNRS, IN2P3, LLR, F-91128 Palaiseau, France
[32] Univ Montenegro, Fac Sci, Podgorica, Montenegro
[33] Acad Sci Czech Republ, Inst Phys, Prague, Czech Republic
[34] Charles Univ Prague, Fac Math & Phys, Prague, Czech Republic
[35] Univ Roma Tre, Dipartimento Fis, Rome, Italy
[36] INFN Roma 3, Rome, Italy
[37] Bulgarian Acad Sci, Inst Nucl Res & Nucl Energy, Sofia, Bulgaria
[38] Mongolian Acad Sci, Inst Phys & Technol, Ulaanbaatar, Mongolia
[39] Paul Scherrer Inst, Villigen, Switzerland
[40] Univ Wuppertal, Fachbereich C, Wuppertal, Germany
[41] Yerevan Phys Inst, Yerevan 375036, Armenia
[42] DESY, Zeuthen, Germany
[43] ETH, Inst Teilchenphys, Zurich, Switzerland
[44] Univ Bucharest, Fac Phys, Bucharest, Romania
[45] Comenius Univ, Bratislava, Slovakia
[46] Univ Wuppertal, Rechenzentrum, Wuppertal, Germany
[47] Safarik Univ, Kosice, Slovakia
[48] Natl Tech Univ Athens, Dept Phys, GR-15773 Athens, Greece
[49] CERN, Geneva, Switzerland
[50] Ulaanbaatar Univ, Ulaanbaatar, Mongolia
基金
瑞士国家科学基金会; 英国科学技术设施理事会; 俄罗斯基础研究基金会;
关键词
GENERALIZED PARTON DISTRIBUTIONS; ELECTROPRODUCTION; CALORIMETER; DETECTOR;
D O I
10.1016/j.physletb.2009.10.035
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
A measurement of elastic deeply virtual Compton scattering gamma*p --> gamma p using e(+) p and e(-) p collision data recorded with the HI detector at HERA is presented. The analysed data sample corresponds to an integrated luminosity of 306 pb(-1), almost equally shared between both beam charges. The cross section is measured as a function of the virtuality Q(2) of the exchanged photon and the centre-of-mass energy W of the gamma*p system in the kinematic domain 6.5 < Q(2) < 80 GeV2, 30 < W < 140 GeV and |t| < 1 GeV2, where t denotes the squared momentum transfer at the proton vertex. The cross section is determined differentially in t for different Q(2) and W values and exponential t-slope parameters are derived. Using e(+) p and e(-) p data samples, a beam charge asymmetry is extracted for the first time in the low Biorken x kinematic domain. The observed asymmetry is attributed to the interference between Bethe-Heitler and deeply virtual Compton scattering processes. Experimental results are discussed in the context of two different models, one based on generalised parton distributions and one based on the dipole approach. (C) 2009 Elsevier B.V. All rights reserved.
引用
收藏
页码:391 / 399
页数:9
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