Measurement of deeply virtual Compton scattering and its t-dependence at HERA

被引：126
作者：
Aaron, F. D.
Aktas, A.
Alexa, C.
Andreev, V.
Antunovic, B.
Aplin, S.
Asmone, A.
Astvatsatourov, A.
Backovic, S.
Baghdasaryan, A.
Baranov, P.
Barrelet, E.
Bartel, W.
Baudrand, S.
Beckingham, M.
Begzsuren, K.
Behnke, O. [1 ]
Behrendt, O.
Belousov, A.
Berger, N.
Bizot, J. C.
Boenig, M. O.
Boudry, V.
Bozovic-Jelisavcic, I.
Bracinik, J.
Brandt, G.
Brinkmann, M.
Brisson, V.
Bruncko, D.
Buesser, F. W.
Bunyatyan, A.
Buschhorn, G.
Bystritskaya, L.
Campbell, A. J.
Avila, K. B. Cantun
Cassol-Brunner, F.
Cerny, K.
Cerny, V.
Chekelian, V.
Cholewa, A.
Contreras, J. G.
Coughlan, J. A.
Cozzika, G.
Cvach, J.
Dainton, J. B.
Daum, K.
Deak, M.
de Boer, Y.
Delcourt, B.
Del Degan, M.
机构：
[1] I Phys Inst RWTH, Aachen, Germany
[2] Vinca Inst Nucl Sci, Belgrade, Serbia
[3] Univ Birmingham, Sch Phys & Astron, Birmingham, England
[4] Univ Antwerp, Interuniv Inst High Energies ULB VUB, Brussels, Antwerp, Belgium
[5] NIPNE, Bucharest, Romania
[6] Rutherford Appleton Lab, Didcot OX11 0QX, Oxon, England
[7] Inst Nucl Phys, Krakow, Poland
[8] Univ Dortmund, Inst Phys, Dortmund, Germany
[9] Joint Inst Nucl Res, Dubna, Russia
[10] CE Saclay, CEA, DSM DAPNIA, Gif Sur Yvette, France
[11] DESY, Hamburg, Germany
[12] Univ Hamburg, Inst Expt Phys, Hamburg, Germany
[13] Max Planck Inst Kernphys, Heidelberg, Germany
[14] Heidelberg Univ, Inst Phys, Heidelberg, Germany
[15] Heidelberg Univ, Kirchhoff Inst Phys, Heidelberg, Germany
[16] Slovak Acad Sci, Inst Expt Phys, Kosice, Slovakia
[17] Univ Lancaster, Dept Phys, Lancaster, England
[18] Univ Liverpool, Dept Phys, Liverpool L69 3BX, Merseyside, England
[19] Queen Mary Univ London, London E1 4NS, England
[20] Lund Univ, Dept Phys, Lund, Sweden
[21] Univ Aix Marseille 2, IN2P3, CNRS, CPPM, Marseille, France
来源：
PHYSICS LETTERS B | 2008年 / 659卷 / 04期
基金：
英国科学技术设施理事会;
关键词：
D O I：
10.1016/j.physletb.2007.11.093
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 collision data recorded with the H1 detector at HERA is presented. The analysed data sample corresponds to an integrated luminosity of 145 pb(-1). 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 vertical bar t vertical bar < 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. The measurements are compared to a NLO QCD calculation based on generalised parton distributions. In the context of the dipole approach, the geometric scaling property of the DVCS cross section is studied for different values of t.
引用
收藏
页码：796 / 806
页数：11
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