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

Aaron, F. D., Martin, M. A., Alexa, C., Alimujiang, K., Andreev, V., Antunovic, B., Backovic, S., Baghdasaryan, A., Barrelet, E., Bartel, W., Begzsuren, K., Belousov, A., Bizot, J. C., Boudry, V., Bozovic-Jelisavcic, I., Bracinik, J., Brandt, G., Brinkmann, M., Brisson, V., Bruncko, D., Li, G. and H1 Collaboration 2009, Deeply virtual Compton scattering and its beam charge asymmetry in e±p collisions at HERA, Physics letters b, vol. 681, no. 5, pp. 391-399, doi: 10.1016/j.physletb.2009.10.035.

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Title Deeply virtual Compton scattering and its beam charge asymmetry in e±p collisions at HERA
Author(s) Aaron, F. D.
Martin, M. A.
Alexa, C.
Alimujiang, K.
Andreev, V.
Antunovic, B.
Backovic, S.
Baghdasaryan, A.
Barrelet, E.
Bartel, W.
Begzsuren, K.
Belousov, A.
Bizot, J. C.
Boudry, V.
Bozovic-Jelisavcic, I.
Bracinik, J.
Brandt, G.
Brinkmann, M.
Brisson, V.
Bruncko, D.
Li, G.ORCID iD for Li, G. orcid.org/0000-0003-1583-641X
H1 Collaboration
Journal name Physics letters b
Volume number 681
Issue number 5
Start page 391
End page 399
Total pages 9
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2009-11-16
ISSN 0370-2693
Summary A measurement of elastic deeply virtual Compton scattering γ * p → γ p using e + p and e - p collision data recorded with the H1 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 γ * p system in the kinematic domain 6.5 < Q 2 < 80 GeV 2, 30 < W < 140 GeV and | t | < 1 GeV 2, 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 Bjorken 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. © 2009 Elsevier B.V.
Language eng
DOI 10.1016/j.physletb.2009.10.035
Indigenous content off
Field of Research 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2009, Elsevier B.V.
Persistent URL http://hdl.handle.net/10536/DRO/DU:30125329

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