Timelike vs Spacelike DVCS from JLab, Compass to Ultraperipheral Collisions and AFTER@LHC§

H. Moutarde1, B. Pire2, F. Sabatié1, L. Szymanowski*, 3, J. Wagner3
1 Irfu-SPhN, CEA, Saclay, France
2 CPhT, École Polytechnique, CNRS, 91128 Palaiseau, France
3 National Centre for Nuclear Research (NCBJ), Warsaw, Poland

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© Moutarde; Licensee Bentham Open.

open-access license: This is an open access article licensed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted, non-commercial use, distribution and reproduction in any medium, provided the work is properly cited.

* Address correspondence to this author at the National Centre for Nuclear Research (NCBJ), Warsaw, Poland; E-mail:
§ Presented at the Low x workshop, May 30 - June 4 2013, Rehovot and Eilat, Israel.


Timelike and spacelike virtual Compton scattering in the generalized Bjorken scaling regime are complementary tools to access generalized parton distributions. We stress that the gluonic contributions are by no means negligible, even in the medium energy range which will be studied intensely at JLab12 and in the COMPASS-II experiment at CERN. Ultraperipheral collisions with proton or ion beams may also be used at RHIC and at collider or fixed target experiments at LHC.

Keywords:: Deeply virtual Compton scattering, Generalized Parton Distributions, LHC, timelike Compton scattering, Ultraperipheral collisions.