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On the importance of gluon contributions to timelike and spacelike DVCS

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arxiv 1307.2936 v1 pith:2K37NXTJ submitted 2013-07-10 hep-ph hep-exnucl-exnucl-th

On the importance of gluon contributions to timelike and spacelike DVCS

classification hep-ph hep-exnucl-exnucl-th
keywords spaceliketimelikecontributionsalphaamplitudesattentionbjorkencases
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We emphasize how large O(\alpha_s) corrections to timelike and spacelike virtual Compton scattering amplitudes are in the generalized Bjorken scaling regime, and in particular the gluonic contributions, even in the medium energy range which will be studied intensely at JLab12 and in the COMPASS-II experiment at CERN. We stress that the timelike and spacelike cases are complementary and that their difference deserves much special attention.

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