Abstract
The study of O (αs ) QCD contributions to the timelike and spacelike virtual Compton scattering amplitudes in the generalized Bjorken scaling regime demonstrates that 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.
Highlights
The DVCS (and TCS) amplitudes are written in terms of Compton form factors (CFF) H, E and H, E , as : Aμν(ξ, t) =
A necessary step to extract information on gluon generalized parton distributions (GPDs) is to study [1] O(αs) QCD contributions to spacelike Deeply Virtual Compton Scattering (DVCS) : γ∗(qin)N(P) → γ(qout)N (P= P + ∆), q2in = −Q2, q2out = 0, t = ∆2, ξ = (P + P ) Q2 · (1)and to its crossed reaction, timelike Compton scattering (TCS) : γ(qin)N(P) → γ∗(qout)N
The DVCS amplitudes are written in terms of Compton form factors (CFF) H, E and H, E, as : Aμν(ξ, t) =
Summary
The DVCS (and TCS) amplitudes are written in terms of Compton form factors (CFF) H, E and H, E , as : Aμν(ξ, t) = 2 Gluonic effects to Compton form factors and to DVCS / TCS observables
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