Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2001-06-28
Phys.Rev. D65 (2002) 074008
Physics
High Energy Physics
High Energy Physics - Phenomenology
12 pages, 12 figures, revtex, final version to be published in Phys. Rev. D. Corrected error in MRSA' distribution and modifie
Scientific paper
10.1103/PhysRevD.65.074008
We present a next-to-leading order (NLO) QCD analysis of unpolarized and polarized deeply virtual Compton scattering (DVCS) amplitudes, for two different input scenarios, in the $\bar{MS}$ scheme. We illustrate and discuss the size of the NLO effects and the behavior of the amplitudes in skewedness, $\zeta$, and photon virtuality, $Q^2$. In the unpolarized case, at fixed $Q^2$, we find a remarkable effective power-law behaviour in $\zeta$, akin to Regge factorization, over several orders of magnitude in $\zeta$. We also quantify the ratio of real to imaginary parts of the DVCS amplitudes and their sensitivity to changes of the factorization scale.
Freund Andreas
McDermott M. F.
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