Two-loop coefficient function for DVCS: vector contributions
Keyword(s):
Abstract Using the approach based on conformal symmetry we calculate the two-loop coefficient function for the vector flavor-nonsinglet contribution to deeply-virtual Compton scattering (DVCS). The analytic expression for the coefficient function in momentum fraction space is presented in the $$ \overline{\mathrm{MS}} $$ MS ¯ scheme. The corresponding next-to-next-to-leading order correction to the Compton form factor ℋ for a simple model of the generalized parton distribution appears to be rather large: a factor two smaller than the next-to-leading order correction, approximately ∼ 10% of the tree level result in the bulk of the kinematic range, for Q2 = 4 GeV2.
2000 ◽
Vol 474
(1-2)
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pp. 163-169
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2008 ◽
Vol 794
(1-2)
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pp. 244-323
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2007 ◽
Vol 648
(2-3)
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pp. 186-194
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Keyword(s):
2002 ◽
Vol 23
(4)
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pp. 651-674
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