Next-to-leading-power kinematic corrections to DVCS: a scalar target

Autor:	Braun, V. M., Ji, Yao, Manashov, A. N.
Jazyk:	angličtina
Rok vydání:	2022
Předmět:	target mass correction electromagnetic helicity amplitude analysis kinematics factorization deeply virtual Compton scattering coherence higher-order 0 nucleus operator twist target mass mass correction operator product expansion perturbation theory
DOI:	10.3204/pubdb-2022-06473
Popis:	Using the recent results on the contributions of descendants of the leading twist operators to the operator product expansion of two electromagnetic currents we derive explicit expressions for the kinematic finite-$t$ and target mass corrections to the DVCS helicity amplitudes to the $1/Q^4$ power accuracy. The cancellation of IR divergences for kinematic corrections is demonstrated to all powers in the leading order of perturbation theory. We also argue that target mass corrections in the coherent DVCS from nuclei are small and do not invalidate the factorization theorem.
Databáze:	OpenAIRE
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