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Resolving kinematic ambiguities in QCD predictions for Deeply Virtual Compton Scattering

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arxiv 1407.0815 v1 pith:7BGDSRRE submitted 2014-07-03 hep-ph nucl-th

V. M. Braun , A. N. Manashov , D. Mueller , B. Pirnay This is my paper · ORCID
classification hep-phnucl-th
keywords comptoncorrectionsdeeplyframepredictionsreferencescatteringused
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

The existing QCD predictions for the Deeply Virtual Compton Scattering (DVCS) depend on the convention used for the skewedness parameter and on the reference frame used to define helicity amplitudes. These ambiquities are formally power-suppressed but numerically significant. They are cancelled by finite-$t$ and target mass corrections that have been calculated recently to the $1/Q^2$ accuracy. It turns out that these corrections can be minimized, at least for unpolarized observables, by choosing a specific reference frame where longitudinal directions are defined by the photon momenta.

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Cited by 1 Pith paper

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  1. Kinematic power corrections to DVCS to twist-six accuracy

    hep-ph 2025-01 accept novelty 8.0 of 10

    Complete kinematic power corrections up to twist-6 are derived for nucleon DVCS, and the series converges best when organized in powers of 1/(Q²+t).

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