Twist-4 photon helicity-flip amplitude in DVCS on a nucleon in the Wandzura-Wilczek approximation

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dc.creatorKivel, N.
dc.creatorMankiewicz, L.
dc.date2001-06-28
dc.date2001-07-12
dc.date.accessioned2026-07-07T12:26:17Z
dc.date.available2026-07-07T12:26:17Z
dc.descriptionWe computed twist-4 part of the photon spin-flip amplitude in deeply virtual Compton scattering on a nucleon in the Wandzura-Wilczek approximation. We found a factorizable contribution, which arises from photon scattering on quarks with non-zero angular momentum along the collision axis. As the genuine twist-2 amplitude arises at the NLO, for moderate virtualities of the hard photon, $Q^2 \le 10$ GeV$^2$, kinematical twist-4 correction can give numerically important contribution to the photon helicity-flip amplitude.
dc.description17 pages, 2 figures, added qualitative estimate of the magnitude of twist-4 correction which seems to be large
dc.identifierhttps://arxiv.org/abs/hep-ph/0106329
dc.identifierhttp://arxiv.org/abs/hep-ph/0106329
dc.identifierEur.Phys.J.C21:621-629,2001
dc.identifierdoi:10.1007/s100520100760
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/214833
dc.subjectHigh Energy Physics - Phenomenology
dc.titleTwist-4 photon helicity-flip amplitude in DVCS on a nucleon in the Wandzura-Wilczek approximation
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