DVCS amplitude with kinematical twist-3 terms
نویسندگان
چکیده
منابع مشابه
Wandzura - Wilczek approximation for the twist - 3 DVCS amplitude
We present a derivation of Wandzura-Wilczek (WW) like relations for skewed par-ton distributions. It is demonstrated for photon-pion scattering that the skewed twist-3 parton distributions contributing to the DVCS amplitude have discontinuities at the points x = ±ξ in the WW approximation. This may lead to a violation of factorisation for the twist-3 DVCS amplitude with transverse polarization ...
متن کاملOn the Wandzura-Wilczek approximation for the twist-3 DVCS amplitude
We present a derivation of Wandzura-Wilczek (WW) like relations for skewed parton distributions. It is demonstrated for photon-pion scattering that for transverse photon polarization the skewed twist-3 parton distributions contributing to the DVCS amplitude have discontinuities at the points x = ±ξ in the WW approximation. Unless these discontinuities are cancelled by the neglected genuine high...
متن کاملDVCS on the nucleon to the twist - 3 accuracy
The amplitude of the deeply virtual Compton scattering off nucleon is computed to the twist-3 accuracy in the Wandzura-Wilczek (WW) approximation. The result is presented in the form which can be easily used for analysis of DVCS observables.
متن کاملDVCS on the nucleon : study of the twist - 3 effects
We estimate the size of the twist-3 effects on deeply virtual Compton scattering (DVCS) observables, in the Wandzura-Wilczek approximation. We present results in the valence region for the DVCS cross sections, charge asymmetries and single spin asymmetries, to twist-3 accuracy. PACS : 13.60.Fz; 12.38.Bx; 13.60.-r
متن کاملTwist-4 photon helicity-flip amplitude in DVCS on a nucleon in the Wandzura-Wilczek approximation
We 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, Q2 ≤ 10 Ge...
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ژورنال
عنوان ژورنال: Physics Letters B
سال: 2000
ISSN: 0370-2693
DOI: 10.1016/s0370-2693(00)01155-2