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18 papers · 2 filters
DVCS on the nucleon : study of the twist-3 effects
N. Kivel, M. V. Polyakov, M. Vanderhaeghen
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…
Angular distributions in hard exclusive production of pion pairs
B. Lehmann-Dronke, A. Schaefer, M. V. Polyakov +1
Using the leading order amplitudes of hard exclusive electroproduction of pion pairs we have analyzed the angular distribution of the two produced particles. At leading twist a pio…
Hyperon semileptonic decay constants and quark-spin content of the octet baryons
Hyun-Chul Kim, Michal Praszalowicz, Klaus Goeke
We present the recent investigation on the effect of the SU(3) symmetry breaking in the spin structure of the octet baryons.
Meson twist-4 parton distributions in terms of twist-2 distribution amplitudes at large Nc
N. -Y. Lee, P. V. Pobylitsa, M. V. Polyakov +1
We show that in the large N_c limit four-quark twist-4 distributions in the pion can be expressed in terms of twist-2 pion distribution amplitude. This allows us to compute the iso…
DVCS amplitude at tree level: Transversality, twist-3, and factorization
A. V. Radyushkin, C. Weiss
We study the virtual Compton amplitude in the generalized Bjorken region (q^2 -> Infinity, t small) in QCD by means of a light-cone expansion of the product of e.m. currents in str…
DVCS on the nucleon to the twist-3 accuracy
N. Kivel, M. V. Polyakov
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 fo…