期刊
JOURNAL OF HIGH ENERGY PHYSICS
卷 -, 期 12, 页码 -出版社
SPRINGER
DOI: 10.1007/JHEP12(2021)103
关键词
QCD Phenomenology
资金
- U.S. Department of Energy, Office of Science, Office of Nuclear Physics [DE-SC0020682]
- Center for Nuclear Femtography, Southeastern Universities Research Association, Washington D.C.
- Center for Nuclear Femtography, SURA, Washington DC
The study shows that different choices of light-cone vectors and gauges lead to higher-order kinematic corrections in the deeply virtual Compton scattering cross-section formula. Systematic investigation of these light-cone dependencies at JLab 12 GeV and future EIC kinematics helps in extracting Compton form factors and understanding cross-section measurements with higher-twist precision.
We study the deeply virtual Compton scattering cross-section in twist-two generalized parton distribution (GPD) approximation, and show that different choices of light-cone vectors and gauges for the final photon polarization will lead to different higher-order kinematical corrections to the cross-section formula. The choice of light-cone vectors affects kinematic corrections at the twist-three level, accounting for the differences between the cross-section formulas in the literature. On the other hand, kinematical corrections from higher-twist GPDs should eliminate the light-cone dependence at twist three. Those light-cone dependencies are studied systematically at JLab 12 GeV and future EIC kinematics. They serve as the intrinsic systematic uncertainties in extracting the Compton form factors through the cross-section formula. More importantly, they are also necessary for understanding cross-section measurements with higher-twist precision and to reconstruct higher-order Compton form factors.
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