Gluon GPDs and Exclusive Photoproduction of a Quarkonium in Forward Region
arXiv:1804.05293 · doi:10.1140/epjc/s10052-019-7298-y
Abstract
Forward photoproduction of can be used to extract Generalized Parton Distributions(GPD's) of gluons. We analyze the process at twist-3 level and study relevant classifications of twist-3 gluon GPD's. At leading power or twist-2 level the produced is transversely polarized. We find that at twist-3 the produced is longitudinally polarized. Our study shows that in high energy limit the twist-3 amplitude is only suppressed by the inverse power of the heavy quark mass relatively to the twist-2 amplitude. This indicates that the power correction to the cross-section of unpolarized can have a sizeable effect. We have also derived the amplitude of the production of at twist-3, but the result contains end-point singularities. The production of other quarkonia has been briefly discussed.
arXiv commentDiscussions of results are added
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- Signature of the gluon orbital angular momentum
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