Coherent photoproduction of heavy quarkonia on nuclei

Abstract

The differential cross section of coherent photo-production of heavy quarkonia on nuclear targets is calculated within the QCD color dipole formalism. The higher-twist nuclear shadowing corresponding to the $\bar{Q}Q$ Fock component of the photon, is calculated including the correlation between dipole orientation $\vec{r}$ and impact parameter of a collision $\vec{b}$, which is related to the transverse momentum transfer via Fourier transform. We also included the leading twist gluon shadowing corresponding to higher Fock components of the photon containing gluons, which have specifically short coherence time, especially for multi-gluon components, even at very high energies. The contribution of such fluctuating gluonic dipole is calculated employing the path-integral technique. Our results are in good agreement with recent ALICE data on charmonium production in ultra-peripheral nuclear collisions.

11 pages including 3 figures. Some typos and misprints have been removed

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Cited by in corpus (3)

• Testing the double-logarithm asymptotic gluon density in ultraperipheral heavy ion collisions at the Large Hadron Collider
• Coherent photo- and electroproduction of charmonia on nuclear targets revisited: Green function formalism
• Coherent photoproduction of light vector mesons off nuclear targets in the dipole picture