Exclusive vector meson production at high energies and gluon saturation

Néstor Armesto; Amir H. Rezaeian

Paper

Exclusive vector meson production at high energies and gluon saturation

Abstract

We systematically study exclusive diffractive (photo) production of vector mesons (

and

) off protons in high-energy collisions and investigate whether the production is a sensitive probe of gluon saturation. We confront saturation-based results for diffractive

and

production at HERA and

photoproduction with all available data including recent ones from HERA, ALICE and LHCb, finding good agreement. In particular, we show that the

-distribution of differential cross sections of photoproduction of vector mesons offers a unique opportunity to discriminate among saturation and non-saturation models. This is due to the emergence of a pronounced dip (or multiple dips) in the

-distribution of diffractive photoproduction of vector mesons at relatively large, but potentially accessible

that can be traced back to the unitarity features of colour dipole amplitude in the saturation regime. We show that in saturation models the dips in

-distribution recede towards lower

with decreasing mass of the vector meson, increasing energy or decreasing Bjorken-

, and decreasing virtuality

. We provide various predictions for exclusive (photo) production of different vector mesons including the ratio of

at HERA, the LHC, and future colliders.