logo cctval 2018 logo utfsm 2018

header area inv 1

area1 480

area1 320

Theoretical Particle Physics

Publications

Exclusive vector meson production at high energies and gluon saturation

Publicaciones

Exclusive vector meson production at high energies and gluon saturation

Research areas:

Física Teórica de Partículas

Year:

2014

Type of Publication:

In Proceeding

Authors:

  • Amir Rezaeian
  • Nestor Armesto

Journal:

Phys.Rev.

Volume:

D90

Pages:

12

Abstract:

We systematically study exclusive diffractive (photo) production of vector mesons (J/ψ, ψ(2s), ϕ and ρ) 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 ψ(2s) and ρ production at HERA and J/ψ photoproduction with all available data including recent ones from HERA, ALICE and LHCb, finding good agreement. In particular, we show that the t-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 t-distribution of diffractive photoproduction of vector mesons at relatively large, but potentially accessible |t| 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 t-distribution recede towards lower |t| with decreasing mass of the vector meson, increasing energy or decreasing Bjorken-x, and decreasing virtuality Q. We provide various predictions for exclusive (photo) production of different vector mesons including the ratio of ψ(2s)/J/ψ at HERA, the LHC, and future colliders.

[Volver]