Wilson lines - color charge densities correlators and the production of eta' in the CGC for pp and pA collisions

Abstract

We compute the inclusive differential cross section production of the pseudo-scalar meson eta' in high-energy proton-proton (pp) and proton-nucleus (pA) collisions. We use an effective coupling between gluons and eta' meson to derive a reduction formula that relates the eta' production to a field-strength tensor correlator. For pA collisions we take into account saturation effects on the nucleus side by using the Color Glass Condensate formalism to evaluate this correlator. We derive new results for Wilson line - color charges correlators in the McLerran-Venugopalan model needed in the computation of eta' production. The unintegrated parton distribution functions are used to characterize the gluon distribution inside protons. We show that in pp collisions, the cross section depends on the parametrization of unintegrated parton distribution functions and thus, it can be used to put constraints on these distributions. We also demonstrate that in pA collisions, the cross section is sensitive to saturation effects so it can be utilized to estimate the value of the saturation scale.

41 pages, 14 figures

References in corpus (5)

• Light projectile scattering off the Color Glass Condensate
• Forward hadron production in high energy pA collisions: from RHIC to LHC
• $pp\to pp{\eta }^{\prime }$ reaction at high energies
• Two-Gluon Production and Longitudinal Correlations in the Color Glass Condensate
• Tensor Meson Production in Proton-Proton Collisions from the Color Glass Condensate

Cited by in corpus (5)

• The role of the chiral anomaly in polarized deeply inelastic scattering II: Topological screening and transitions from emergent axion-like dynamics
• Physical characteristics of glasma from the earliest stage of relativistic heavy ion collisions
• The energy-momentum tensor at the earliest stage of relativistic heavy ion collisions
• Two-gluon production of $\varphi$ and ${\eta }^{\prime }$ mesons in proton-proton collisions at high energies
• Memory effect in Yang-Mills theory with an axion