Electroproduction of heavy quarkonia: significance of dipole orientation

Abstract

The differential cross section $d\sigma /d{q}^2$ of diffractive electroproduction of heavy quarkonia on protons is a sensitive study tool for the interaction dynamics within the dipole representation. Knowledge of the transverse momentum transfer $\vec{q}$ provides a unique opportunity to identify the reaction plane, due to a strong correlation between the directions of $\vec{q}$ and impact parameter $\vec{b}$. On top of that, the elastic dipole-proton amplitude is subject to a strong correlation between $\vec{b}$ and dipole orientation $\vec{r}$. Most of models for $b$-dependent dipole cross section either completely miss this information, or make unjustified assumptions. We perform calculations basing on a realistic model for $\vec{r}$-$\vec{b}$ correlation, which significantly affect the $q$-dependence of the cross section, in particular the ratio of ${\psi }^{\prime }(2S)$ to $J/\psi$ yields. We rely on realistic potential models for the heavy quarkonium wave function, and the Lorentz-boosted Schrödinger equation. Good agreement with data on $q$-dependent diffractive electroproduction of heavy quarkonia is achieved.

12 pages, 6 figures

References in corpus (14)

• Analysis of combined HERA data in the Impact-Parameter dependent Saturation model
• Diffractive Dijet Production and Wigner Distributions from the Color Glass Condensate
• Azimuthal anisotropy of direct photons
• Theoretical uncertainties in exclusive electroproduction S-wave heavy quarkonia
• Azimuthal Asymmetry of pions in pp and pA collisions
• Azimuthal Asymmetry of Prompt Photons in Nuclear Collisions
• Damping of forward neutrons in pp collisions
• Spin rotation effects in diffractive electroproduction of heavy quarkonia
• Inclusive prompt photon-jet correlations as a probe of gluon saturation in electron-nucleus scattering at small $x$
• Glue drops inside hadrons
• Survival of charmonia in a hot environment
• Production of Polarized Vector Mesons off Nuclei
• Ultra-peripheral nuclear collisions as a source of heavy quarkonia
• D-wave effects in heavy quarkonium production in ultraperipheral nuclear collisions

Cited by in corpus (5)

• Momentum transfer squared dependence of exclusive quarkonia photoproduction in UPCs
• Solutions to the Balitsky-Kovchegov equation including the dipole orientation
• Coherent photoproduction of heavy quarkonia on nuclei
• Measurement of the cross-section ratio ${\sigma }_{\psi (2S)}/{\sigma }_{J/\psi (1S)}$ in exclusive photoproduction at HERA
• Testing the double-logarithm asymptotic gluon density in ultraperipheral heavy ion collisions at the Large Hadron Collider