Gluon dissociation of J/psi beyond the dipole approximation

TL;DR

This paper calculates the gluon dissociation cross section of J/psi beyond the dipole approximation, revealing a significant reduction in the cross section and discussing implications for J/psi dissociation at finite temperature.

Contribution

It introduces a full gluon wave function into the calculation, providing a more accurate estimate of the dissociation cross section beyond the commonly used dipole approximation.

Findings

Cross section reduced by about a factor of three at maximum.

Full wave function inclusion significantly alters dissociation predictions.

Implications for J/psi suppression in hot QCD matter.

Abstract

Using a nonrelativistic potential model, we calculate the cross section for the leading-order gluon dissociation of J/psi by including the full gluon wave function. We find that the resulting cross section as a function of gluon energy is reduced by about a factor of three at its maximum value compared to that calculated in the dipole approximation that is usually adopted in theoretical studies. The effect of the reduced cross section on the J/psi dissociation width at finite temperature is also discussed.