The effect of gluon condensate on imaginary potential and thermal width from holography

TL;DR

Using holography, this paper investigates how gluon condensate influences the imaginary potential and thermal width of heavy quarkonium, revealing that higher condensate levels facilitate quarkonium dissociation at fixed temperature.

Contribution

This study introduces the effect of gluon condensate into holographic calculations of quarkonium properties, extending previous models that lacked this factor.

Findings

Gluon condensate reduces the imaginary potential and thermal width.

Higher gluon condensate levels lead to easier quarkonium dissociation.

Thermal width disappears at a critical condensate value.

Abstract

By the use of the gauge/gravity duality, we calculate the imaginary part of heavy quarkonium potential and thermal width with the effect of gluon condensate which is absent in AdS$_{5}$ background. Our results show that the dropping gluon condensate reduces the absolute value of imaginary potential and therefore decreases the thermal width both in "exact" and "approximate" approach implying that the heavy quarkonium has a weaker bound with the increase of gluon condensate. In addition, the thermal width will disappear at a critical condensate value, which indicates the dissociation of quarkonium. We conclude that increasing gluon condensate will lead to easier dissociation of heavy quarkonium for fixed temperature.