# Momentum anisotropy effects for quarkonium in a weakly-coupled quark-gluon plasma below the melting temperature

## TL;DR

This paper investigates how a small momentum anisotropy in a weakly-coupled quark-gluon plasma affects quarkonium properties, providing insights relevant for LHC experiments by calculating thermal corrections to binding energy and width.

## Contribution

It introduces a study of quarkonium spectrum modifications due to plasma anisotropy within the pNRQCD framework at finite temperature, focusing on a temperature range pertinent to current experiments.

## Key findings

- Computed leading thermal corrections to quarkonium binding energy.
- Analyzed thermal width induced by gluodissociation in anisotropic plasma.
- Explored temperature and Debye mass regimes relevant for LHC.

## Abstract

In the early stages of heavy-ion collisions, the hot QCD matter expands more longitudinally than transversely. This imbalance causes the system to become rapidly colder in the longitudinal direction and a local momentum anisotropy appears. In this paper, we study the heavy-quarkonium spectrum in the presence of a small plasma anisotropy. We work in the framework of pNRQCD at finite temperature. We inspect arrangements of non-relativistic and thermal scales complementary to those considered in the literature. In particular, we consider temperatures larger and Debye masses smaller than the binding energy, which is a temperature range relevant for presently running LHC experiments. In this setting we compute the leading thermal corrections to the binding energy and the thermal width induced by quarkonium gluo-dissociation.