S wave bottomonium states moving in a quark-gluon plasma from lattice NRQCD

TL;DR

This study investigates how S wave bottomonium states, like Upsilon and eta_b, behave at nonzero momentum within a quark-gluon plasma using lattice QCD with NRQCD, providing insights into their spectral functions and effective field theory comparisons.

Contribution

It extends previous lattice QCD analyses of bottomonium to include nonzero momentum states, focusing on low velocities and comparing results with effective field theory predictions.

Findings

Spectral functions for moving bottomonium states are obtained.

Results show consistency with effective field theory at low velocities.

Provides detailed analysis of S wave states in a hot medium.

Abstract

We extend our study of bottomonium spectral functions in the quark-gluon plasma to nonzero momentum. We use lattice QCD simulations with two flavours of light quark on highly anisotropic lattices and treat the bottom quark with nonrelativistic QCD (NRQCD). We focus on S wave (Upsilon and eta_b) channels and consider nonrelativistic velocities, v/c < 0.2. A comparison with predictions from effective field theory is made.