NRQCD results on the MILC extra coarse ensemble

TL;DR

This paper uses NRQCD on MILC extra coarse lattices to study bottomonium, charmonium, B_c, B_d, and B_s systems, providing preliminary spectra and mass calculations across different heavy and light quark combinations.

Contribution

It presents novel NRQCD calculations on coarser lattices, extending previous work to include charm and light quark systems with improved staggered formalism.

Findings

Calculated bottomonium spectra on extra coarse lattices.

Determined charmonium spectrum and B_c mass using NRQCD.

Examined B_d and B_s systems with improved staggered quarks.

Abstract

We present preliminary results using NRQCD to describe heavy quarks on the MILC 2+1 flavour dynamical extra coarse ensemble. We calculate the spectra of low lying states in bottomonium to complement earlier results on the finer MILC ensembles. We then exploit the coarseness of the lattices to calculate charm propagators using NRQCD. These are used to examine the charmonium spectrum and to calclate the mass of the $B_c$ using NRQCD. Finally we look breifly at the $B_d$ and $B_s$ systems using the imporoved staggered formalism to describe the light valence quarks.