Heavy hadron spectrum from 2+1+1 flavor MILC lattices

TL;DR

This study calculates the mass spectra and differences of heavy hadrons with bottom quarks using advanced lattice QCD techniques on MILC ensembles, providing detailed insights into heavy hadron properties.

Contribution

It introduces a comprehensive lattice QCD analysis of heavy hadron spectra with multiple quark flavors using specific actions for different quark types, advancing the understanding of heavy hadron mass structures.

Findings

Mass spectra of heavy hadrons with bottom quarks determined.

Mass differences between various heavy hadrons quantified.

Results consistent with experimental data where available.

Abstract

We study the mass spectra and various mass differences of heavy hadrons containing one or more bottom quarks using MILC's $N_f = 2+1+1$ HISQ gauge ensembles at three lattice spacings. For the valence quarks, we employ a combination of lattice actions: the NRQCD action is used for bottom quarks, the anisotropic Clover action for charm quarks, and the $O(a)$-improved Wilson--Clover action for strange and lighter (up/down) quarks. Heavy hadron operators with at least one bottom quark are constructed by considering all possible combinations with charm, strange, and light quarks corresponding to various quantum numbers.