Heavy hadrons on $N_f=2$ and $2+1$ improved clover-Wilson lattices

TL;DR

This paper calculates the masses of various heavy hadrons using improved lattice QCD techniques, providing new insights into their spectra and systematic effects in lattice simulations.

Contribution

It presents novel lattice QCD calculations of heavy hadron masses with improved actions and discusses systematic effects and spectrum details.

Findings

Masses of singly, doubly, and triply heavy hadrons are computed.

Spin splittings and parity states are analyzed.

Systematic effects due to finite volume are discussed.

Abstract

We present the masses of singly ($B$, $B_s$, $\Lambda_b$, $\Sigma_b$, etc.), doubly ($B_c$, $\eta_b$, $\Upsilon$, $\Xi_{bc}$, $\Xi_{bb}$, etc.), and triply ($\Omega_{bcc}$, $\Omega_{bbc}$, $\Omega_{bbb}$, etc.) heavy hadrons arising from (QCDSF-UKQCD) lattices with improved clover-Wilson light quarks. For the bottom quark, we use an $O(a,v^4)$-improved version of lattice NRQCD. Part of the bottomonia spectrum is used to provide an alternative scale and to determine the physical quark mass and radiative corrections used in the heavy-quark action. Results for spin splittings, opposite parities, and, in some cases, excited states are presented. Higher lying states and baryons with two light quarks appear to be especially affected by the relatively small volumes of this (initially) initial study. This and other systematics are briefly discussed.