Charmed bottom baryon spectroscopy from lattice QCD

TL;DR

This paper uses lattice QCD to compute the masses of various charmed and bottom baryons, providing theoretical predictions that align with known experimental data and extending knowledge to unobserved states.

Contribution

It presents a comprehensive lattice QCD calculation of 36 heavy baryon states with different heavy quark combinations, including continuum and physical pion mass extrapolations.

Findings

Results agree with experimental data for observed baryons.

Provides predictions for unobserved heavy baryons.

Includes analysis from multiple lattice spacings and pion masses.

Abstract

We calculate the masses of baryons containing one, two, or three heavy quarks using lattice QCD. We consider all possible combinations of charm and bottom quarks, and compute a total of 36 different states with $J^P = \frac12^+$ and $J^P = \frac32^+$. We use domain-wall fermions for the up, down, and strange quarks, a relativistic heavy-quark action for the charm quarks, and nonrelativistic QCD for the bottom quarks. Our analysis includes results from two different lattice spacings and seven different pion masses. We perform extrapolations of the baryon masses to the continuum limit and to the physical pion mass using $SU(4|2)$ heavy-hadron chiral perturbation theory including $1/m_Q$ and finite-volume effects. For the 14 singly heavy baryons that have already been observed, our results agree with the experimental values within the uncertainties. We compare our predictions for the hitherto unobserved states with other lattice calculations and quark-model studies.