Charmed baryon spectroscopy on the physical point in 2+1 flavor lattice QCD

TL;DR

This study uses 2+1 flavor lattice QCD with relativistic heavy quark action to compute charmed baryon masses at physical quark masses, providing predictions consistent with experiments and new mass estimates for unobserved states.

Contribution

First to perform charmed baryon spectroscopy directly at the physical point using reweighted 2+1 flavor lattice QCD configurations.

Findings

Results agree with experimental data for most charmed baryons.

Predicted masses for unobserved doubly and triply charmed baryons.

Weak experimental evidence for $ ext{Xi}_{cc}$ mass.

Abstract

We investigate the charmed baryon mass spectrum using the relativistic heavy quark action on 2+1 flavor PACS-CS configurations previously generated on $32^3 \times 64$ lattice. The dynamical up-down and strange quark masses are set to the physical values by using the technique of reweighting to shift the quark hopping parameters from the values employed in the configuration generation. At the physical point, the lattice spacing equals $a^{-1}=2.194(10)$ GeV and the spatial extent $L=2.88(1)$ fm. Our results for the charmed baryon masses are consistent with experiments except for $\Xi_{cc}$, which has only weak experimental evidence yet. We also predict mass values for other doubly and triply charmed baryons.