2023 journal article
Octet and decuplet baryon sigma terms and mass decompositions
PHYSICAL REVIEW D, 107(9).
open access via arxiv.org (repository)
We present a comprehensive analysis of the SU(3) octet and decuplet baryon masses and $\ensuremath{\sigma}$ terms using high-precision lattice QCD data and chiral SU(3) effective theory with finite range regularization. The effects of various systematic uncertainties, including from the scale setting of the lattice data and the regularization prescriptions, are quantified. We find the pion-nucleon and strange nucleon $\ensuremath{\sigma}$ terms to be ${\ensuremath{\sigma}}_{\ensuremath{\pi}N}=44(3)(3)\text{ }\text{ }\mathrm{MeV}$ and ${\ensuremath{\sigma}}_{Ns}=50(6)(1)\text{ }\text{ }\mathrm{MeV}$, respectively. The results provide constraints on the energy-momentum tensor mass decompositions of the SU(3) octet and decuplet baryons, where we find that the trace anomaly and quark-gluon energies decrease for strange baryons due to their larger strange $\ensuremath{\sigma}$ terms.