Strange and charm baryon masses with two flavors of dynamical twisted mass fermions

TL;DR

This study computes the masses of strange and charm baryons using twisted mass fermions with multiple lattice spacings and pion masses, extrapolating to physical values with chiral perturbation theory.

Contribution

First lattice QCD calculation of strange and charm baryon masses using twisted mass fermions with multiple lattice spacings and pion masses.

Findings

Masses of strange and charm baryons are obtained at different lattice spacings.

Results are extrapolated to physical pion mass using chiral perturbation theory.

Dependence of baryon masses on lattice spacing and quark masses is analyzed.

Abstract

The masses of the low-lying strange and charm baryons are evaluated using two degenerate flavors of twisted mass sea quarks for pion masses in the range of about 260 MeV to 450 MeV. The strange and charm valence quark masses are tuned to reproduce the mass of the kaon and D-meson at the physical point. The tree-level Symanzik improved gauge action is employed. We use three values of the lattice spacing, corresponding to $\beta=3.9$, $\beta=4.05$ and $\beta=4.2$ with $r_0/a=5.22(2)$, $r_0/a=6.61(3)$ and $r_0/a=8.31(5)$ respectively. %spacings $a=0.0855(5)$ and $a=0.0667(3)$ determined from the pion decay constant. We examine the dependence of the strange and charm baryons on the lattice spacing and strange and charm quark masses. The pion mass dependence is studied and physical results are obtained using heavy baryon chiral perturbation theory to extrapolate to the physical point.