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

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.

19 pages, 18 Figures. Typos corrected, reference added, version to appear in Phys. Rev. D. arXiv admin note: text overlap with arXiv:0910.2419

References in corpus (6)

• Ab-initio Determination of Light Hadron Masses
• Scaling studies of QCD with the dynamical HISQ action
• Light hadron spectroscopy using domain wall valence quarks on an Asqtad sea
• Light baryon masses with dynamical twisted mass fermions
• Hyperons in Two Flavor Chiral Perturbation Theory
• Lattice QCD with a twisted mass term and a strange quark

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