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Strange and charm baryon masses with two flavors of dynamical twisted mass fermions
Alexandrou C., Carbonell J., Christaras D., Drach V., Gravina M. et al
Physical Review D 86 (2012) 114501 - http://hal.in2p3.fr/in2p3-00713550
Physique/Physique des Hautes Energies - Réseau
Physique/Physique des Hautes Energies - Phénoménologie
Physique/Physique Nucléaire Théorique
Strange and charm baryon masses with two flavors of dynamical twisted mass fermions
C. Alexandrou, J. Carbonell, D. Christaras, V. Drach, M. Gravina, M. Papinutto1
1 :  LPSC - Laboratoire de Physique Subatomique et de Cosmologie
CNRS : UMR5821 – IN2P3 – Université Joseph Fourier - Grenoble I – Institut Polytechnique de Grenoble - Grenoble Institute of Technology
53 avenue des Martyrs - 38026 Grenoble Cedex
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.

Articles dans des revues avec comité de lecture
Physical Review D (Phys. Rev. D)
Publisher American Physical Society
ISSN 1550-7998 (eISSN : 1550-2368)

19 pages, 18 Figures
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