Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2009-05-07
Phys.Rev.D80:054502,2009
Physics
High Energy Physics
High Energy Physics - Lattice
26 pages, 10 tables, 58 figures
Scientific paper
10.1103/PhysRevD.80.054502
We investigate the quark mass dependence of baryon masses in 2+1 flavor lattice QCD using SU(3) heavy baryon chiral perturbation theory up to one-loop order. The baryon mass data used for the analyses are obtained for the degenerate up-down quark mass of 3 MeV to 24 MeV and two choices of the strange quark mass around the physical value. We find that the SU(3) chiral expansion fails to describe both the octet and the decuplet baryon data if phenomenological values are employed for the meson-baryon couplings. The SU(2) case is also examined for the nucleon. We observe that higher order terms are controlled only around the physical point. We also evaluate finite size effects using SU(3) heavy baryon chiralperturbation theory, finding small values of order 1% even at the physical point.
Ishikawa Kei-Ichi
Ishizuka Naruhito
Izubuchi Taku
Kadoh Daisuke
Kanaya Kazuyuki
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