2008年11月
Convergence of the Chiral Expansion in Two-Flavor Lattice QCD
PHYSICAL REVIEW LETTERS
- 巻
- 101
- 号
- 20
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1103/PhysRevLett.101.202004
- 出版者・発行元
- AMER PHYSICAL SOC
We test the convergence property of the chiral perturbation theory using a lattice QCD calculation of pion mass and decay constant with two dynamical quark flavors. The lattice calculation is performed using the overlap fermion formulation, which realizes exact chiral symmetry at finite lattice spacing. By comparing various expansion prescriptions, we find that the chiral expansion is well saturated at the next-to-leading order for pions lighter than similar to 450 MeV. Better convergence behavior is found, in particular, for a resummed expansion parameter xi, with which the lattice data in the pion mass region 290-750 MeV can be fitted well with the next-to-next-to-leading order formulas. We obtain the results in two-flavor QCD for the low energy constants (l) over bar (3) and (l) over bar (4) as well as the pion decay constant, the chiral condensate, and the average up and down quark mass.
- リンク情報
- ID情報
-
- DOI : 10.1103/PhysRevLett.101.202004
- ISSN : 0031-9007
- Web of Science ID : WOS:000260936100016