Dynamical quark effects on light quark masses.

CP-PACS Collaboration

Ali Khan A

Aoki S

Boyd G

Burkhalter R

Ejiri S

Fukugita M

Hashimoto S

Ishizuka N

Iwasaki Y

Kanaya K

Kaneko T

Kuramashi Y

Manke T

Nagai K

Okawa Masanori

Shanahan H. P.

Ukawa A

Yoshié T

Physical Review Letters

Light quark masses are calculated in lattice QCD with two degenerate flavors of dynamical quarks. The calculations are made with improved actions with lattice spacing a = 0.22–0.11 fm. In the continuum limit we find mudMS̅(2 GeV) = 3.44-0.22+0.14 MeV using the π and ρ meson masses as physical input, and msMS̅(2 GeV) = 88-6+4 MeV or 90-11+5 MeV with the K or φ meson mass as additional input. The quoted errors represent statistical and systematic combined, the latter including those from continuum and chiral extrapolations, and from renormalization factors. Compared to quenched results, two flavors of dynamical quarks reduce quark masses by about 25%.

420

eng

The American Physical Society

Copyright (c) 2000 The American Physical Society

[ISSN] 0031-9007

[DOI] http://dx.doi.org/10.1103/PhysRevLett.85.4674 isVersionOf