Light and Strange Quark Masses with Dynamical Wilson Fermions.pdfVIP

1 Light and Strange Quark Masses with Dynamical Wilson Fermions. 7 9 ∗ a Henning Hoeber (for the SESAM collaboration ) 9 1 aDepartment of Physics, University of Wuppertal, Gaussstr. 20, 42119 Wuppertal, Germany; p HLRZ c/o J¨ulich Research Centre and DESY, Hamburg, 52425 J¨ulich, Germany. e S We determine the masses of the light and the strange quarks in the MS-scheme using our high-statistics lattice 1 simulation of QCD with dynamical Wilson fermions. For each of our three sea quarks we have analyzed our data 1 at five different values of the valence quark mass, enabling us to parameterize our fit results in the (msea , mvalence) plane. For the light quark mass we find mlight (2 GeV) = 2.7(2) MeV, which is lower than in quenched simulations. 1 MS Applying a new method, which we propose to extract the strange quark mass in a sea of two dynamical light v strange quarks, we obtain m (2 GeV) = 140(20) MeV. 0 MS 1 3 9 1. Introduction lattice quark mass under consideration. Typi- 0 7 More than 25 years after the introduction of cally, the pseudoscalar meson mass, having the 9 smallest statistical lattice-error of all hadrons, is / quarks as the constituents of hadrons the absolute used. This step also invokes χPT, often only to h values of the light quark masses, as given in the lowest order, to relate the pseudoscalar mass to p- cur