25 research outputs found
Light hadron spectrum in three-flavor QCD with O(a)-improved Wilson quark action
We report on a calculation of the light hadron spectrum and quark masses in
three-flavor dynamical QCD using the non-perturbatively O(a)-improved Wilson
quark action and a renormalization-group improved gauge action. Simulations are
carried out on a 16^3 \times 32 lattice at \beta=1.9, where a^{-1} \simeq 2GeV,
with 6 ud quark masses corresponding to m_{pi}/m_{rho} \simeq 0.64-0.77 and 2 s
quark masses close to the physical value. We observe that the inclusion of
dynamical strange quark brings the lattice QCD meson spectrum to good agreement
with experiment. Dynamical strange quarks also lead to a reduction of the uds
quark masses by about 15%.Comment: 3 pages, 4 figures, Lattice2003(spectrum), Fig.1 correcte
Light hadron spectrum with two flavors of improved dynamical quarks : final results from JLQCD
We present the final results of the JLQCD calculation of the light hadron
spectrum and quark masses with two flavors of dynamical quarks using the
plaquette gauge action and fully -improved Wilson quark action at
. We observe that sea quark effects lead to a closer agreement of
the strange meson and baryon masses with experiment and a reduction of quark
masses by about 25.Comment: 3 pages, 5 figures, Lattice2002 (spectrum
An exact algorithm for three-flavor QCD with -improved Wilson fermions
We present an exact dynamical QCD simulation algorithm for the
-improved Wilson fermion with odd number of flavors. Our algorithm is an
extension of the non-Hermitian polynomials HMC algorithm proposed by Takaishi
and de Forcrand previously. In our algorithm, the systematic errors caused by
the polynomial approximation of the inverse of Dirac operator is removed by a
noisy-Metropolis test. For one flavor quark it is achieved by taking the square
root of the correction matrix explicitly. We test our algorithm for the case of
on a moderately large lattice size (). The
case is also investigated.Comment: Lattice 2001 (algorithm), 3 pages, LaTeX2e with espcrc2.st