Akira Ukawa

Quenched Light Hadron Spectrum

We present results of a large-scale simulation for the flavor nonsinglet light hadron spectrum in quenched lattice QCD with the Wilson quark action. Hadron masses are calculated at four values of lattice spacing in the range a approximately 0.1-0.05 fm on lattices with a physical extent of 3 fm at five quark masses corresponding to m(pi)/m(rho) approximately 0.75-0.4. The calculated spectrum in the continuum limit shows a systematic deviation from experiment, though the magnitude of deviation is contained within 11%. Results for decay constants and light quark masses are also reported.

Phase structure and critical temperature of two-flavor QCD with a renormalization group improved gauge action and clover improved Wilson quark action

We study the finite-temperature phase structure and the transition temperature of QCD with two flavors of dynamical quarks on a lattice with the temporal size

Equation of state for pure SU(3) gauge theory with renormalization group improved action

N_t=4

Finite-size scaling study of the deconfining phase transition in pure SU(3) lattice gauge theory

, using a renormalization group improved gauge action and the Wilson quark action improved by the clover term. The region of a parity-broken phase is identified, and the finite-temperature transition line is located on a two-dimensional parameter space of the coupling (

Kaon B-parameter from quenched domain-wall QCD

beta=6/g^2

Equation of state in finite-temperature QCD with two flavors of improved Wilson quarks

) and hopping parameter

I=2 pion scattering length from two-pion wave functions

K

Decay constants of B and D mesons from improved relativistic lattice QCD with two flavors of sea quarks

. Near the chiral transition point, defined as the crossing point of the critical line of the vanishing pion mass and the line of finite-temperature transition, the system exhibits behavior well described by the scaling exponents of the three-dimensional O(4) spin model. This indicates a second-order chiral transition in the continuum limit. The transition temperature in the chiral limit is estimated to be

Spectral function and excited states in lattice QCD with the maximum entropy method

T_c = 171(4)

Helium nuclei, deuteron and dineutron in 2+1 flavor lattice QCD

MeV.