A. Ali Khan

The nucleon mass in Nf=2 lattice QCD: Finite size effects from chiral perturbation theory

Abstract In the framework of relativistic SU(2) f baryon chiral perturbation theory we calculate the volume dependence of the nucleon mass up to and including O ( p 4 ). Since the parameters in the resulting finite size formulae are fixed from the pion mass dependence of the large volume nucleon masses and from phenomenology, we obtain a parameter-free prediction of the finite size effects. We present mass data from the recent N f =2 simulations of the UKQCD and QCDSF Collaborations and compare these data as well as published mass values from the dynamical simulations of the CP-PACS and JLQCD Collaborations with the theoretical expectations. Remarkable agreement between the lattice data and the predictions of chiral perturbation theory in a finite volume is found.

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

Kaon B-parameter from quenched domain-wall QCD

, 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 (

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

beta=6/g^2

Axial coupling constant of the nucleon for two flavours of dynamical quarks in finite and infinite volume

) and hopping parameter

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

K

Heavy-light mesons and baryons with b 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

Dynamical quark effects on light quark masses.

T_c = 171(4)

Accelerating the hybrid Monte Carlo algorithm

MeV.