ar X iv : h ep - l at / 0 11 00 85 v 1 1 5 O ct 2 00 1 1 One - loop renormalization of heavy - light currents ∗

ar X iv : h ep - l at / 0 01 00 56 v 1 2 8 O ct 2 00 0 1 Perturbative renormalization of the ∆ B = 2 four - quark operators in lattice

We present a perturbative calculation of the renormalization constants for the ∆B = 2 four-quark operators, which is needed to evaluate the bag parameters BB and BS in lattice QCD. The one-loop coefficients are calculated for the O(1/M) NRQCD heavy quark action and the O(a)-improved Wilson action for light quark. Using these coefficients, which remove O(αs/aM) error, we reanalyze our previous c...

ar X iv : h ep - t h / 01 10 11 2 v 1 1 2 O ct 2 00 1 One loop renormalization of spontaneously broken U ( 2 ) gauge theory on noncommutative

We examine the renormalizability problem of spontaneously broken non-Abelian gauge theory on noncommutative spacetime. We show by an explicit analysis of the U(2) case that ultraviolet divergences can be removed at one loop level with the same limited number of renormalization constants as required on commutative spacetime. We thus push forward the efforts towards constructing realistic models ...

ar X iv : h ep - l at / 0 11 01 30 v 1 1 6 O ct 2 00 1 1 QCD spectroscopy with three light quarks

We report about a simulation using three dynamical Wilson quarks and on the progress in going to small quark masses.

ar X iv : h ep - l at / 0 11 00 06 v 1 2 O ct 2 00 1 1 Matrix elements of ∆ S = 2 operators with Wilson fermions

ar X iv : h ep - l at / 0 11 01 63 v 2 2 2 O ct 2 00 1 1 Spectral density calculations in a heavy - light meson - meson system ∗

A system of two static quarks, at fixed distances r, and two light quarks is studied on an anisotropic lattice. Excitations by operators emphasizing quark or gluon degrees of freedom are examined. The maximum entropy method is applied in the spectral analysis. These simulations ultimately aim at learning about mechanisms of hadronic interaction.