ar X iv : h ep - l at / 0 11 01 05 v 1 1 5 O ct 2 00 1 1 Where do perturbative and non - perturbative QCD meet ?
نویسندگان
چکیده
We computed the static potential and Wilson loops to O(α 2) in perturbation theory for different lattice quark and gluon actions. In general, we find short distance lattice data to be well described by " boosted perturbation theory ". For Wilson-type fermions at present-day quark masses and lattice spacings agreement within 10 % between measured " β-shifts " and those predicted by perturbation theory is found. We comment on prospects for a determination of the real world QCD running coupling.
منابع مشابه
ar X iv : h ep - l at / 0 11 01 44 v 1 1 6 O ct 2 00 1 1 Re A 0 and Re A 2 from Quenched Lattice QCD
We have used domain wall fermions to calculate K → π and K → 0 matrix elements which can be used to study the ∆I = 1/2 rule for K decays in the Standard Model. Nonlinearities in the ∆I = 3/2 matrix elements due to chiral logarithms are explored and the subtractions needed for the ∆I = 1/2 matrix elements are discussed. Using renormalization factors calculated using non-perturbative renormalizat...
متن کاملar 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...
متن کاملar X iv : h ep - p h / 01 10 29 5 v 1 2 3 O ct 2 00 1 Theory of Multiparticle Production in the Soft Region
We review theoretical and experimental advances in the application of the perturbative QCD approach to the description of particle distributions in jets in the (semi) soft region with particular emphasis on HERA physics.
متن کاملar 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.
متن کاملar X iv : h ep - p h / 01 05 24 0 v 1 2 3 M ay 2 00 1 Quarkonium Spectroscopy and Perturbative QCD : A New Perspective ∗
We report new aspects of the recent theoretical progress in heavy quarkonium physics. (1) Contrary to wide beliefs, the gross structure of the bottomonium spectrum is described well by the non-relativistic boundstate theory based on perturbative QCD. (2) This leads to a new physical picture of the bottomonium states: the boundstate mass is composed mainly of the self-energies of b and ¯ b accum...
متن کامل