ar X iv : h ep - l at / 0 20 91 22 v 1 1 3 Se p 20 02 1 The determination of α s from lattice QCD with 2 + 1 flavors of dynamical
نویسندگان
چکیده
We describe the first lattice determination of the strong coupling constant with 3 flavors of dynamical quarks. The method follows previous analyses in using a perturbative expansion for the plaquette and Upsilon spectroscopy to set the scale. Using dynamical configurations from the MILC collaboration with 2+1 flavors of dynamical quarks we are able to avoid previous problems of haivng to extrapolate to 3 light flavors from 0 and 2. Our result agrees with our previous work: α M S s (MZ) = 0.121(3).
منابع مشابه
ar X iv : h ep - l at / 0 20 91 41 v 1 1 9 Se p 20 02 Gasser – Leutwyler coefficients : A progress report
Last year, we reported our first results on the determination of Gasser–Leutwyler coefficients using partially quenched lattice QCD with three flavors of dynamical staggered quarks. We give an update on our progress in determining two of these coefficients, including an exhaustive effort to estimate all sources of systematic error. At this conference, we have heard about algorithmic techniques ...
متن کاملar X iv : h ep - l at / 0 20 91 18 v 1 1 3 Se p 20 02 1 Monopole Condensation in full QCD using the Schrödinger Functional
We use a lattice thermal partition functional to study Abelian monopole condensation in full QCD with N f = 2 staggered fermions. We present preliminary results on 16 3 × 4 and 32 3 × 4 lattices.
متن کاملar X iv : h ep - l at / 0 30 90 81 v 1 1 5 Se p 20 03 1 The mass of the charm quark from unquenched lattice QCD at fixed lattice spacing
We determine the mass of the charm quark (mc) from lattice QCD with two flavors of dynamical quarks with a mass around the strange quark. We compare this to a determination in quenched QCD which has the same lattice spacing (0.1 fm). We investigate different formulations of the quark mass, based on the Vector Ward Identity, PCAC relation and the FNAL heavy quark formalism. Based on these prelim...
متن کاملar X iv : h ep - l at / 9 80 91 02 v 2 1 6 Se p 19 98 1 Phase structure of lattice QCD at finite temperature for 2 + 1 flavors of
We report on a study of the finite-temperature chiral transition on an Nt = 4 lattice for 2 + 1 flavors of Kogut-Susskind quarks. We find the point of physical quark masses to lie in the region of crossover, in agreement with results of previous studies. Results of a detailed examination of the m u,d = ms case indicate vanishing of the screening mass of σ meson at the end point of the first-ord...
متن کاملar X iv : h ep - l at / 0 20 91 08 v 1 1 1 Se p 20 02 1 K → ππ Decay Amplitude on the Lattice
Recent theoretical and numerical progresses of the lattice calculations of K → ππ decay amplitude are reviewed.
متن کامل