218 research outputs found
P-wave meson properties with Wilson quarks
We describe two calculations involving P-wave mesons made of Wilson quarks:
the strong coupling constant in the presence of two flavors of light
dynamical fermions and the mass and decay constant of the meson.Comment: Poster presented at Lattice '94, September 27--October 1, 1994,
Bielefeld, Germany (no changes to manuscript, but correction of Authors list
above
First determination of the strange and light quark masses from full lattice QCD
We compute the strange quark mass and the average of the and
quark masses using full lattice QCD with three dynamical quarks
combined with experimental values for the pion and kaon masses. The simulations
have degenerate and quarks with masses as low as
, and two different values of the lattice spacing. The bare lattice
quark masses obtained are converted to the \msbar scheme using perturbation
theory at . Our results are: m_s^\msbar(2 GeV) = 76(0)(3)(7)(0)
MeV, \hat m^\msbar(2 GeV) = 2.8(0)(1)(3)(0) MeV and =
27.4(1)(4)(0)(1), where the errors are from statistics, simulation,
perturbation theory, and electromagnetic effects, respectively.Comment: 5 pages, revtex, 2 figures. v2: New ms/hat(m) discussion and
reference, v3: slight change in discussion of referenc
High-Precision Lattice QCD Confronts Experiment
We argue that high-precision lattice QCD is now possible, for the first time,
because of a new improved staggered quark discretization. We compare a wide
variety of nonperturbative calculations in QCD with experiment, and find
agreement to within statistical and systematic errors of 3% or less. We also
present a new determination of alpha_msbar(Mz); we obtain 0.121(3). We discuss
the implications of this breakthrough for phenomenology and, in particular, for
heavy-quark physics.Comment: 2 figures, revte
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