8,315 research outputs found
Lattice study on two-color QCD with six flavors of dynamical quarks
We study the dynamics of SU(2) gauge theory with NF=6 Dirac fermions by means
of lattice simulation to investigate if they are appropriate to realization of
electroweak symmetry breaking. The discrete analogue of beta function for the
running coupling constant defined under the Schroedinger functional boundary
condition are computed on the lattices up to linear size of L/a=24 and preclude
the existence of infrared fixed point below 7.6. Gluonic observables such as
heavy quark potential, string tension, Polyakov loop suggest that the target
system is in the confining phase even in the massless quark limit.Comment: 7 pages, 9 figures, Proceedings of The 30th International Symposium
on Lattice Field Theory, June 24-29, 2012, Cairns, Australi
One-loop renormalization of heavy-light currents
We calculate the mass dependent renormalization factors of heavy-light
bilinears at one-loop order of perturbation theory, when the heavy quark is
treated with the Fermilab formalism.
We present numerical results for the Wilson and Sheikholeslami-Wohlert
actions, with and without tree-level rotation.
We find that in both cases our results smoothly interpolate from the static
limit to the massless limit.
We also calculate the mass dependent Brodsky-Lepage-Mackenzie scale ,
with and without tadpole-improvement.Comment: Lattice2001(improvement), 3 pages, 4 figure
A lattice NRQCD computation of the bag parameters for = 2 operators
We present an update of our NRQCD calculation of at =5.9 with
increased statistics. We also discuss a calculation of , which is relevant
to the width difference in the mixing.Comment: LATTICE99 (Heavy Quarks), 3 pages, 2 figures, espcrc2.st
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