7 research outputs found
B semileptonic decays with 2+1 dynamical quark flavors
We study semileptonic B decays, using MILC dynamical configurations with
. NRQCD heavy and AsqTad light quark actions are used. We obtain the
semileptonic form factors and in the chiral limit.Comment: 6 pages, 3 figures, talk presented at Lattice 2005 (Heavy quark
physics
Progress Calculating Decay Constants with NRQCD and AsqTad Actions
We combine a light AsqTad antiquark with a nonrelativistic heavy quark to
compute the decay constants of heavy-light pseudoscalar mesons using the
ensemble of 3-flavor gauge field configurations generated by the MILC
collaboration. Preliminary results for and are given and
status of the chiral extrapolation to is reported. We also touch upon
results of the perturbative calculation which matches matrix elements in the
effective theory to the full theory at 1-loop order.Comment: Talk delivered at Lattice2003(heavy), 3 page
B Decays on the Lattice and Results for Phenomenology
Lattice Monte Carlo simulations now include the effects of 2 light sea quarks
and 1 strange sea quark through the use of an improved staggered fermion
action. Consequently, results important to phenomenology are free of the
approximate 10% errors inherent in the quenched approximation. This talk
reports on calculations of the B and Bs decay constants and B -> pi l nu form
factors. Accurate determinations of these quantities will lead to tighter
constraints on CKM matrix elements.Comment: Contributed to the Proceedings of American Physical Society's 2004
Meeting of the Division of Particles and Fields (DPF2004), Riverside, CA,
26-31 August 2004. 3 page
One-Loop Matching of the Heavy-Light A_0 and V_0 Currents with NRQCD Heavy and Improved Naive Light Quarks
One-loop matching of heavy-light currents is carried out for a highly
improved lattice action, including the effects of dimension 4 O(1/M) and O(a)
operators. We use the NRQCD action for heavy quarks, the Asqtad improved naive
action for light quarks, and the Symanzik improved glue action. As part of the
matching procedure we also present results for the NRQCD self energy and for
massless Asqtad quark wavefunction renormalization with improved glue.Comment: 25 pages, 3 eps-figure