Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2009-11-17
PoS LAT2009:244,2009
Physics
High Energy Physics
High Energy Physics - Lattice
7 pages, 5 figures, Talk presented at The XXVII International Symposium on Lattice Field Theory (LAT2009), July 26-31 2009, Pe
Scientific paper
We investigate an alternative to the Sequential Propagator Method used in Lattice QCD calculations of semileptonic form factors. We replace the sequential propagator with a stochastic propagator so that, in principle, all momentum and sink smearing combinations are available with only a single spin-color inversion. Practically, the stochastic noise is significant and must be reduced at the cost of more inversions. We study the behavior of the stochastic noise and compare the computational costs of this stochastic technique and the Sequential Propagator Method. We also present preliminary semileptonic form factor results using the stochastic technique on N_f=2 configurations with a non-perturbatively improved Sheikoleslami-Wohlert action generated by the QCDSF collaboration. At a fixed cost, measured in terms of the number of heavy-quark inversions, the method provides more correlators for the extraction of the form factors at various q^2's than the Sequential Propagator Method. These additional correlators reduce the total statistical errors of certain kinematic points, although the stochastic error is still comparable to the gauge error at other points.
Bali Gunnar
Collins Sara
Evans Richard
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