An Algorithm for Obtaining Reliable Priors for Constrained-Curve Fits

Draper, Terrence; Dong, Shao-Jing; Horvath, Ivan; Lee, Frank; Mathur, Nilmani; Zhang, Jianbo

An Algorithm for Obtaining Reliable Priors for Constrained-Curve Fits

Authors

Description

We introduce the ``Sequential Empirical Bayes Method'', an adaptive constrained-curve fitting procedure for extracting reliable priors. These are then used in standard augmented-chi-square fits on separate data. This better stabilizes fits to lattice QCD overlap-fermion data at very low quark mass where a priori values are not otherwise known. We illustrate the efficacy of the method with data from overlap fermions, on a quenched $16^3\times 28$ lattice with spatial size La=3.2 fm and pion mass as low as $\sim$ 180 MeV.
Lattice2003(machine), 3 pages, 3 figures