Zusammenfassung
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^2\$ 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. Lessons learned (including
caveats limiting the scope of the method) from studying artificial data are
presented. As an illustration, from local-local two-point correlation
functions, we obtain masses and spectral weights for ground and first-excited
states of the pion, give preliminary fits for the \$a\_0\$ where ghost states (a
quenched artifact) must be dealt with, and elaborate on the details of fits of
the Roper resonance and \$S\_11(N^1/2-)\$ previously presented elsewhere. The
data are from overlap fermions on a quenched \$16^328\$ lattice with
spatial size \$La=3.2 fm\$ and pion mass as low as \$180 MeV\$.
Nutzer