Chiral limit of light hadron mass in quenched staggered QCD

We have been reporting our quenched staggered light hadron mass calculations for the past few years [1]. Our inverse squared coupling is set at β=6.5 corresponding to a high cutoff of a∼3.7 GeV. The lattice volume of 48 × 64 covers about 2.6 fm across for each space dimension and hence is comfortable enough even for our lightest pion with mπ∼0.06 a =220 MeV. We calculated staggered quark propagators using “corner” and “even” wall sources of a few different wall sizes and point sink, with quark mass values set at mqa=0.01, 0.005, 0.0025, and 0.00125 for each of the 250 well-separated gauge configurations and then formed various light-hadron propagators. We did not see any significant autocorrelation among the hadron propagators, and our Jack-knife and [other] error analysis were all consistent with each other. So we could solidly draw various quantitative conclusions, of which most important are