We fit lattice-QCD data for light-pseudoscalar masses and decay constants, from HISQ configurations generated by MILC, to SU(3) staggered chiral perturbation theory. At present such fits have rather high values of chi^2/d.o.f., possibly due to the lack of ensembles with lighter-than-physical sea strange-quark masses. We propose solutions to this problem for future work. We also perform simple linear interpolations near the physical point on two ensembles with different lattice spacings, and obtain the preliminary result (f_K / f_pi)^phys = 1.1872(41) in the continuum limit.
@article{arxiv.1111.4314,
title = {Properties of light pseudoscalars from lattice QCD with HISQ ensembles},
author = {MILC Collaboration and A. Bazavov and C. Bernard and C. DeTar and W. Freeman and Steven Gottlieb and U. M. Heller and J. E. Hetrick and J. Kim and J. Laiho and L. Levkova and M. Lightman and M. Oktay and J. Osborn and R. L. Sugar and D. Toussaint and R. S. Van de Water},
journal= {arXiv preprint arXiv:1111.4314},
year = {2011}
}
Comments
6 pages, 2 figures, 2 tables, Talk presented at The XXIX International Symposium on Lattice Field Theory, July 10 - 16, 2011, Squaw Valley, Lake Tahoe, California, USA