Progress on four flavor QCD with the HISQ action

Details Progress on four flavor QCD with the HISQ action Progress on four flavor QCD with the HISQ action

2009-11-04

arxiv.org/abs/0911.0869v1

PoS LAT2009:123,2009

Physics

High Energy Physics

High Energy Physics - Lattice

8 pages, 7 figures, poster presented at The XXVII International Symposium on Lattice Field Theory - LAT2009, July 26-31 2009,

Scientific paper

We describe recent progress on generation of gauge configurations using the Highly Improved Staggered Quark (HISQ) action that was designed by the HPQCD/UKQCD collaboration. The HISQ action requires two levels of smearing with a reunitarization of the links before the second smearing. We describe how we deal with the occurrence of occasional large forces arising from the reunitarization step. The MILC collaboration is currently generating ensembles with approximate lattice spacings of 0.15, 0.12, 0.09, and 0.06 fm, with the strange and charm quark masses close to their physical values and the mass of the light quarks m_l set to 0.2 m_s. We present recent results for pion taste splittings, light hadron masses, the static potential, the eta_c dispersion relation and the topological susceptibility.

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