Progress on four flavor QCD with the HISQ action

A. Bazavov, C. Bernard, C. DeTar, W. Freeman, Steven Gottlie, U. M. Heller, J. E. Hetrick, J. Laiho, L. Levkova, J. Osborn, R. Sugar, D. Toussaint, R. S. Van De Wateri

Research output: Contribution to journalConference Articlepeer-review

4 Scopus citations


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 ml set to 0.2ms. We present recent results for pion taste splittings, light hadron masses, the static potential, the c dispersion relation and the topological susceptibility.

Original languageEnglish (US)
JournalProceedings of Science
StatePublished - 2009
Externally publishedYes
Event27th International Symposium on Lattice Field Theory, LAT 2009 - Beijing, China
Duration: Jul 26 2009Jul 31 2009

ASJC Scopus subject areas

  • General


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