We present preliminary results for the chiral behavior of charged pseudo-Goldstone-boson masses and decay constants. These are obtained in simulations with Nf =2+1 flavors of tree-level, O(a)improved Wilson sea quarks. In these simulations, mesons are composed of either valence quarks discretized in the same way as the sea quarks (unitary simulations) or of overlap valence quarks (mixed-action simulations). We find that the chiral behavior of the pseudoscalar meson masses in the mixed-action calculations cannot be explained with continuum, partially-quenched chiral perturbation theory. We show that the inclusion of O(a2) unitarity violations in the chiral expansion resolves this discrepancy and that the size of the unitarity violations required are consistent with those which we observe in the zero-momentum, scalar-isotriplet-meson propagator.
|Original language||English (US)|
|Journal||Proceedings of Science|
|State||Published - 2007|
|Event||25th International Symposium on Lattice Field Theory, LATTICE 2007 - Regensburg, Germany|
Duration: Jul 30 2007 → Aug 4 2007
All Science Journal Classification (ASJC) codes