TY - JOUR
T1 - Chiral behavior of pseudo-Goldstone boson masses and decay constants in 2 + 1 flavor QCD
AU - Dürr, S.
AU - Fodor, Z.
AU - Hoelbling, C.
AU - Katz, S. D.
AU - Krieg, S.
AU - Kurth, Th
AU - Lellouch, L.
AU - Lippert, Th
AU - Szabo, K. K.
AU - Vulvert, G.
N1 - Funding Information:
Computations are performed on the BlueGene/L at FZ Jülich and on clusters at the University of Wuppertal and at CPT Marseille. This work is supported in part by EU grant I3HP, OTKA grant AT049652, DFG grant FO 502/1, EU RTN contract MRTN-CT-2006-035482 (FLAVIAnet) and by the CNRS’s GDR grant no2921 (“Physique subatomique et calculs sur réseau”).
Publisher Copyright:
© Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike Licence.
PY - 2007
Y1 - 2007
N2 - 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.
AB - 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.
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M3 - Conference article
AN - SCOPUS:85055428410
SN - 1824-8039
VL - 42
JO - Proceedings of Science
JF - Proceedings of Science
M1 - 115
T2 - 25th International Symposium on Lattice Field Theory, LATTICE 2007
Y2 - 30 July 2007 through 4 August 2007
ER -