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|Title:||SU(2) Low-Energy Constants from Mixed-Action Lattice QCD|
|Author:||Beane, Silas R.|
Junnarkar, P. M.
Luu, Thomas C.
Parreño García, Assumpta
Savage, Martin J.
|Keywords:||Física de partícules|
|Publisher:||American Physical Society|
|Abstract:||An analysis of the pion mass and pion decay constant is performed using mixed-action lattice QCD calculations with domain-wall valence quarks on ensembles of rooted, staggered n f = 2 + 1 configurations generated by the MILC Collaboration. Calculations were performed at two lattice spacings of b ≈ 0.125 fm and b ≈ 0.09 fm , at two strange quark masses, multiple light quark masses, and a number of lattice volumes. The ratios of light quark to strange quark masses are in the range 0.1 ≤ m l / m s ≤ 0.6 , while pion masses are in the range 235 ≲ m π ≲ 680 MeV . A two-flavor chiral perturbation theory analysis of the lattice QCD calculations constrains the Gasser-Leutwyler coefficients ¯ l 3 and ¯ l 4 to be ¯ l 3 = 4.04 ( 40 ) ( 73 55 ) and ¯ l 4 = 4.30 ( 51 ) ( 84 60 ) . All systematic effects in the calculations are explored, including those from the finite lattice space-time volume, the finite lattice spacing, and the finite fifth dimension in the domain-wall quark action. A consistency is demonstrated between a chiral perturbation theory analysis at fixed lattice spacing combined with a leading order continuum extrapolation, and the mixed-action chiral perturbation theory analysis which explicitly includes the leading order discretization effects. Chiral corrections to the pion decay constant are found to give f π / f = 1.062 ( 26 ) ( 42 40 ) where f is the decay constant in the chiral limit, and when combined with the experimental determination of f π results in a value of f = 122.8 ( 3.0 ) ( 4.6 4.8 ) MeV . The most recent scale setting by the MILC Collaboration yields a postdiction of f π = 128.2 ( 3.6 ) ( 4.4 6.0 ) ( 1.2 3.3 ) MeV at the physical pion mass. A detailed error analysis indicates that precise calculations at lighter pion masses is the single most important systematic to address to improve upon the present work.|
|Note:||Reproducció del document publicat a: https://doi.org/10.1103/PhysRevD.86.094509|
|It is part of:||Physical Review D, 2012, vol. 86, p. 094509|
|Appears in Collections:||Articles publicats en revistes (Física Quàntica i Astrofísica)|
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