Results for light pseudoscalars from three-flavor simulations

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dc.creatorMILC Collaboration
dc.creatorAubin, C.
dc.creatorBernard, C.
dc.creatorDeTar, C.
dc.creatorGottlieb, Steven
dc.creatorGregory, E. B.
dc.creatorHeller, Urs M.
dc.creatorHetrick, J. E.
dc.creatorOsborn, J.
dc.creatorSugar, R. L.
dc.creatorToussaint, D.
dc.date2004-09-10
dc.date.accessioned2026-07-07T11:30:49Z
dc.date.available2026-07-07T11:30:49Z
dc.descriptionWe compute pseudoscalar meson masses and decay constants in partially quenched QCD with three dynamical flavors of improved staggered quarks. Fitting the lattice data to staggered chiral perturbation theory forms and extrapolating in quark mass and lattice spacing, we find: $f_π= 129.5 \pm 0.9 \pm 3.5$ MeV, $f_K = 156.6 \pm 1.0 \pm 3.6$ MeV, and $f_K/f_π= 1.210(4)(13)$. The value for $f_K/f_π$ implies $|V_{us}|=0.2219(26)$. We also obtain $m_u/m_d = 0.43(0)(1)(8)$, or, with more input on electromagnetic effects from the continuum, $m_u/m_d = 0.41(0)(1)(4)$. Using the one-loop perturbative mass renormalization, we determine $m_u$ and $m_d$ in the MSbar scheme.
dc.descriptionTalk presented at Lattice2004(spectrum), Fermilab, June 21 - 26, 2004; 3 pages, 2 figures
dc.identifierhttps://arxiv.org/abs/hep-lat/0409041
dc.identifierhttp://arxiv.org/abs/hep-lat/0409041
dc.identifierNucl.Phys.Proc.Suppl.140:231-233,2005
dc.identifierdoi:10.1016/j.nuclphysbps.2004.11.174
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/197091
dc.subjectHigh Energy Physics - Lattice
dc.subjectHigh Energy Physics - Phenomenology
dc.titleResults for light pseudoscalars from three-flavor simulations
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