High Precision determination of the pi, K, D and D_s decay constants from lattice QCD

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dc.creatorFollana, E.
dc.creatorDavies, C. T. H.
dc.creatorLepage, G. P.
dc.creatorShigemitsu, J.
dc.date2007-06-12
dc.date2008-03-28
dc.date.accessioned2026-07-07T11:16:48Z
dc.date.available2026-07-07T11:16:48Z
dc.descriptionWe determine $D$ and $D_s$ decay constants from lattice QCD with 2% errors, 4 times better than experiment and previous theory: $f_{D_s}$ = 241(3) MeV, $f_D$ = 207(4) MeV and $f_{D_s}/f_D$ = 1.164(11). We also obtain $f_K/f_π$ = 1.189(7) and $(f_{D_s}/f_D)/(f_K/f_π)$ = 0.979(11). Combining with experiment gives $V_{us}$=0.2262(14) and $V_{cs}/V_{cd}$ of 4.43(41). We use a highly improved quark discretization on MILC gluon fields that include realistic sea quarks fixing the $u/d, s$ and $c$ masses from the $π$, $K$, and $η_c$ meson masses. This allows a stringent test against experiment for $D$ and $D_s$ masses for the first time (to within 7 MeV).
dc.description4 pages, 2 figures. Published version - changes from original include a more extensive discussion of errors and an error budget table covering more quantities. There are very small changes in some of the values reported
dc.identifierhttps://arxiv.org/abs/0706.1726
dc.identifierhttp://arxiv.org/abs/0706.1726
dc.identifierPhys.Rev.Lett.100:062002,2008
dc.identifierdoi:10.1103/PhysRevLett.100.062002
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/192798
dc.subjectHigh Energy Physics - Lattice
dc.subjectHigh Energy Physics - Phenomenology
dc.titleHigh Precision determination of the pi, K, D and D_s decay constants from lattice QCD
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