FK/Fpi in full QCD

Details FK/Fpi in full QCD FK/Fpi in full QCD

2010-02-08

arxiv.org/abs/1002.1665v1

PoS(LAT2009)259

Physics

High Energy Physics

High Energy Physics - Lattice

8 pages, 9 figures, 1 table. Presented at the XXVII International Symposium on Lattice Field Theory (2009)

Scientific paper

We determine the ratio FK/Fpi in QCD with Nf=2+1 flavors of sea quarks, based
on a series of lattice calculations with three different couplings, large
volumes and a simulated pion mass reaching down to about 190 MeV. We obtain
FK/Fpi = 1.192 +- 0.007(stat) +- 0.006(sys) with all the sources of systematic
uncertainty under control.

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