The ratio FK/Fpi in QCD

Abstract

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 lattice spacings, large volumes and a simulated pion mass reaching down to about 190 MeV. We obtain FK/Fpi=1.192 +/- 0.007(stat) +/- 0.006(syst). This result is then used to give an updated value of the CKM matrix element |Vus|. The unitarity relation for the first row of this matrix is found to be well observed.

15 pages, 4 figures, 2 tables

References in corpus (8)

• Ab-initio Determination of Light Hadron Masses
• Superallowed 0+ to 0+ nuclear beta decays: A new survey with precision tests of the conserved vector current hypothesis and the standard model
• Flavour physics of leptons and dipole moments
• High Precision determination of the pi, K, D and D_s decay constants from lattice QCD
• Collider aspects of flavour physics at high Q
• Scaling study of dynamical smeared-link clover fermions
• f_K/f_pi in Full QCD with Domain Wall Valence Quarks
• Progress in kaon physics on the lattice

Cited by in corpus (16)

• High-precision scale setting in lattice QCD
• Charmed and light pseudoscalar meson decay constants from four-flavor lattice QCD with physical light quarks
• Leptonic decay constants fK, fD and fDs with Nf = 2+1+1 twisted-mass lattice QCD
• Twenty-first Century Lattice Gauge Theory: Results from the QCD Lagrangian
• A note on isospin violation in Pl2(gamma) decays
• Flavour breaking effects in the pseudoscalar meson decay constants
• Decay constants of the pion and its excitations on the lattice
• Chiral extrapolation and determination of low-energy constants from lattice data
• Pseudoscalar decay constants from N_f=2+1+1 twisted mass lattice QCD
• Rho decay width from the lattice
• Charmed and light pseudoscalar meson decay constants from HISQ simulations
• Chiral extrapolation of SU(3) amplitudes
• Quark Flavor Physics Review
• The $K\pi$ form factors from Analyticity and Unitarity
• Analytic Approximations for the Extrapolation of Lattice Data
• The $D\pi$ form factors from analyticity and unitarity