FK/Fpi in full QCD
A. Ramos (for the Budapest-Marseille-Wuppertal collaboration)
TL;DR
This paper accurately determines the ratio of decay constants FK/Fpi in full QCD with 2+1 flavors using lattice calculations, achieving a precise result with controlled uncertainties.
Contribution
It provides a high-precision lattice QCD calculation of FK/Fpi with multiple couplings, large volumes, and low pion masses, ensuring systematic uncertainties are well-managed.
Findings
FK/Fpi ratio = 1.192 ± 0.007(stat) ± 0.006(sys)
Systematic uncertainties are under control
Results are based on simulations with pion mass down to 190 MeV
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 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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Taxonomy
TopicsQuantum Chromodynamics and Particle Interactions · Particle physics theoretical and experimental studies · High-Energy Particle Collisions Research