2011/11/30 by Taegil Bae, T. Bae, Yong-Chull Jang +12
Physics and Astronomy · #Chiral perturbation theory #Fermion #High-Energy Particle Collisions Research #Lattice (music) #Lattice QCD #Mathematical physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #Quantum mechanics #Valence (chemistry) #hep-lat #hep-ph
paper · pdf · doi:10.1103/physrevlett.109.041601
4 pages, 4 figures, 2 tables, updated references, updated grant numbers
arxiv created 2012/07/10 · openalex publication_date 2012/07/24 · arxiv updated 2013/05/29 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We present a calculation of the kaon B parameter BK using lattice QCD. We use improved staggered valence and sea fermions, the latter generated by the MILC Collaboration with Nf=2+1 light flavors. To control discretization errors, we use four different lattice spacings ranging down to a\ensuremath≈0.045 fm. The chiral and continuum extrapolations are done using SU(2) staggered chiral perturbation theory. Our final result is \stackrel^BK=0.727\ifmmode±\else\textpm\fi0.004(stat)\ifmmode±\else\textpm\fi0.038(syst), where the dominant systematic error is from our use of truncated (one-loop) matching factors.