摘要
We study the K meson in 2 ＋ 1 flavor QCD with sufficiently light u/d quarks. Using numerical simulations, we measure the point-to-point K correlators in the ＂Asqtad＂ improved staggered fermion formu- lation. We then analyze these correlators using rooted staggered chiral perturbation theory （rSxPT）, with particular attention paid to bubble contribution. After chiral extrapolation, we obtain the physical K mass with 828＋97 MeV, which is within the recent experimental value of 800-900 MeV. These numerical simulations are carried out with MILC 2 ＋ 1 flavor gauge configurations at a lattice spacing of α = 0.12 fm.
We study the K meson in 2 ＋ 1 flavor QCD with sufficiently light u/d quarks. Using numerical simulations, we measure the point-to-point K correlators in the ＂Asqtad＂ improved staggered fermion formu- lation. We then analyze these correlators using rooted staggered chiral perturbation theory （rSxPT）, with particular attention paid to bubble contribution. After chiral extrapolation, we obtain the physical K mass with 828＋97 MeV, which is within the recent experimental value of 800-900 MeV. These numerical simulations are carried out with MILC 2 ＋ 1 flavor gauge configurations at a lattice spacing of α = 0.12 fm.
基金
Supported by Fundamental Research Funds for Central Universities (2010SCU23002)
Startup Grant from the Institute of Nuclear Science and Technology of Sichuan University
