With sufficiently light u and d quarks the isovector （a0） and isosinglet （f0） scalar meson propagators are dominated at large distances by two-meson states. In the staggered fermion formulation of lattice QCD, tas...With sufficiently light u and d quarks the isovector （a0） and isosinglet （f0） scalar meson propagators are dominated at large distances by two-meson states. In the staggered fermion formulation of lattice QCD, taste-symmetry breaking causes a proliferation of multihadron states that complicates the analysis of these channels. Of special interest is the bubble contribution, which makes a considerable contribution to these channels. Using numerical simulation we have measured the correlators for both a0 and f0 channels in the ＂Asqtad＂ improved staggered fermion formulation in a MILC fine （a = 0.09 fm） lattice ensemble. We analyze those correlators using rooted staggered chiral perturbation theory （rSxPT） and achieve chiral couplings that are well consistent with previous determinations.展开更多
We studied the K light scalar meson in 2＋1 flavor full QCD with sufficiently light u and d quarks. Via lattice simulation we measured the correlators for the K channel in the ＂Asqtad＂ improved staggered fermion for...We studied the K light scalar meson in 2＋1 flavor full QCD with sufficiently light u and d quarks. Via lattice simulation we measured the correlators for the K channel in the ＂Asqtad＂ improved staggered fermion formulation. After chiral extrapolation we obtained the mass of the K meson with 826± 119 MeV, which is within recent experimental values of 800-900 MeV. The simulations were carried out with the MILC 2＋1 flavor gauge configurations at lattice spacing a ≈ 0.15 fm.展开更多
文摘With sufficiently light u and d quarks the isovector （a0） and isosinglet （f0） scalar meson propagators are dominated at large distances by two-meson states. In the staggered fermion formulation of lattice QCD, taste-symmetry breaking causes a proliferation of multihadron states that complicates the analysis of these channels. Of special interest is the bubble contribution, which makes a considerable contribution to these channels. Using numerical simulation we have measured the correlators for both a0 and f0 channels in the ＂Asqtad＂ improved staggered fermion formulation in a MILC fine （a = 0.09 fm） lattice ensemble. We analyze those correlators using rooted staggered chiral perturbation theory （rSxPT） and achieve chiral couplings that are well consistent with previous determinations.
基金Supported by Fundamental Research Funds for the Central Universities(2010SCU23002)
文摘We studied the K light scalar meson in 2＋1 flavor full QCD with sufficiently light u and d quarks. Via lattice simulation we measured the correlators for the K channel in the ＂Asqtad＂ improved staggered fermion formulation. After chiral extrapolation we obtained the mass of the K meson with 826± 119 MeV, which is within recent experimental values of 800-900 MeV. The simulations were carried out with the MILC 2＋1 flavor gauge configurations at lattice spacing a ≈ 0.15 fm.
