The extrapolation of nucleon axial charge gA is investigated within the framework of heavy baryon chiral effective field theory. The intermediate octet and decuplet baryons are included in the one loop calculation. Fi...The extrapolation of nucleon axial charge gA is investigated within the framework of heavy baryon chiral effective field theory. The intermediate octet and decuplet baryons are included in the one loop calculation. Finite range regularization is applied to improve the convergence in the quark-mass expansion. The lattice data from three different groups are used for the extrapolation. At physical pion mass, the extrapolated gA are all smaller than the experimental value.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
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 the...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.展开更多
基金Supported by National Natural Science Foundation of China(11475186)Sino-German CRC 110(NSFC 11621131001)
文摘The extrapolation of nucleon axial charge gA is investigated within the framework of heavy baryon chiral effective field theory. The intermediate octet and decuplet baryons are included in the one loop calculation. Finite range regularization is applied to improve the convergence in the quark-mass expansion. The lattice data from three different groups are used for the extrapolation. At physical pion mass, the extrapolated gA are all smaller than the experimental value.
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.
基金Supported by Fundamental Research Funds for Central Universities (2010SCU23002)Startup Grant from the Institute of Nuclear Science and Technology of Sichuan University
文摘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.
