标题： eta和eta-prime介子质量的估计在Nf=2+1格点QCD中 显示英文标题

标题： An estimate of the eta and eta-prime meson masses in Nf=2+1 lattice QCD

摘要： 在Nf=2+1格点QCD中，使用非微扰O(a)改进的威尔逊夸克作用量和伊瓦萨基RG改进的胶子作用量，通过CP-PACS/JLQCD配置，在beta=1.83（格点间距为0.122 fm）的16^3 x 32格点上估计了eta介子和eta- prime介子的质量。我们应用随机噪声估计技术结合平滑方法，评估了10种上/下夸克和奇异夸克质量组合下的味SU(2)单态伪标量算符和奇异伪标量算符之间的关联函数。然后对关联矩阵进行对角化，以识别质量本征态的信号。将基态和第一激发态的质量外推到物理点，得到m_eta= 0.545(16) GeV和m_eta-prime= 0.871(46) GeV，接近eta和eta-prime质量的实验值。 显示英文摘要

摘要： Masses of the eta and eta-prime mesons are estimated in Nf=2+1 lattice QCD with the non-perturbatively O(a) improved Wilson quark action and the Iwasaki RG-improved gluon action, using CP-PACS/JLQCD configurations on a 16^3 x 32 lattice at beta=1.83 (lattice spacing is 0.122 fm). We apply a stochastic noise estimator technique combined with smearing method to evaluate correlators among flavor SU(2) singlet pseudoscalar operators and strange pseudoscalar operators for 10 combinations of up/down and strange quark masses. The correlator matrix is then diagonalized to identify signals for mass eigenstates. Masses of the ground state and the first excited state extrapolated to the physical point are m_eta= 0.545(16) GeV and m_eta-prime= 0.871(46) GeV, being close to the experimental values of the eta and eta-prime masses.