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arXiv 0810.0563hep-lat
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用$O(a)$改进的Wilson夸克进行2+1味格点量子色动力学模拟

2+1 flavor lattice QCD simulation with $O(a)$-improved Wilson quarks

CS Collaboration, N. Ukita, S. Aoki, N. Ishii, K. -I. Ishikawa, N. Ishizuka, T. Izubuchi, D. Kadoh, K. Kanaya, Y. Kuramashi, Y. Namekawa, M. Okawa, Y. Taniguchi… 展开作者

CS Collaboration, N. Ukita, S. Aoki, N. Ishii, K. -I. Ishikawa, N. Ishizuka, T. Izubuchi, D. Kadoh, K. Kanaya, Y. Kuramashi, Y. Namekawa, M. Okawa, Y. Taniguchi, A. Ukawa, T. Yoshie

摘要:

给出了在O(a)非微扰改进的Wilson夸克作用量和Iwasaki规范作用量下,Nf = 2 + 1格点量子色动力学中轻强子谱的模拟细节和结果.在(2.9fm)^3盒上,使用PACS-CS计算机,以0.09 fm的格点间距进行模拟。我们采用了Luscher的区域分解HMC算法,并进行了一些改进,以减少退化的上下夸克质量的物理值。到目前为止,得到的赝标介子质量从702 MeV到156 MeV不等。我们讨论了算法的稳定性和效率。在物理点外推的光硬化谱与实验值进行了比较。我们还给出了夸克质量和赝标介子衰变常数的值。

英文摘要:

We present simulation details and results for the light hadron spectrum in N f = 2 + 1 lattice QCD with the nonperturbatively O(a)-improved Wilson quark action and the Iwasaki gauge action. Simulations are carried out at a lattice spacing of 0.09 fm on a (2.9fm)^3 box using the PACS-CS computer. We employ the Luscher's domain-decomposed HMC algorithm with several improvements to reduce the degenerate up-down quark mass toward the physical value. So far the resulting pseudoscalar meson mass is ranging from 702MeV down to 156MeV. We discuss on the stability and the efficiency of the algorithm. The light harden spectrum extrapolated at the physical point is compared with the experimental values. We also present the values of the quark masses and the pseudoscalar meson decay constants.

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