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arXiv 0811.2630hep-lat
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2+1味格点量子色动力学的物理点上和物理点外模拟的PACS-CS结果

PACS-CS results for 2+1 flavor lattice QCD simulation on and off the physical point

Yoshinobu Kuramashi

摘要:

我们报道了PACS-CS计划,重点是在物理点上直接模拟2+1味QCD,以及在物理点外用SU(2)和SU(3)手征微扰理论对介子和重子质量进行手征分析。用O(a)改进的Wilson夸克作用量和Iwasaki规范作用量产生夸克。采用改进的DDHMC算法对上下夸克进行了模拟,并对奇异夸克实现了UV滤波的PHMC算法。我们研究了赝标介子扇区的SU(2)和SU(3)手征展开到NLO的收敛行为,其中上下夸克质量范围为3 - 24 MeV,奇夸克质量选择在物理值附近.低能常数的拟合结果与最近由其他团体获得的结果进行了比较。通过比较物理点上测量的物理量与外推法估计的物理量,讨论了在物理点上直接模拟的重要性。

英文摘要:

We report on the PACS-CS project focusing on a direct simulation of 2+1 flavor QCD on the physical point and chiral analysis of meson and baryon masses off the physical point with both the SU(2) and SU(3) chiral perturbation theories. Configurations are generated with the O(a)-improved Wilson quark action and the Iwasaki gauge action. The up-down quark is simulated by employing the DDHMC algorithm with several improvements and the UV-filtered PHMC algorithm is implemented for the strange quark. We investigate the convergence behaviors of the SU(2) and SU(3) chiral expansions up to NLO for the pseudoscalar meson sector, where the up-down quark mass ranges from 3 MeV to 24 MeV and the strange quark mass is chosen around the physical value. The fit results for the low energy constants are compared with those recently obtained by other groups. We also discuss the importance of the direct simulation at the physical point by comparing the physical quantities measured on the physical point with those estimated by the extrapolation method.

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