Lattice QCD study of the heavy-heavy-light quark potential
Lattice QCD study of the heavy-heavy-light quark potential
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DOI：
10.1103/physrevd.78.014513
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发表时间：
2008-06
影响因子：
5
通讯作者：
A. Yamamoto;H. Suganuma;H. Iida
中科院分区：
文献类型：
--
作者：
A. Yamamoto;H. Suganuma;H. Iida
研究了SU（3）格点猝灭QCD中的重-重-轻夸克（QQq）势，讨论了有限质量价夸克在夸克间势中的作用。在16{sup 4}格点β =6.0处，用标准规范作用量和O（a）改进的Wilson费米子作用量对四个跳跃参数进行了Monte Carlo模拟.为了统计上的改进，规范配置是固定的库仑规范。我们计算了QQq系统的势能作为重夸克间距离R的函数，在R <= 0.8 fm的范围内。用库仑加线性势很好地描述了QQq势，并且两个重夸克之间的有效弦张力显著小于弦张力{sigma}{approx_equal}0.89 GeV/fm。一般认为，有限质量的价夸克的作用减小了重子中两夸克间的禁闭力。
We study the heavy-heavy-light quark (QQq) potential in SU(3) quenched lattice QCD, and discuss one of the roles of the finite-mass valence quark in the interquark potential. Monte Carlo simulations are performed with the standard gauge action on the 16{sup 4} lattice at {beta}=6.0 and the O(a)-improved Wilson fermion action at four hopping parameters. For statistical improvement, the gauge configuration is fixed with the Coulomb gauge. We calculate the potential energy of QQq systems as a function of the inter-heavy-quark distance R in the range of R{<=}0.8 fm. The QQq potential is well described with a Coulomb plus linear potential, and the effective string tension between the two heavy quarks is significantly smaller than the string tension {sigma}{approx_equal}0.89 GeV/fm. It would generally hold that the effect of the finite-mass valence quark reduces the inter-two-quark confinement force in baryons.