晶格核力的截止效应
Cutoff effects on lattice nuclear forces
摘要：
本文用格点量子色动力学方法研究了截止效应对核力的影响。用HAL QCD方法从Nambu-Bethe-Salpeter（NBS）波函数确定了双核子力。采用N_f = 2的三叶草费米子组态，在固定物理体积L^3 x T =（2.5 fm）^3 x 5 fm，对应于m_π= 1.1 GeV的大夸克质量下，在三种格点间距a = 0.108，0.156，0.215 fm下进行了格点量子色动力学模拟.我们观察到，虽然离散伪影出现在近距离的电位的一部分，它被抑制在长距离区域。还提出了相移和散射长度的截止依赖性。
英文摘要：
We present a lattice QCD study for the cutoff effects on nuclear forces. Two-nucleon forces are determined from Nambu-Bethe-Salpeter (NBS) wave functions using the HAL QCD method. Lattice QCD simulations are performed employing N_f = 2 clover fermion configurations at three lattice spacings of a = 0.108, 0.156, 0.215 fm on a fixed physical volume of L^3 x T = (2.5 fm)^3 x 5 fm with a large quark mass corresponding to m_π= 1.1 GeV. We observe that while the discretization artifact appears at the short range part of potentials, it is suppressed at the long distance region. The cutoff dependence of the phase shifts and scattering length is also presented.
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