2 + 1味格点量子色动力学中轻核binding energy的夸克质量依赖性研究
Study of quark mass dependence of binding energy for light nuclei in 2+1 flavor lattice QCD
摘要：
利用非微扰改进的Wilson夸克和Iwasaki规范作用量研究了2 + 1味QCD中核质量数小于或等于4的轻核的形成.夸克质量从我们以前的工作减少到对应于0.30 GeV的π介子质量。在每个多核子通道中，计算了基态相对于自由核子集合的能量移动，计算的空间尺度分别为4.3 fm和5.8 fm。从能移的体积依赖性出发，我们区分了多核子束缚态和吸引散射态。我们发现计算中所测得的所有基态都是束缚态。与以前在较大的$m_π$上的研究一样，我们的结果表明，在$m_π= 0.30$ GeV下，轻核中核子之间的有效相互作用比自然界中的强，因为结合能的结果比实验值大，并且在双中子通道中出现了实验上没有观察到的束缚态.讨论了计算中可能的系统误差来源。
英文摘要：
We investigate the formation of light nuclei with the nuclear mass number less than or equal to four in 2+1 flavor QCD using a non-perturbative improved Wilson quark and Iwasaki gauge actions. The quark mass is decreased from our previous work to the one corresponding to the pion mass of 0.30 GeV. In each multi-nucleon channel, the energy shift of the ground state relative to the assembly of free nucleons is calculated on two volumes, whose spatial extents are 4.3 fm and 5.8 fm. From the volume dependence of the energy shift, we distinguish a bound state of multi nucleons from an attractive scattering state. We find that all the ground states measured in this calculation are bound states. As in the previous studies at larger $m_π$, our result indicates that at $m_π= 0.30$ GeV the effective interaction between nucleons in the light nuclei is relatively stronger than the one in nature, since the results for the binding energies are larger than the experimental values and a bound state appears in the dineutron channel, which is not observed in experiment. Possible sources of systematic error in this calculation are discussed.
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