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arXiv 2109.10068hep-latnucl-th
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用格点量子色动力学研究核相互作用

Approaching nuclear interactions with lattice QCD

Marc Illa

摘要:

原子核构成了宇宙中可见物质的大部分;直接从强相互作用的基础理论量子色动力学(QCD)中获得原子核性质和原子核之间相互作用的第一性原理描述是核物理界的主要目标之一。虽然这个理论是在近50年前建立的,但低能QCD的复杂性排除了最简单强子系统的解析解,更不用说核力的特征了。在本论文中,我们遵循格点量子色动力学方法,通过大规模数值计算,在离散时空中非微扰地求解QCD。具体地说,我们研究了奇异度从0到-4的两个八重态重子之间的相互作用,并在低能下研究了夸克质量大于物理夸克质量的情况,同时限制了与两重子相互作用有关的无π介子有效场的低能系数,包括那些导致SU(3)味对称破缺的系数.

英文摘要:

Nuclei make up the majority of the visible matter in the Universe; obtaining a first principles description of the nuclear properties and interactions between nuclei directly from the underlying theory of the strong interaction, Quantum Chromodynamics (QCD), is one of the main goals of the nuclear physics community. Although the theory was established nearly fifty years ago, the complexities of QCD at low energies precludes analytical solutions of the simplest hadronic systems, let alone the features of the nuclear forces. In this thesis we follow the lattice QCD approach, according to which QCD is solved non-perturbatively in a discretized space-time via large-scale numerical calculations. Specifically, the interactions between two octet baryons, with strangeness ranging from 0 to -4, are studied at low energies with larger-than-physical quark masses, and the low-energy coefficients in pionless effective field thepry relevant for two-baryon interactions, including those responsible for SU(3) flavor-symmetry breaking, are constrained.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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