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首页> 外文期刊>Physical review, D >Lattice QCD determination of neutron-antineutron matrix elements with physical quark masses
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Lattice QCD determination of neutron-antineutron matrix elements with physical quark masses

机译：物理夸克质量的格子QCD测定中子-反中子矩阵元素

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Matrix elements of six-quark operators are needed to extract new physics constraints from experimental searches for neutron-antineutron oscillations. This work presents, in detail, the first lattice quantum chromodynamics calculations of the necessary neutron-antineutron transition matrix elements including calculation methods and discussions of systematic uncertainties. Implications of isospin and chiral symmetry on the matrix elements, power counting in the isospin limit, and renormalization of a chiral basis of six-quark operators are discussed. Calculations are performed with a chiral-symmetric discretization of the quark action and physical light quark masses in order to avoid the need for chiral extrapolation. Nonperturbative renormalization is performed, including a study of lattice cutoff effects. Excited-state effects are studied using two nucleon operators and multiple values of source-sink separation. Results for the dominant matrix elements are found to be significantly larger compared to previous results from the MIT bag model. Future calculations are needed to fully account for systematic uncertainties associated with discretization and finite-volume effects but are not expected to significantly affect this conclusion.
机译：需要六夸克算子的矩阵元素来从实验搜索中子-反中子振荡中提取新的物理约束。这项工作详细介绍了必要的中子-反中子跃迁矩阵元素的第一次晶格量子色动力学计算，包括计算方法和系统不确定性的讨论。讨论了同位旋和手性对称性对矩阵元素的影响，同位旋极限中的功率计数以及六夸克算子的手性基础的重新规范化。为了避免手性外推，对夸克作用和物理轻夸克质量进行了手性对称离散化计算。进行了非扰动重新归一化，包括对晶格截止效应的研究。使用两个核子算子和源-库分离的多个值来研究激发态效应。发现与MIT袋模型的先前结果相比，主要矩阵元素的结果明显更大。需要进行未来的计算以充分考虑与离散化和有限体积效应相关的系统不确定性，但预计不会显着影响此结论。

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