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Model-independent determination of the nucleon charge radius from lattice QCD

机译:与晶格QCD的核心电荷半径的模型无关测定

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摘要

Lattice QCD calculations of nucleon form factors are restricted to discrete values of the Euclidean fourmomentum transfer. Therefore, the extraction of radii typically relies on parametrizing and fitting the lattice QCD data to obtain its slope close to zero momentum transfer. We investigate a new method, which allows to compute the nucleon radius directly from existing lattice QCD data, without assuming a functional form for the momentum dependence of the underlying form factor. The method is illustrated for the case of the isovector mean-square charge radius of the nucleon and the quark-connected contributions to and for the proton and neutron, respectively. Computations are performed using a single gauge ensemble with N-f = 2 + 1 + 1 maximally twisted mass clover-improved fermions at physical quark mass and a lattice spacing of a = 0.08 fm.
机译:核心QCD核心形式因子的计算仅限于欧氏四聚体转移的离散值。 因此,RADII的提取通常依赖于参数化和装配晶格QCD数据,以获得其倾斜接近于零动量转移。 我们研究了一种新方法,该方法允许直接从现有的晶格QCD数据计算核子半径,而不假设潜在形状因子的动量依赖性的功能形式。 该方法示出了核心的等管平均电荷半径的情况和质子和中子的夸克连接的贡献。 使用具有N-F = 2 + 1 + 1个最大扭曲的质量三叶草的单个仪表集合来执行计算,在物理夸克质量和= 0.08 fm的晶格间距。

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