Contact-interaction Faddeev equation and, inter alia , proton tensor charges
Contact-interaction Faddeev equation and, inter alia , proton tensor charges
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DOI：
10.1103/physrevd.92.114034
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发表时间：
2015-09
影响因子：
5
通讯作者：
Shu-Sheng Xu;Chen Chen-Chen;Ian C.Cloet;C. Roberts;J. Segovia;H. Zong
中科院分区：
文献类型：
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作者：
Shu-Sheng Xu;Chen Chen-Chen;Ian C.Cloet;C. Roberts;J. Segovia;H. Zong
一个封闭的，保密的，戴森-施温格方程处理的矢量矢量接触相互作用是用来制定的核子和德尔塔重子的Faddeev方程，其中内核涉及动态的缀饰夸克交换，因此，其解决方案提供动量依赖的Faddeev振幅。这些解决方案进行了比较，在静态近似和QCD类制定的Faddeev内核。它们还用于计算一系列核子性质，其中包括：质子的西格玛项;未极化和纵向极化价u和d夸克部分子分布函数的单独比率的大Bjorken-x值;和质子的张量电荷，使人们能够直接确定缀饰夸克电偶极矩（EDM）对中子和质子EDM的影响。
A confining, symmetry-preserving, Dyson-Schwinger equation treatment of a vector-vector contact interaction is used to formulate Faddeev equations for the nucleon and Delta-baryon in which the kernel involves dynamical dressed-quark exchange and whose solutions therefore provide momentum-dependent Faddeev amplitudes. These solutions are compared with those obtained in the static approximation and with a QCD-kindred formulation of the Faddeev kernel. They are also used to compute a range of nucleon properties, amongst them: the proton's sigma-term; the large Bjorken-x values of separate ratios of unpolarised and longitudinally-polarised valence u- and d-quark parton distribution functions; and the proton's tensor charges, which enable one to directly determine the effect of dressed-quark electric dipole moments (EDMs) on neutron and proton EDMs.