Colored-hadron distribution in hadron scattering in SU(2) lattice QCD
Colored-hadron distribution in hadron scattering in SU(2) lattice QCD
复制标题
SU(2) 晶格 QCD 中强子散射的彩色强子分布
DOI：
10.1103/physrevd.94.094011
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
Toru T. Takahashi and Yoshiko Kanada-Enyo
中科院分区：
文献类型：
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作者：
Toru T. Takahashi and Yoshiko Kanada-Enyo
在色SU（2）格点QCD中，我们利用格点上的Bethe-Salpeter振幅研究了两强子散射中的色双夸克分布。在库仑规范中引入色双夸克算符，我们测量了强子散射中通过单胶子交换过程实现的两个色双夸克中间态的分量。从色双夸克分布，我们估计的优势范围的胶子（色）之间的两个紧密定位的强子交换。我们发现有色双夸克分量在短程（）处增强，并且它们的尾部表现出单指数阻尼。为了区分色交换过程中产生的真正的色双夸克分量和简单的强子基变换所产生的两个色单重强子中包含的平凡色双夸克分量，我们对人工构造的规范场进行了重复分析，其中低动量胶子分量和高动量胶子分量是解耦的，只有受限的夸克对才能共享和交换低动量胶子。我们定性地观察到相同的行为，并确认色双夸克分布的短程增强是强子散射中真正的单胶子交换源色激发。
In color SU(2) lattice QCD, we investigate colored-diquark distributions in two-hadron scatterings by means of Bethe-Salpeter amplitudes on the lattice. With colored-diquark operators in the Coulomb gauge, we measure components of two colored diquarks realized as intermediate states via one-gluon-exchange processes in hadron scattering. From the colored-diquark distributions, we estimate the dominant range of gluon (color) exchanges between two closely located hadrons. We find that the colored-diquark components are enhanced at the short range (), and their tails show the single-exponential damping. To distinguish the genuine colored-diquark components originating in the color exchange processes from trivial colored two-quark components contained in two color-singlet hadrons as a result of simple transformation of hadronic basis, we repeat the analyses on the artificially constructed gauge fields, where low- and high-momentum gluon components are decoupled and only the restricted pair of quarks can share and exchange low-momentum gluons. We observe qualitatively the same behaviors and confirm that the short-range enhancement of the colored-diquark distributions is the genuine one-gluon-exchange-origin color excitation in hadron scattering.