Holographic Baryons Static Properties and Form Factors from Gauge/String Duality
Holographic Baryons Static Properties and Form Factors from Gauge/String Duality
复制标题
DOI：
10.1143/ptp.120.1093
复制
发表时间：
2008-06
影响因子：
--
通讯作者：
K. Hashimoto;T. Sakai;S. Sugimoto
中科院分区：
文献类型：
--
作者：
K. Hashimoto;T. Sakai;S. Sugimoto
本文在D4/D8膜配置的基础上，利用QCD的全息对偶研究重子的性质，其中重子用孤立子描述。我们首先确定孤子解的渐近行为，这使我们能够评估与U（N_f）_L \times U（N_f）_R手征对称性相关的定义明确的电流。利用这些流，我们计算了重子的电荷半径和磁矩等静态量，并进行了定量的实验检验。强调了不仅核子，而且激发态重子，如δ，N（1440），N（1535）等，可以在这个模型中进行系统的分析。我们还调查了形状因子，发现我们的形状因子与经验上建立的结果吻合得很好。利用这些形状因子，可以确定模型中重子-重子-介子无穷塔之间的有效立方耦合常数。从这些结果的一些物理意义进行了讨论。
In this paper, we study properties of baryons by using a holographic dual of QCD on the basis of the D4/D8-brane configuration, where baryons are described by a soliton. We first determine the asymptotic behavior of the soliton solution, which allows us to evaluate well-defined currents associated with the U(N_f)_L \times U(N_f)_R chiral symmetry. Using the currents, we compute static quantities of baryons such as charge radii and magnetic moments, and make a quantitative test with experiments. It is emphasized that not only the nucleon but also excited baryons, such as \Delta, N(1440), N(1535) etc., can be analyzed systematically in this model. We also investigate the form factors and find that our form factors agree well with the results that are well-established empirically. With the form factors, the effective baryon-baryon-meson cubic coupling constants among their infinite towers in the model can be determined. Some physical implications following from these results are discussed.