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arXiv 1007.1560hep-phnucl-th
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欧氏空间中Bethe-Salpeter方程的求解

Solving the Bethe-Salpeter Equation in Euclidean Space

S. M. Dorkin, L. P. Kaptari, C. Ciofi degli Atti, B. Kämpfer

摘要:

研究了欧氏空间中旋量-旋量Bethe-Salpeter(BS)方程的不同求解方法。有人认为,完整的狄拉克矩阵是最合适的基础上定义的部分振幅和数值求解得到的方程组与现实的相互作用内核。其他表示可以通过执行适当的酉变换来获得。本文讨论了求BS方程能谱的迭代法的推广,并给出了具体的计算实例。比较相对论计算与现有的实验数据和相应的非相对论的结果一起洛伦兹助推效应和相对论修正的作用进行了分析。一种新的方法有关的使用超球谐被认为是一个代表性的顶点函数适合于数值计算。

英文摘要:

Different approaches to solve the spinor-spinor Bethe-Salpeter (BS) equation in Euclidean space are considered. It is argued that the complete set of Dirac matrices is the most appropriate basis to define the partial amplitudes and to solve numerically the resulting system of equations with realistic interaction kernels. Other representations can be obtained by performing proper unitary transformations. A generalization of the iteration method for finding the energy spectrum of the BS equation is discussed and examples of concrete calculations are presented. Comparison of relativistic calculations with available experimental data and with corresponding non relativistic results together with an analysis of the role of Lorentz boost effects and relativistic corrections are presented. A novel method related to the use of hyperspherical harmonics is considered for a representation of the vertex functions suitable for numerical calculations.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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