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arXiv 1010.4640hep-phhep-thnucl-th
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求解Minkowski空间中双费米子的Bethe-Salpeter方程

Solving Bethe-Salpeter equation for two fermions in Minkowski space

J. Carbonell, V. A. Karmanov

摘要:

本文将我们以前为无自旋粒子发展的求解闵可夫斯基空间中Bethe-Salpeter方程的方法推广到两个费米子系统。该方法是基于Nakanishi积分表示的振幅和投影的光前平面上的方程。在投影的两个费米子内核的奇点正则化,而不修改原来的Bethe-Salpeter振幅。给出了具有标量、赝标量和无质量矢量交换核的J=0束缚态的数值解,讨论了无顶点形状因子的标量态和正电子偶素态的稳定性.结合能与欧几里德的结果非常一致。得到了Minkowski空间中相应的振幅。

英文摘要:

The method of solving the Bethe-Salpeter equation in Minkowski space, which we developed previously for spinless particles, is extended to a system of two fermions. The method is based on the Nakanishi integral representation of the amplitude and on projecting the equation on the light-front plane. The singularities in the projected two-fermion kernel are regularized without modifying the original Bethe-Salpeter amplitudes. The numerical solutions for the J=0 bound state with the scalar, pseudoscalar and massless vector exchange kernels are found. The stability of the scalar and positronium states without vertex form factor is discussed. Binding energies are in close agreement with the Euclidean results. Corresponding amplitudes in Minkowski space are obtained.

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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