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arXiv 0906.3497nucl-thhep-ph
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等时和光锋动力学中π介子环的等价性

Equivalence of pion loops in equal-time and light-front dynamics

Chueng-Ryong Ji, W. Melnitchouk, A. W. Thomas

摘要:

我们证明了核子性质的光阵面修正和等时修正公式的等价性。作为一个具体的例子,我们考虑了由π介子环装扮的核子的自能,对于赝矢量和赝标量π介子-核子耦合。我们导出了光阵面上自能的主导和次主导非解析行为,并在等时量子化的静止标架和无限动量标架中以及在明显协变的表述中明确地证明了它们的等价性。

英文摘要:

We demonstrate the equivalence of the light-front and equal-time formulations of pionic corrections to nucleon properties. As a specific example, we consider the self-energy of a nucleon dressed by pion loops, for both pseudovector and pseudoscalar pion-nucleon couplings. We derive the leading and next-to-leading nonanalytic behavior of the self-energy on the light-front, and show explicitly their equivalence in the rest frame and infinite momentum frame in equal-time quantization, as well as in a manifestly covariant formulation.

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