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arXiv 0811.1100hep-phhep-thnucl-th
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三体Bethe-Salpeter方程和光阵面方程中三体力的表示

Manifestation of three-body forces in three-body Bethe-Salpeter and light-front equations

V. A. Karmanov, P. Maris

摘要:

在梯形截断下求解了三个标量粒子与标量交换玻色子相互作用的Bethe-Salpeter束缚态方程和光阵面束缚态方程。与二体系统相反,在这两种方法中获得的三体结合能彼此显著不同:与梯形Bethe-Salpeter方程相比,光阵面动力学中的梯形内核欠结合大约为2倍。考虑到三体力的光阵面的方法,在飞行中产生的两个交换玻色子,我们发现,这种差异消失的大部分;对于小交换质量,得到的结合能相互吻合。

英文摘要:

Bethe-Salpeter and light-front bound state equations for three scalar particles interacting by scalar exchange-bosons are solved in ladder truncation. In contrast to two-body systems, the three-body binding energies obtained in these two approaches differ significantly from each other: the ladder kernel in light-front dynamics underbinds by approximately a factor of two compared to the ladder Bethe-Salpeter equation. By taking into account three-body forces in the light-front approach, generated by two exchange-bosons in flight, we find that most of this difference disappears; for small exchange masses, the obtained binding energies coincide with each other.

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