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arXiv 2301.00645hep-ph
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处理不稳定系统的Bethe-Salpeter理论的发展

Development of Bethe-Salpeter theory for dealing with unstable system

Xiaozhao Chen, Xiaofu Lü

AI总结:

本文发展了Bethe-Salpeter理论以研究不稳定两体共振态,通过推广Mandelstam方法计算任意末态能量下的衰变矩阵元,并创新费曼图以展现色散关系,成功应用于研究奇特介子分子态。

摘要:

在相对论量子场论框架下,两体束缚态的齐次Bethe-Salpeter方程解无法描述不稳定系统,因此我们发展了Bethe-Salpeter理论来研究被视为不稳定两体系统的共振态。基于Bethe-Salpeter波函数,我们考虑了由总哈密顿量决定的两体束缚态的时间演化。任意衰变道的总矩阵元用海森堡绘景表示,并将Mandelstam方法推广以计算相对于末态能量任意值的束缚态间的矩阵元。我们对费曼图作了一些创新,使色散关系的关键特征能更清晰地展现。量子场论中的这一新共振理论被用于研究被视为不稳定介子-介子分子态的奇特粒子。

英文摘要:

In the framework of relativistic quantum field theory, the solution of homogeneous Bethe-Salpeter equation for two-body bound state can not describe unstable system, so we develop Bethe-Salpeter theory to investigate resonance which is regarded as an unstable two-body system. Based on Bethe-Salpeter wave function, we consider the time evolution of two-body bound state determined by the total Hamiltonian. The total matrix element for arbitrary decay channel is expressed in terms of the Heisenberg picture, and Mandelstam's approach is generalized to calculate the matrix element between bound states with respect to arbitrary value of the final state energy. Some innovations to Feynman diagram are made so that the key features of dispersion relation can be more clearly exhibited. This new resonance theory in quantum field theory is applied to investigate exotic particle which is considered as an unstable meson-meson molecular state.

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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