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arXiv 0810.0876nucl-thgr-qchep-thquant-ph
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与伽莫夫态相关的共振振幅

The resonance amplitude associated with the Gamow states

R. de la Madrid

摘要:

伽莫夫态描述了量子系统的准正规模。结果表明,与伽莫夫态相关的共振振幅由复δ函数给出。在忽略能量下限的近共振近似下,这种共振振幅成为Breit-Wigner振幅。这一结果建立了伽莫夫态、中西复δ函数和Breit-Wigner振幅之间的精确联系。此外,这一结果为截面中的准洛伦兹峰是由中间不稳定粒子产生的现象提供了另一个理论依据。

英文摘要:

The Gamow states describe the quasinormal modes of quantum systems. It is shown that the resonance amplitude associated with the Gamow states is given by the complex delta function. It is also shown that under the near-resonance approximation of neglecting the lower bound of the energy, such resonance amplitude becomes the Breit-Wigner amplitude. This result establishes the precise connection between the Gamow states, Nakanishi's complex delta function and the Breit-Wigner amplitude. In addition, this result provides another theoretical basis for the phenomenological fact that the almost-Lorentzian peaks in cross sections are produced by intermediate, unstable particles.

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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