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arXiv 2005.11564hep-ph
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最奇异的非奇异介子毕竟不是那么奇异

The strangest non-strange meson is not so strange after all

Saša Ceci, Marin Vukšić, Branimir Zauner

摘要:

宽非奇异介子$f_0$(500)被认为是非Breit-Wigner共振。一般认为,如果共振是广泛的,它很难被描述的Breit-Wigner形式。我们在这里表明,这对宽Z玻色子和窄得多的$Δ(1232)$都不成立,并解释了为什么$f_0$(500)与它们完全吻合。它们之间的关键区别归结为一个参数:我们从阈值看到共振极点的角度,这解释了背景,残留物相位以及极点和Breit-Wigner参数之间的差异。

英文摘要:

The broad non-strange meson $f_0$(500) is considered to be a non-Breit-Wigner resonance. It is generally assumed that if a resonance is broad it can hardly be described by a Breit-Wigner form. We show here that is not true neither for the broad Z boson, nor for the much narrower $Δ(1232)$, and explain why the $f_0$(500) fits with them perfectly. Key differences between them boil down to a single parameter: the angle at which we see the resonance pole from the threshold, which explains the background, the residue phase, and the difference between the pole and Breit-Wigner parameters.

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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