arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 0811.2589hep-ph
收藏

评“σ介子的双光子衰变”

Comment on "Two-photon decay of the sigma meson"

Eef van Beveren, Frieder Kleefeld, George Rupp, Michael D. Scadron

摘要:

我们评论了Giacosa、Gutsche和Lyobovitskij最近发表的一篇论文,其中认为$σ$介子的夸克偶素解释应该产生比通常假设的小得多的双光子衰变宽度。这种差异的原因是过渡振幅中的一个术语,这是规范不变性所必需的,据称在文献中经常被忽略,包括本作者的工作。在这里,我们证明他们的说法是不正确的,在夸克水平的线性$σ$模型的背景下,最近提取的实验值$Γ_{σ\to2γ}=(4.1\pm0.3)$ keV是兼容的$q\bar{q}$分配的$σ$,假设介子环也考虑在内。

英文摘要:

We comment on a recent paper by Giacosa, Gutsche, and Lyobovitskij, in which it is argued that a quarkonium interpretation of the $σ$ meson should give rise to a much smaller two-photon decay width than commonly assumed. The reason for this claimed discrepancy is a term in the transition amplitude, necessary for gauge invariance, which allegedly is often omitted in the literature, including the work of the present authors. Here we show their claims to be incorrect by demonstrating, in the context of the Quark-Level Linear $σ$ Model, that the recently extracted experimental value $Γ_{σ\to2γ}=(4.1\pm0.3)$ keV is compatible with a $q\bar{q}$ assignment for the $σ$, provided that meson loops are taken into account as well.

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。

↑