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arXiv 1206.3098hep-phhep-exnucl-ex
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omega --> pi0 gamma* 和phi --> pi0 gamma* 色散理论中的过渡形状因子

omega --> pi0 gamma* and phi --> pi0 gamma* Transition form factors in dispersion theory

Sebastian P. Schneider, Bastian Kubis, Franz Niecknig

摘要:

基于色散理论,我们计算了ω--> pi 0 gamma* 和phi --> pi 0 gamma* 电磁跃迁形状因子,仅依赖于先前对相应的三π衰变和π矢量形状因子的色散分析。我们将我们的研究结果与NA 60合作最近对欧米茄--> pi 0 mu+ mu-衰变谱的测量进行比较,并强烈鼓励对Okubo-Zweig-Iizuka禁止的phi --> pi 0 l+ l-衰变进行实验研究,以了解这些转变中发现的与矢量-介子主导的强烈偏差形状因子。

英文摘要:

We calculate the omega --> pi0 gamma* and phi --> pi0 gamma* electromagnetic transition form factors based on dispersion theory, relying solely on a previous dispersive analysis of the corresponding three-pion decays and the pion vector form factor. We compare our findings to recent measurements of the omega --> pi0 mu+ mu- decay spectrum by the NA60 collaboration, and strongly encourage experimental investigation of the Okubo-Zweig-Iizuka-forbidden phi --> pi0 l+ l- decays in order to understand the strong deviations from vector-meson dominance found in these transition form factors.

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