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arXiv 2103.09829hep-phhep-exnucl-th
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轴向矢量共振$f_1(1285)$的跃迁形状因子及其向$e^+e^-$的衰减

On the transition form factors of the axial-vector resonance $f_1(1285)$ and its decay into $e^+e^-$

Marvin Zanke, Martin Hoferichter, Bastian Kubis

摘要:

估算轴矢量中间态对强子光-光散射的贡献需要输入它们的跃迁形状因子(TFF)。由于朗道-杨定理,任何对这些TFF敏感的实验都需要涉及至少一个虚光子,这使得它们的测量变得复杂。从现象学上讲,$f_1(1285)$共振的情况最好,其信息可从$e^+e^-\to e^+e^- f_1$、$f_1\to 4π$、$f_1\to ργ$、$f_1\to ϕγ$和$f_1\to e^+e^-$获得。我们提供了一个全面的分析的$f_1$ TFFs的矢量介子主导的框架内,包括短距离的约束,以确定在何种程度上的三个独立的TFFs可以从现有的实验输入,一个先决条件,改进的轴向矢量贡献强子光的光散射的计算限制。特别是,我们专注于过程$f_1\to e^+e^-$,证据已被报道最近由SND的第一次,并讨论了未来改进的测量将产生的影响,确定的$f_1$ TFFs。

英文摘要:

Estimating the contribution from axial-vector intermediate states to hadronic light-by-light scattering requires input on their transition form factors (TFFs). Due to the Landau-Yang theorem, any experiment sensitive to these TFFs needs to involve at least one virtual photon, which complicates their measurement. Phenomenologically, the situation is best for the $f_1(1285)$ resonance, for which information is available from $e^+e^-\to e^+e^- f_1$, $f_1\to 4π$, $f_1\to ργ$, $f_1\to ϕγ$, and $f_1\to e^+e^-$. We provide a comprehensive analysis of the $f_1$ TFFs in the framework of vector meson dominance, including short-distance constraints, to determine to which extent the three independent TFFs can be constrained from the available experimental input, a prerequisite for improved calculations of the axial-vector contribution to hadronic light-by-light scattering. In particular, we focus on the process $f_1\to e^+e^-$, evidence for which has been reported recently by SND for the first time, and discuss the impact that future improved measurements will have on the determination of the $f_1$ TFFs.

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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