发表机构
INFN, Sezione di Pavia; Dipartimento di Fisica “Alessandro Volta”, Università di Pavia; Division of Theoretical Physics, Ruđer Bošković Institute; Dipartimento di Fisica e Scienze della Terra, Università di Ferrara; INFN, Sezione di Ferrara; INFN, Galileo Galilei Institute for Theoretical Physics（意大利国家核物理研究所帕维亚分部; 帕维亚大学亚历山德罗·沃尔塔物理系; 鲁德·博什科维奇研究所理论物理部; 费拉拉大学地球与物理学系; 意大利国家核物理研究所费拉拉分部; 意大利国家核物理研究所伽利略·伽利莱理论物理研究所）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
研究辐射π介子对产生的次领头阶FsQED修正，通过该方法计算并与其他结果比较，展示对可观测量的影响，纳入额外修正，研究相关机制，新特性在蒙特卡罗事件发生器中实现，可评估π介子 - 光子相互作用建模影响。
AI 中文摘要
我们在FsQED方法内计算了辐射返回过程\(e^+ e^- \to \pi^+ \pi^- \gamma\)的次领头阶修正，以将π介子形状因子嵌入圈积分计算中。我们将结果与分解标量QED方法的结果以及我们之前在广义矢量介子主导模型中得到的预测进行比较。展示了结构相关修正对味工厂辐射返回实验中各种感兴趣可观测量的数值影响。还纳入了超出FsQED的领头修正并给出初步估计，研究了质心能量在\(\phi\)介子共振附近对末态辐射有贡献的其他机制，如辐射\(\phi\)衰变，相关数值结果对KLOE实验有意义。这些新特性已在蒙特卡罗事件发生器BabaYaga@NLO中实现，可用于评估辐射返回测量中π介子 - 光子相互作用建模的影响。
英文摘要
We compute the next-to-leading order corrections to the radiative return process $e^+ e^- \to π^+ π^- γ$ using a dispersive representation of the pion form factor for the calculation of loop integrals. We compare our results with those of the factorised scalar QED approach, as well as with previous predictions obtained by us in the generalised vector meson dominance model. We show the numerical impact of the structure-dependent corrections on various observables of interest for radiative return experiments at flavour factories. Following recent input from the literature, we include in our calculation also corrections due to neutral pseudoscalar poles and we provide a first estimate of such contributions. We also investigate additional mechanisms contributing to final-state radiation at center-of-mass energies around the $ϕ$-meson resonance, such as radiative $ϕ$ decays, presenting numerical results that are relevant for the KLOE experiment. These novel features are implemented in the Monte Carlo event generator BabaYaga@NLO, which can now be used to evaluate the impact of the modelling of pion-photon interaction in radiative return measurements.
CommentsTitle updated. All numerical results remain unaffected from the previous version
