AI 中文总结
本文利用495 pb⁻¹的扫描数据，测量ψ(2S)附近e+e-→p\bar{p}的截面等，得到强电磁振幅相对相位与分支分数，结果支持相位普适性。
AI 中文摘要
本文采用质心系能量范围为3.58 GeV至3.71 GeV、对应积分亮度为495 pb⁻¹的数据，研究ψ(2S)→p\bar{p}衰变中强振幅与电磁振幅之间的相对相位。给出了ψ(2S)附近质子-反质子对的产生截面和有效形状因子，首次填补了ψ(2S)共振附近的实验结果空白，且结果与此前BESIII和BaBar的结果一致。从截面线形中提取的相对相位为Φ_{g,γ}=(105.9±9.4)°或Φ_{g,γ}=(-105.3±9.1)°，对应得到ψ(2S)→p\bar{p}的两个分支分数解：ℬ=(3.21±0.13)×10⁻⁴和ℬ=(3.47±0.19)×10⁻⁴。这些结果支持相位的普适性，并为其 underlying机制提供了新见解。
英文摘要
This paper uses the data corresponding to an integrated luminosity of $495$~pb$^{-1}$ in the center-of-mass energy region from 3.58~GeV to 3.71~GeV to study the relative phase between strong and electromagnetic amplitudes in the $ψ(2S)\to p\bar{p}$ decay. The cross sections and the effective form factors around $ψ(2S)$ of proton-antiproton pairs are presented thereby filling the gap in the experimental results around the $ψ(2S)$ resonance for the first time, and the results are consistent with the previous BESIII and BaBar results. The relative phase is extracted from the cross-section line shape as $Φ_{g,γ}=(105.9\pm9.4)^\circ$ or $Φ_{g,γ}=(-105.3\pm9.1)^\circ$. Correspondingly, two solutions for the $ψ(2S)\to p\bar{p}$ branching fractions are obtained as $\mathcal{B}=(3.21\pm0.13)\times10^{-4}$ and $\mathcal{B}=(3.47\pm0.19)\times10^{-4}$. These results support the universality of the phase and provide new insights into its underlying mechanism.
Comments22 pages, 5 figures, 4 tables
