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arXiv 2012.14656hep-phnucl-th
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$e^+e^-$对撞机类时质子电磁形状因子的新拟合

New fit of time-like proton electromagnetic form factors from $e^+e^-$ colliders

Egle Tomasi-Gustafsson, Andrea Bianconi, Simone Pacetti

摘要:

从BaBar,BESIII和CMD-3合作的质子形状因子在类时区域的数据进行检查,有连贯的质子结构的信息。在湮灭截面的振荡,以前观察到的,确定更好的精度。讨论了首次确定的各个形状因子的模量、它们的比率和湮灭反应$e^+e^-\to\bar p p$的角度不对称性。拟合的横截面上的可用数据,有效的形状因子,和形状因子比,允许提出一个描述的电和磁的时间一样的形状因子从阈值到最高的动量。

英文摘要:

The data on the proton form factors in the time-like region from the BaBar, BESIII and CMD-3 Collaborations are examined to have coherent pieces of information on the proton structure. Oscillations in the annihilation cross section, previously observed, are determined with better precision. The moduli of the individual form factors, determined for the first time, their ratio and the angular asymmetry of the annihilation reaction $e^+e^-\to\bar p p$ are discussed. Fiits of the available data on the cross section, the effective form factor, and the form factor ratio, allow to propose a description of the electric and magnetic time-like form factors from the threshold up to the highest momenta.

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