类时质子形状因子中的周期干涉结构
Periodic interference structures in the time-like proton form factor
摘要：
类时强子形状因子的一个有趣而难以捉摸的特征是可能存在与再散射过程相关的虚部。我们发现的证据，在最近和精确的数据测量的质子类时形状因子的BABAR合作。通过将这些数据绘制为最终质子和反质子的相对运动的3-动量的函数，在近阈值区域突出显示了系统的正弦调制。我们的分析归因于这种模式的形成强子的中心之间的相对距离为0.7-1.5 fm的再散射过程。这个距离意味着在$\bar{p}p$相互作用中有很大一部分非弹性过程，并且由于么正性，在相关的$e^+e^- \rightarrow \bar{p}p$反应中有很大的虚部。
英文摘要：
An intriguing and elusive feature of the timelike hadron form factor is the possible presence of an imaginary part associated to rescattering processes. We find evidence of that in the recent and precise data on the proton timelike form factor measured by the BABAR collaboration. By plotting these data as a function of the 3-momentum of the relative motion of the final proton and antiproton, a systematic sinusoidal modulation is highlighted in the near-threshold region. Our analysis attributes this pattern to rescattering processes at a relative distance of 0.7-1.5 fm between the centers of the forming hadrons. This distance implies a large fraction of inelastic processes in $\bar{p}p$ interactions, and a large imaginary part in the related $e^+e^- \rightarrow \bar{p}p$ reaction because of unitarity.
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