阈值时dpi -> NN转变强度的精密度测定
Precision determination of the dpi -> NN transition strength at threshold
摘要：
一种不寻常但有效的方法来确定阈值的dpi -> NN跃迁强度是利用强子基态加宽的π氘，可通过X射线光谱。展宽主要由真实吸收通道dpi- -> nn决定，它通过电荷对称性和细致平衡与s波π介子产生pp -> dpi+有关。使用奇异原子避免了在生产实验中必要时对截面进行库仑修正的问题。我们的专用测量发现（1171+23/-49）meV的加宽产生（252+5/-11）\mub。
英文摘要：
An unusual but effective way to determine at threshold the dpi -> NN transition strength is to exploit the hadronic ground-state broadening in pionic deuterium, accessible by x-ray spectroscopy. The broadening is dominated by the true absorption channel dpi- -> nn, which is related to s-wave pion production pp -> dpi+ by charge symmetry and detailed balance. Using the exotic atom circumvents the problem of Coulomb corrections to the cross section as necessary in the production experiments. Our dedicated measurement finds (1171+23/-49) meV for the broadening yielding (252+5/-11) \mub.
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