Precision determination of the dpi -> NN transition strength at threshold

Details Precision determination of the dpi -> NN transition strength at threshold Precision determination of the dpi -> NN transition strength at threshold

2010-03-22

arxiv.org/abs/1003.4153v1

Phys.Rev.Lett.104:142503,2010

Physics

Nuclear Physics

Nuclear Experiment

4 pages, 2 figures, 1 table

Scientific paper

10.1103/PhysRevLett.104.142503

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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