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

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arxiv 1003.4153 v1 pith:YL5VONMP submitted 2010-03-22 nucl-ex

Th. Strauch , F. D. Amaro , D. F. Anagnostopoulos , P. Bühler , D. S. Covita , H. Gorke , D. Gotta , A. Gruber
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A. Hirtl P. Indelicato E.-O. LeBigot M. Nekipelov J. M. F. dos Santos S. Schlesser Ph. Schmid L. M. Simons M. Trassinelli J.F.C.A. Veloso J. Zmeskal
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keywords broadeningproductionstrengththresholdtransitionabsorptionaccessibleatom
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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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