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

Abstract

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.

4 pages, 2 figures, 1 table

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Cited by in corpus (13)

• Pionic deuterium
• Hadronic shift in pionic hydrogen
• Effective Field Theory calculations of $NN\to NN\pi$
• The isotopic effects in the scattering and the kinetics of the atomic cascade
• Line shape analysis of the K$\beta$ transition in muonic hydrogen
• Threshold pion production in proton-proton collisions at NNLO in chiral EFT
• Impulse approximation in nuclear pion production reactions: absence of a one-body operator
• The muon capture rate on hydrogen and the values of $g_A$ and $g_{\pi NN}$
• On the width of the $K^{-}$D atom ground state
• Impulse approximation in the n p --> d pi^0 reaction reexamined
• Pion absorption from the lowest atomic orbital in 2H, 3H and 3He
• Charge Symmetry Breaking and Nuclear Pion Production Reactions
• Demonstration of deuterium's enhanced sensitivity to symmetry violations governed by the Standard-Model Extension