Precision determination of the dpi -> NN transition strength at threshold
Th. Strauch, F. D. Amaro, D. F. Anagnostopoulos, P. B\"uhler, D. S., Covita, H. Gorke, D. Gotta, A. Gruber, 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, and J. Zmeskal
TL;DR
This paper presents a novel method using pionic deuterium x-ray spectroscopy to precisely determine the dpi to NN transition strength at threshold, avoiding Coulomb correction issues in traditional production experiments.
Contribution
It introduces an innovative approach exploiting hadronic broadening in pionic deuterium to measure the transition strength directly at threshold.
Findings
Measured broadening: 1171+23/-49 meV
Derived cross section: 252+5/-11 μb
Method reduces Coulomb correction uncertainties
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.
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