Pionic Deuterium
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. Le, Bigot, M. Nekipelov, J. M. F. dos Santos, Ph. Schmid, S. Schlesser, L.M., Simons, M. Trassinelli, J. F. C. A. Veloso, and J. Zmeskal
TL;DR
This paper reports high-precision measurements of the strong interaction effects in pionic deuterium, providing new data on the pion-deuteron scattering length and pion production threshold.
Contribution
It presents the first high-statistics remeasurement of the pionic deuterium shift and broadening using advanced spectroscopic techniques.
Findings
Shift: -2325±31 meV (repulsive)
Width: 1171+23/-49 meV
Provides precise pion-deuteron scattering length
Abstract
The strong interaction shift and broadening in pionic deuterium have been remeasured with high statistics by means of the (3p-1s) X-ray transition using the cyclotron trap and a high-resolution crystal spectrometer. Preliminary results are (-2325+/-31) meV (repulsive) for the shift and (1171+23/-49} meV for the width, which yields precise values for the pion-deuteron scattering length and the threshold parameter for pion production.
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