Precision determination of the dpi -> NN transition strength at threshold
Nuclear Experiment
2010-04-14 v1
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.
Keywords
Cite
@article{arxiv.1003.4153,
title = {Precision determination of the dpi -> NN transition strength at threshold},
author = {Th. Strauch and F. D. Amaro and D. F. Anagnostopoulos and P. Bühler and D. S. Covita and H. Gorke and D. Gotta and A. Gruber and A. Hirtl and P. Indelicato and E. -O. LeBigot and M. Nekipelov and J. M. F. dos Santos and S. Schlesser and Ph. Schmid and L. M. Simons and M. Trassinelli and J. F. C. A. Veloso and J. Zmeskal},
journal= {arXiv preprint arXiv:1003.4153},
year = {2010}
}
Comments
4 pages, 2 figures, 1 table