Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-06-10
Eur.Phys.J.A43:11-16,2010
Physics
High Energy Physics
High Energy Physics - Phenomenology
6 pages, 6 figures
Scientific paper
10.1140/epja/i2009-10891-5
A detailed investigation of the reaction np -> pp\pi^{-} has been carried out using the data obtained with the continuous neutron beam produced by charge exchange scattering of protons off a deuterium target. A partial wave event-by-event based maximum likelihood analysis was applied to determine contributions of different partial waves to the pion production process. The combined analysis of the np -> pp\pi^{-} and pp -> pp\pi^{0} data measured in the same energy region allows us to determine the contribution of isoscalar partial waves (I=0) in the momentum range from 1.1 up to 1.8 GeV/c. The decay of isoscalar partial waves into (^1S_0)_{pp}\pi$ channel provides a good tool for a determination of the pp S-wave scalar scattering length in the final state which was found to be a_{pp}=-7.5\pm 0.3 fm.
Ermakov K. N.
Kochenda L. M.
Medvedev V. I.
Nikonov V. A.
Rogachevsky O. V.
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