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20 April 2024

» arxiv » 0906.1946

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The study of the negative pion production in neutron-proton collisions at beam momenta below 1.8 GeV/c
V.V. Sarantsev ; K.N. Ermakov ; L.M. Kochenda ; V.I. Medvedev ; V.A. Nikonov ; O.V. Rogachevsky ; A.V. Sarantsev ; S.G. Sherman ; V.A. Trofimov ; A.A. Vasiliev ;
Date:	10 Jun 2009
Abstract:	A detailed investigation of the reaction np -> pppi^{-} 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 -> pppi^{-} and pp -> pppi^{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}=-7.5pm 0.3 fm.
Source:	arXiv, 0906.1946
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