The study of the negative pion production in neutron-proton collisions at beam momenta below 1.8 GeV/c

作者：Sarantsev V V^*; Ermakov K N; Kochenda L M; Medvedev V I; Nikonov V A; Rogachevsky O V; Sarantsev A V; Sherman S G; Trofimov V A; Vasiliev A A

来源：European Physical Journal A, 2010, 43(1): 11-16.

DOI：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 the deuterium target. Partial-wave event-by-event analysis based on the maximum likelihood method was applied to determine contributions of different partial waves to the pion production process. A 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 the (S-1(0))(pp)pi channel provides us with a good tool for the determination of the pp S-wave scalar scattering length in the final state which was found to be a(pp) = -7.5 +/- 0.3 fm.

• 出版日期2010-1