%0 Journal Article
%T Measurement of spin observables in the quasi-free np-> {pp}_s pi- reaction at 353 MeV
%A S. Dymov
%A V. Shmakova
%A T. Azaryan
%A S. Barsov
%A V. Baru
%A P. Benati
%A D. Chiladze
%A A. Dzyuba
%A R. Engels
%A M. Gaisser
%A R. Gebel
%A K. Grigoryev
%A P. Goslawski
%A G. Guidoboni
%A M. Hartmann
%A A. Kacharava
%A V. Kamerdzhiev
%A A. Khoukaz
%A V. Komarov
%A P. Kulessa
%A A. Kulikov
%A V. Kurbatov
%A A. Lehrach
%A P. Lenisa
%A V. Lensky
%A N. Lomidze
%A B. Lorentz
%A G. Macharashvili
%A R. Maier
%A D. Mchedlishvili
%A S. Merzliakov
%A M. Mielke
%A M. Mikirtychyants
%A S. Mikirtytchiants
%A M. Nioradze
%A D. Oellers
%A H. Ohm
%A A. Polyanskiy
%A M. Papenbrock
%A D. Prasuhn
%A F. Rathmann
%A V. Serdyuk
%A H. Seyfarth
%A E. Steffens
%A H. J. Stein
%A H. Stockhorst
%A H. Str£¿her
%A M. Tabidze
%A S. Trusov
%A D. Tsirkov
%A Yu. Uzikov
%A Yu. Valdau
%A Ch. Weidemann
%A C. Wilkin
%A P. W¨¹stner
%A Q. J. Ye
%A M. Zhabitsky
%A for the ANKE Collaboration
%J Physics
%D 2013
%I arXiv
%R 10.1103/PhysRevC.88.014001
%X The transverse spin correlations A_{x,x} and A_{y,y} have been measured in the pol{d} pol{p} -> p_spec {pp}_s pi- reaction at COSY-ANKE at 353 MeV per nucleon. Here {pp}_s denotes a proton-proton pair with low excitation energy, which is dominantly in the 1S0 state. By measuring three protons in the final state it was possible to extract events where there was a spectator proton p_spec so that the reaction could be interpreted in terms of quasi-free pol{n} pol{p} -> {pp}_s pi-. The proton analyzing power in this reaction was also deduced from this data set by averaging over the polarization of the deuteron beam. The values of A_y^p were shown to be consistent with a refined analysis of our earlier results obtained with a polarized proton incident on a deuterium target. Taking these data in combination with our earlier measurements of the differential cross sections and analyzing powers in the pol{p} p -> {pp}_s pi^0 reaction, a more robust partial wave decomposition was achieved. Three different acceptable solutions were found and the only way of resolving this ambiguity without further theoretical input would be through a measurement of the mixed spin-correlation parameter A_{x,z}.
%U http://arxiv.org/abs/1304.3678v2