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27 April 2024

» arxiv » 1304.3678

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Measurement of spin observables in the quasi-free np-> {pp}_s pi- reaction at 353 MeV
S. Dymov ; V. Shmakova ; T. Azaryan ; S. Barsov ; V. Baru ; P. Benati ; D. Chiladze ; A. Dzyuba ; R. Engels ; M. Gaisser ; R. Gebel ; K. Grigoryev ; P. Goslawski ; G. Guidoboni ; M. Hartmann ; A. Kacharava ; V. Kamerdzhiev ; A. Khoukaz ; V. Komarov ; P. Kulessa ; A. Kulikov ; V. Kurbatov ; A. Lehrach ; P. Lenisa ; V. Lensky ; N. Lomidze ; B. Lorentz ; G. Macharashvili ; R. Maier ; D. Mchedlishvili ; S. Merzliakov ; M. Mielke ; M. Mikirtychyants ; S. Mikirtytchiants ; M. Nioradze ; D. Oellers ; H. Ohm ; A. Polyanskiy ; M. Papenbrock ; D. Prasuhn ; F. Rathmann ; V. Serdyuk ; H. Seyfarth ; E. Steffens ; H.J. Stein ; H. Stockhorst ; H. Ströher ; M. Tabidze ; S. Trusov ; D. Tsirkov ; Yu. Uzikov ; Yu. Valdau ; Ch. Weidemann ; C. Wilkin ; P. Wüstner ; Q. J. Ye ; M. Zhabitsky ; ANKE Collaboration ;
Date:	12 Apr 2013
Abstract:	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}.
Source:	arXiv, 1304.3678
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