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Differential cross section and analysing power of of the quasi-free pn->{pp}s pi- reaction at 353 MeV

By S. Dymov, T. Azaryan, S. Barsov, V. Baru, P. Benati, S. Bertelli, D. Chiladze, A. Dzyuba, R. Gebel, P. Goslawski, G. Guidoboni, C. Hanhart, M Hartmann, A. Kacharava, A. Khoukaz, V. Komarov, P. Kulessa, A. Kulikov, V. Kurbatov, P. Lenisa, V. Lensky, N. Lomidze, B. Lorentz, G. Macharashvili, M. Mielke, S. Mikirtytchiants, S. Merzliakov, H. Ohm, M. Papenbrock, F. Rathmann, V. Serdyuk, V. Shmakova, H. Stroeher, M. Tabidze, D. Tsirkov, S. Trusov, Yu. Uzikov, Yu. Valdau and C. Wilkin


In order to establish links between p-wave pion production in nucleon-nucleon collisions and low energy three-nucleon scattering, an extensive programme of experiments on pion production is currently underway at COSY-ANKE. The final proton pair is measured at very low excitation energy, leading to an S-wave diproton, denoted here as {pp}_s. By using a deuterium target we have obtained data on the differential cross section and analysing power of the quasi-free pol{p}n -> {pp}_s pi^- reaction at 353 MeV. The spectator proton p_sp was either measured directly in silicon tracking telescopes or reconstructed using the momentum of a detected pi^-. Both observables can be described in terms of s-, p-, and d-wave pion production amplitudes. Taken together with the analogous data on the pol{p}p -> {pp}_s pi^0 reaction, full partial wave decompositions of both processes were carried out

Topics: Negative pion production, Neutron proton collisions, Amplitude analysis, 13.75.-n, 14.40.Be, 25.40.Qa
Year: 2012
DOI identifier: 10.1016/j.physletb.2012.05.002
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