Differential cross section and analysing power of the quasi-free pn ->   {pp}_s pi- reaction at 353 MeV
  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. 
S.Dymov, T.Azaryan, S.Barsov, V.Baru, P.Benati, S.Bertelli,   D.Chiladze, A.Dzyuba, R.Gebel, P.Goslawski, G.Guidoboni, C.Han...
nucl-ex nucl-th