/ Theory-Nucl arXiv:1112.3808

Differential cross section and analysing power of the quasi-free $pn \to {pp}_s \pi^-$ reaction at 353 MeV

Dymov, S. (Dubna, JINR) ; Azaryan, T. (Dubna, JINR) ; Barsov, S. (St. Petersburg, INP) ; Baru, V. (Moscow, ITEP) ; Benati, P. (INFN, Ferrara) ; Bertelli, S. (INFN, Ferrara) ; Chiladze, D. (Julich, Forschungszentrum) ; Dzyuba, A. (St. Petersburg, INP) ; Gebel, R. (Julich, Forschungszentrum) ; Goslawski, P. (Munster U.) ; Guidoboni, G. (INFN, Ferrara) ; Hanhart, C. (Julich, Forschungszentrum) ; Hartmann, M. (Julich, Forschungszentrum) ; Kacharava, A. (Julich, Forschungszentrum) ; Khoukaz, A. (Munster U.) ; Komarov, V. (Dubna, JINR) ; Kulessa, P. (Cracow, INP) ; Kulikov, A. (Dubna, JINR) ; Kurbatov, V. (Dubna, JINR) ; Lenisa, P. (INFN, Ferrara) ; Lensky, V. (Moscow, ITEP) ; Lomidze, N. (Tbilisi State U.) ; Lorentz, B. (Julich, Forschungszentrum) ; Macharashvili, G. (Tbilisi State U.) ; Mielke, M. (Munster U.) ; Mikirtytchiants, S. (St. Petersburg, INP) ; Merzliakov, S. (Julich, Forschungszentrum) ; Ohm, H. (Julich, Forschungszentrum) ; Papenbrock, M. (Munster U.) ; Rathmann, F. (Julich, Forschungszentrum) ; Serdyuk, V. (Julich, Forschungszentrum) ; Shmakova, V. (Dubna, JINR) ; Stroher, H. (Julich, Forschungszentrum) ; Tabidze, M. (Tbilisi State U.) ; Tsirkov, D. (Dubna, JINR) ; Trusov, S. (Forschungszentrum Dresden Rossendorf) ; Uzikov, Yu. (Dubna, JINR) ; Valdau, Yu. (Julich, Forschungszentrum) ; Wilkin, C. (University Coll. London)

Abstract: 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.

Keyword(s): Negative pion production ; Neutron proton collisions ; Amplitude analysis

Web-Page: http://inspirehep.net/record/1081783/files/arXiv:1112.3808.pdf; http://inspirehep.net/record/1081783/files/pig1.png; http://inspirehep.net/record/1081783/files/pig2.png; http://inspirehep.net/record/1081783/files/pig3.png; http://inspirehep.net/record/1081783/files/pig4.png

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