Polarized Proton Pionic Capture in Deuterium as a Probe of 3N Dynamics
  The proton analyzing power Ay in pion production reaction pd --> pi0 3He has been calculated including one- and two-body meson production mechanisms with a proper treatment of the three-nucleon dynamics and an accurate solution of the 3N bound-state problem for phenomenological two-nucleon potentials. In the region around the Delta resonance, the structure of the analyzing power can be understood once interference effects among amplitudes describing intermediate Delta N formation in different orbital states are considered along with the additional interference with the S-wave pion production amplitudes. Then, the inclusion of three-nucleon dynamics in the initial state produces the structure of the analyzing power that has been observed experimentally. 
Luciano Canton (1 and 2) and Leonid G. Levchuk (2 and 3) ((1) Istituto   Nazionale di Fisica Nucleare, Padova, Italy, (2) Di...