arXiv:nucl-th/0411030·v1·Nuclear Theory
Polarized Proton Pionic Capture in Deuterium as a Probe of 3N Dynamics
Luciano Canton (1 and 2)🇮🇹 · Leonid G. Levchuk (2 and 3) ((1) Istituto Nazionale di Fisica Nucleare, Padova, Italy, (2) Dipartimento di Fisica dell'Universita, Padova, Italy, (3) Kharkov Institute of Physics and Technology, Kharkov, Ukraine)🇮🇹
Abstract
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.
Comments: 9 pages, 5 figures