Spin observables for the pd <-> pi+ t process around the Delta resonance

Abstract

The proton analyzing power Ay0 and the deuteron tensor analyzing power T20 are evaluated for the pd <-> pi+ t process, in the energy region around and above the Delta resonance. These calculations extend a previous analysis of the excitation function and differential cross-section, based on a model embodying one-- and two-body p-wave absorption mechanisms and isobar excitation. The three-nucleon bound state and the pd scattering state are evaluated through Faddeev techniques for both the Bonn and Paris potentials. The spin variables exhibit a greater sensitivity to the number of included three-nucleon partial waves than the cross-sections, while the role played by the initial-- or final-state interactions appears to be small. The results for the tensor analyzing power at backward angles show a non-negligible dependence on the potentials employed, consistently with what has been previously found for the cross-sections. The calculation of spin observables gives a clear indication that other reaction mechanisms (presumably s-wave two-body absorption) have to be included in the model, in order to reproduce the experimental data below the Delta-resonance, in analogy with the simpler pp <-> pi+ d process.

14 pages, REVTeX, plus 6 figs., PostScript (PRC, to be published)

References in corpus (2)

• The pd <--> pi+ t reaction around the Delta resonance
• Photodisintegration of the triton with realistic potentials

Cited by in corpus (5)

• Simultaneous Measurements of the $p+d\to (A=3)+\pi$ Reactions
• Why is the three-nucleon force so odd?
• Polarized Proton Pionic Capture in Deuterium as a Probe of 3N Dynamics
• Isoscalar off-shell effects in threshold pion production from pd collisions
• pp <-> pi+ d process at low energy: Interplay between s-- and p-wave mechanisms