Polarization phenomena in the reaction p+α-->p+π0+α
Abstract
We present a general analysis of polarization phenomena for three-body processes (in noncoplanar kinematics), in terms of a P- and T-odd acoplanarity parameter. The spin structure of the matrix element and the polarization phenomena contain new contributions, with respect to binary processes, which can be conveniently expressed as functions of this parameter. We apply this formalism to the reaction p+α-->p+π0+α, in view of characterizing the different mechanisms involved and studying the excitation of the Roper resonance. We find that the polarization transfer coefficient Dnn, where n--> is normal to the proton scattering plane, is especially sensitive to the spin of the exchanged particle.
- Publication:
-
Physical Review C
- Pub Date:
- May 2001
- DOI:
- 10.1103/PhysRevC.63.054001
- Bibcode:
- 2001PhRvC..63e4001R
- Keywords:
-
- 24.70.+s;
- 25.55.Ci;
- 24.30.Gd;
- 25.10.+s;
- Polarization phenomena in reactions;
- Elastic and inelastic scattering;
- Other resonances;
- Nuclear reactions involving few-nucleon systems