Optical Analysis of the 900-MeVπ−−pResonance
- 24 May 1965
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 138 (4B), B938-B942
- https://doi.org/10.1103/physrev.138.b938
Abstract
A model for elastic scattering near the 900-MeV resonance is proposed, consisting of a Breit-Wigner term together with an optical background. The optical background is chosen to fit experimental data beyond the 900-MeV resonance; the spin of the Breit-Wigner term is then adjusted to give an elastic cross section in agreement with experiment. A distorted-wave Born-approximation calculation shows a spin- resonance term to be in agreement with the data, in accord with the usual spin assignment. Parity of the Breit-Wigner term cannot be decided from the elastic energy spectra and angular distributions alone; however, if the elastic resonance is identified with the observed resonance near 900 MeV, one finds a suitable branching ratio only for the choice. The resulting angular distributions, as well as the production cross section as a function of energy, agree generally with experiment. It is therefore proposed that the 900-MeV resonance has negative parity relative to the proton.
Keywords
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