Abstract
Recently a form for the propagator of a spin-3/2 particle has been proposed, which differs from the one normally used in the literature. We show that the new propagator gives unique predictions for the contributions to the processes πN → πN, γN → πN, γd → pn from tree diagrams with a Δ(1231) intermediate state, whereas the old propagator gives results which depend on unknown parametersy, z arising from off-mass-shell γNΔ, πNΔ couplings. We show further that, with the new propagator, one obtains a very simple model of low-energy pion-nucleon scattering, while the contributions to pion photoproduction and deuteron photodisintegration fit very well into models for these processes. These properties of the new propagator lead to the conclusion that it should be used in an effective treatment of Δ exchange, in preference to the usual treatment.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
