Abstract
We derive the dependence of the helicity amplitudes of the Roper resonance assuming that it is (1) a radially excited state, and (2) a G hybrid baryon. Our study shows that for a hybrid baryon assignment the magnitude of the transverse helicity amplitude decreases rapidly as increases, and the longitudinal helicity amplitude vanishes. This behavior is quite different from the predictions of the quark potential model, which assumes a radially excited assignment. Comparison with data shows that the hybrid interpretation of the Roper resonance is favored. Future experiments at the Continuous Electron Beam Accelerator Facility should be able to clearly distinguish between these two possible assignments.
- Received 12 August 1991
DOI:https://doi.org/10.1103/PhysRevD.46.70
©1992 American Physical Society