Abstract
We show the important role played by the channel in the build up of the resonance due to the nontrivial enhancement produced by a singularity of a triangular loop. The is one of the dynamically generated resonances produced by the coupled-channel vector-baryon interaction. The channel was neglected in previous works but we show that it has to be incorporated into the coupled-channel formalism due to an enhancement produced by a singularity in the triangular loop with , nucleon, and as internal loop lines and and as external ones. The enhancement is of nonresonant origin but it contributes to the dynamical generation of the resonance due to the nonlinear dynamics involved in the coupled-channel mechanisms. We obtain an important increase of the total width of the resonance when the channel is included and provide predictions for the partial widths of the decays into and .
- Received 6 March 2017
- Revised 5 May 2017
DOI:https://doi.org/10.1103/PhysRevC.95.065211
©2017 American Physical Society