B. Saghai, F. Tabakin, J. Ajaka, and P. Hoffmann-Rothe
The general nodal structure approach is applied to the recent γp⃗→ηp T-asymmetry data from ELSA. The reaction mechanism is found to require, in addition to the dominant S11 and D13 resonances, contributions from P13 and D15 resonances. This finding is confirmed within a simple dynamical approach. An indication on the presence of a predicted P13 nucleonic resonance is observed.