Observation of Narrow $N^{+}(1685)$ and $N^0(1685)$ Resonances in ${\hat{I}}^{3}N\to \hat{I}\cdot \ddot{I}€N$ Reactions

Abstract

Observation of a narrow structure at $W\sim 1.68$ GeV in the excitation functions of some photon- and pion-induced reactions may signal a new narrow isospin-1/2 $N(1685)$ resonance. New data on the ${\hat{I}}^{3}N\to \ddot{I}€\hat{I}\cdot N$ reactions from GRAAL seems to reveal the signals of both $N^{+}(1685)$ and $N^0(1685)$ resonances.

Published version