Observation of narrow N+(1685) and N0(1685) resonances in γ N → η π N reactions
V. Kuznetsov+*, F. Mammoliti*#, F. Tortorici*#, V. Bellini*#, V. Brio*#, A. Gridnev+, N. Kozlenko+, G. Russo*#, M. L. Sperduto*#, V. Sumachev+, C. Sutera#
+Petersburg Nuclear Physics Institute, 188300 Gatchina, Russia
*INFN - Sezione di Catania, I-95123 Catania, Italy
#Dipartimento di Fisica ed Astronomia, Universitàdi Catania, I-95123 Catania, Italy
Abstract
Observation of a narrow structure at 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
γ N → π η N reactions from GRAAL seems to reveal the signals of
both N+(1685) and N0(1685) resonances.