Eta photoproduction off the neutron at GRAAL
V. Kuznetsov, O. Bartalini, V. Bellini, M. Castoldi, A. D'Angelo, J. -P. Didelez, R. Di Salvo, A. Fantini, D. Franco, G. Gervino, F. Ghio, B. Girolami, A. Giusa, M. Guidal, E. Hourany, R. Kunne, A. Lapik, P. Levi Sandri, D. Moricciani, L. Nicoletti, C. Randieri, N. Rudnev, G. Russo, C. Schaerf, M. -L. Sperduto, M. -C. Sutera, A. Turinge
Abstract
The gamma n -> eta n quasi-free cross section reveals a resonant structure at W ~ 1.675 GeV. This structure may be a manifestation of a baryon resonance. A priori its properties, the possibly narrow width and the strong photocoupling to the neutron, look surprising. This structure may also signal the existence of a narrow state.
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