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
TL;DR
This paper investigates eta photoproduction off the neutron, revealing a resonant structure at W ~ 1.675 GeV that could indicate a baryon resonance or a new narrow state, with implications for understanding nucleon excitations.
Contribution
It reports the observation of a resonant structure in eta photoproduction off the neutron, suggesting possible new baryon states or narrow resonances not previously characterized.
Findings
Resonant structure observed at W ~ 1.675 GeV
Possible indication of a narrow baryon resonance
Strong photocoupling to the neutron
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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