Evidence for Narrow N*(1685) Resonance in Quasifree Compton Scattering on the Neutron

Abstract

The first study of quasi-free Compton scattering on the neutron in the energy range of $E_{\gamma }=0.75-1.5$ GeV is presented. The data reveals a narrow peak at $W\sim 1.685$ GeV. This result, being considered in conjunction with the recent evidence for a narrow structure at $W\sim 1.68$GeV in the $\eta$ photoproduction on the neutron, suggests the existence of a new nucleon resonance with unusual properties: the mass $M\sim 1.685$GeV, the narrow width $\Gamma \le 30$MeV, and the much stronger photoexcitation on the neutron than on the proton.

arXiv commentReplaced with the version published in Phys. Rev. C

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