Evidence for narrow resonant structures at $W\approx 1.68$ and $W\approx 1.72$ GeV in real Compton scattering off the proton

Abstract

First measurement of the beam asymmetry $\Sigma$ for Compton scattering off the proton in the energy range $E_{\gamma }=0.85-1.25$ GeV is presented. The data reveals two narrow structures at $E_{\gamma }=1.036$ and $E_{\gamma }=1.119$ GeV. They may signal narrow resonances with masses near $1.68$ and $1.72$ GeV, or they may be generated by the sub-threshold $K\Lambda$ and $\omega p$ production. Their decisive identification requires additional theoretical and experimental efforts.

Published version

References in corpus (14)

• Study of the gp-->etap reaction with the Crystal Ball detector at the Mainz Microtron(MAMI-C)
• Evidence for a narrow structure at W~1.68 GeV in eta photoproduction on the neutron
• Measurement of eta photoproduction on the proton from threshold to 1500 MeV
• eta-photoproduction in the resonance energy region
• Quasi-free photoproduction of eta-mesons of the neutron
• Quasifree photoproduction of $\eta$ mesons off protons and neutrons
• Photoproduction of eta-mesons on the deuteron above S11(1535) in the presence of a narrow P11(1670) resonance
• Photoproduction of $\eta$ mesons off neutrons from a deuteron target
• Photoproduction of eta meson within a coupled-channels K-matrix approach
• Evidence for Narrow N*(1685) Resonance in Quasifree Compton Scattering on the Neutron
• New Narrow Nucleon N*(1685)
• Evidence for the J^p=1/2^+ narrow state at 1650 MeV in the photoproduction of KLambda
• To see the exotic Theta^+ baryon from interference
• Energy dependent analysis of eta-meson photoproduction on protons and neutrons without background in the energy region up to 3.4 GeV

Cited by in corpus (3)

• Light Baryon Spectroscopy
• Insight into the narrow structure in {\boldmath{$\eta$}}-photoproduction on the neutron from helicity dependent cross sections
• Photo- and electro-production of narrow exotic states: from light quarks to charm and up to bottom