First measurement of the beam asymmetry ETA for Compton scattering off the proton in the energy range Eγ= 0.85–1.25 GeV is presented. The data reveal two narrow structures at Eγ= 1.036 and Eγ= 1.119 GeV. They may signal narrow resonances with masses near 1.68 and 1.72 GeV, or they may be generated by the subthreshold K-LAMBDA and ωp production. Their decisive identification requires additional theoretical and experimental efforts.
Evidence for narrow resonant structures at W ≈ 1.68 GeV and W ≈ 1.72 GeV in real Compton scattering off the proton
GERVINO, Gianpiero;
2015-01-01
Abstract
First measurement of the beam asymmetry ETA for Compton scattering off the proton in the energy range Eγ= 0.85–1.25 GeV is presented. The data reveal two narrow structures at Eγ= 1.036 and Eγ= 1.119 GeV. They may signal narrow resonances with masses near 1.68 and 1.72 GeV, or they may be generated by the subthreshold K-LAMBDA and ωp production. Their decisive identification requires additional theoretical and experimental efforts.
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