First measurement of the beam asymmetry Sigma 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 KLambda and ωp production. Their decisive identification requires additional theoretical and experimental efforts.
Evidence for narrow resonant structures atW≈1.68GeVandW≈1.72GeVin real Compton scattering off the proton
GIARDINA, Giorgio 42Investigation
;MANDAGLIO, GIUSEPPEInvestigation
;
2015-01-01
Abstract
First measurement of the beam asymmetry Sigma 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 KLambda and ωp production. Their decisive identification requires additional theoretical and experimental efforts.File in questo prodotto:
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