Evidence for excitation of two resonance states in the isovector two-baryon system with a mass of 2.2 GeV/ $c^2$статья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 26 сентября 2016 г.
Аннотация:We report on measurements of the differential cross section dσ/dΩ and the first measurement of the analyzing power Ay in the Δ(1232) excitation energy region of the reaction pp→{pp}sπ0 where {pp}s is a S01 proton pair. The experiment has been performed with the ANKE spectrometer at COSY-Jülich. The data reveal a peak in the energy dependence of the forward {pp}s differential cross section, a minimum at zero degrees of its angular distribution, and a large analyzing power. The results present a direct manifestation of two two-baryon resonance-like states with JP=2− and 0− and an invariant mass of 2.2GeV/c2.