Study on Roper structure as hybrid from J/Ψ decays

The structure of Roper resonance is studied as hybrid states through decays J/Ψ→p(anti N)*, N*(anti N)* by calculating the angular distributions and decay widths. The results show that the angular distribution parameters for decays J/Ψ→p(anti N)*, N*(anti N)* are almost equal if the Roper is identified as a pure hybrid state, while their decay width are less the 1% of that for the decay J/Ψ→p(anti p), and the variance of the ratio Γ(J/Ψ→N*p)/Γ(J/Ψ→p(anti p) and Γ[J/Ψ→N*(anti N)*]/Γ[J/Ψ→p(anti p)] with the mixing parameter are presented, and also the scheme to identify the Roper structure in J/Ψ decays is discussed. (author)