The SPEAR e + e - collider at Stanford observed two narrow resonances. Consider the second one the (2S), where the expression in parenthesis

The SPEAR e⁺e^- collider at Stanford observed two narrow ψ resonances. Consider the second one the ψ(2S), where the expression in parenthesis is the mass in GeV. Bound P-wave cc states called χ_c were also discovered. Consider in particular the reaction e+e^-→ψ(2S)→χ + γ, followed by χ→π⁺ π^-  in which the photon and the two pions wage detected. The energy of the gamma is E_γ = 0.29 GeV. Determine the of the χ_c and the possible values of its mass, spin, parity, charge conjugation and isospin? Assume that the radioactive decay to be E1 (i.e. the photon takes away overall one unit of angular momentum and negative parity).