Study Of The Doubly Radiative Decay J-Psi-]Gamma-Gamma-Rho-0

We present a study of the decay sequence Jψ→γX, X→γρ0, ρ0→π+π−, based on 5.8 × 106 produced Jψ collected by the Mark III detector at the SLAC storage ring SPEAR. In the γρ0 mass spectrum, we find two peaks with masses and widths consistent with the axial-vector mesons f1(1285) and f1(1420) that have recently been observed in two-photon collisions. Fits to the angular distributions confirm that the first peak is an axial-vector state, but are unable to distinguish between the f1(1420) or the pseudoscalar η(1430) for the high-mass peak. Product branching fractions for both objects are presented.Received 17 October 1989DOI:https://doi.org/10.1103/PhysRevD.41.1410©1990 American Physical Society