Abstract
We present an analysis of the decay J/ψ→γ4π in the final states γ and γ. The branching fractions obtained are B(J/ψ→γ)= (3.05±0.08±0.45)× and B(J/ψ→γ)=( 8.3±0.2±3.1)× for less than 2 GeV/. The 4π invariant-mass distributions extend from 1.0 to 3.0 GeV/, showing peaks at approximately 1.55 and 1.8 GeV/. In an analysis of the 4π final state we find that ≊50% of the events below 2 GeV/ are pseudoscalar ρρ, the product branching fraction of which is determined to be &→ρρ)= (4.7±0.3±0.9)×. No other significant ρρ component is found, and upper limits on the product branching fraction B(J/ψ→γX)B(X→ρρ) are presented for the theta(1690) and the states near 2.2 GeV/.
- Received 29 July 1985
DOI:https://doi.org/10.1103/PhysRevD.33.1222
©1986 American Physical Society