Partial wave analyses of J/ψ→γπ+π- and γπ0π0

Results are presented on J/psi radiative decays to pi(+)pi(-) and pi(0)pi(0) based on a sample of 58M J/psi events taken with the BES II detector. Partial wave analyses are carried out using the relativistic covariant tensor amplitude method in the 1.0 to 2.3 GeV/c(2) pi pi mass range. There are conspicuous peaks due to the f(2)(1270) and two 0(++) states in the 1.45 and 1.75 GeV/c(2) mass regions. The first 0(++) state has a mass of 1466 +/- 6 +/- 20 MeV/c(2), a width of 108(-11)(+14) +/- 25 MeV/c(2), and a branching fraction B(J/psi -> gamma f(0)(1500) -> gamma pi(+)pi(-)) = (0.67 +/- 0.02 +/- 0.30) x 10(-4). Spin 0 is strongly preferred over spin 2. The second 0(++) state peaks at 1765(-3)(+4) +/- 13 MeV/c(2) with a width of 145 +/- 8 +/- 69 MeV/c(2). If this 0(++) is interpreted as coming from f(0)(1710), the ratio of its branching fractions to pi pi and K (K) over bar is 0.41(-0.17)(+0.11). (c) 2006 Elsevier B.V. All rights reserved.