Study of J/ψ and ψ(3686) decays to π^+π^-η^'
PHYSICAL REVIEW D(2017)
摘要
Using the data samples of 1.31× 10^9 J/ψ events and 4.48× 10^8 ψ(3686) events collected with the BESIII detector, partial wave analyses on the decays J/ψ and ψ(3686) →π^+π^-η^' are performed with a relativistic covariant tensor amplitude approach. The dominant contribution is found to be J/ψ and ψ(3686) decays to ρη^'. In the J/ψ decay, the branching fraction B(J/ψ→ρη^') is determined to be (7.90±0.19(stat)±0.49(sys))× 10^-5. Two solutions are found in the ψ(3686) decay, and the corresponding branching fraction B(ψ(3686)→ρη^') is (1.02±0.11(stat)±0.24(sys))× 10^-5 for the case of constructive interference, and (5.69±1.28(stat)±2.36(sys))× 10^-6 for destructive interference. As a consequence, the ratios of branching fractions between ψ(3686) and J/ψ decays to ρη^' are calculated to be (12.9±1.4(stat)±3.1(sys))% and (7.2±1.6(stat)±3.0(sys))%, respectively. We also determine the inclusive branching fractions of J/ψ and ψ(3686) decays to π^+π^-η^' to be (1.36±0.02(stat)±0.08(sys))× 10^-4 and (1.51±0.14(stat)± 0.23(sys))× 10^-5, respectively.
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