Observation of η'→π⁺π⁻π⁺π⁻ and η'→π⁺π⁻π⁰π⁰

Ablikim, M.Achasov, M. N.Ai, X. C.Albayrak, O.Albrecht, M.Ambrose, D. J.An, F. F.Lou, Xinchou2014-10-172014-10-172014-06-252014-06-250031-9007http://hdl.handle.net/10735.1/4123Using a sample of 1.3 x 10⁹ J/ψ events collected with the BESIII detector, we report the first observation of η'→π⁺π⁻π⁺π⁻ and η'→π⁺π⁻π⁰π⁰. The measured branching fractions are ℬ(η'→π⁺π⁻π⁺π⁻) = [8.53 ± 0.69(stat.) ± 0.64(syst.)] x 10⁻⁵ and ℬ(η'→π⁺π⁻π⁰π⁰) = [1.82 ± 0.35(stat.) ± 0.18(syst.)] x 10⁻⁴, which are consistent with theoretical predictions based on a combination of chiral perturbation theory and vector-meson dominance.©2014 American Physical Society.Branching fractions (Nuclear physics)J/psi particle (J/ψ)Vector-meson dominanceChiral perturbation theoryObservation of η'→π⁺π⁻π⁺π⁻ and η'→π⁺π⁻π⁰π⁰ArticleAblikim, M., M. N. Achasov, X. C. Ai, O. Albayrak, et al. 2014. "Observation of η'→π⁺π⁻π⁺π⁻ and η'→π⁺π⁻π⁰π⁰." Physical Review Letters 112(25), doi:10.1103/PhysRevLett.112.25180111225251801