Naik P, Rademacker J, Asner D M, Edwards K W, Reed J, Robichaud A N, Tatishvili G, Briere R A, Vogel H, Onyisi P U E, Rosner J L, Alexander J P, Cassel D G, Duboscq J E, Ehrlich R, Fields L, Galik R S, Gibbons L, Gray R, Gray S W, Hartill D L, Heltsley B K, Hertz D, Hunt J M, Kandaswamy J, Kreinick D L, Kuznetsov V E, Ledoux J, Mahlke-Krüger H, Mohapatra D, Patterson J R, Peterson D, Riley D, Ryd A, Sadoff A J, Shi X, Stroiney S, Sun W M, Wilksen T, Athar S B, Yelton J, Rubin P, Mehrabyan S, Lowrey N, Selen M, White E J, Wiss J, Mitchell R E, Shepherd M R, Besson D, Pedlar T K, Cronin-Hennessy D, Gao K Y, Hietala J, Kubota Y, Klein T, Poling R, Scott A W, Zweber P, Dobbs S, Metreveli Z, Seth K K, Tan B J Y, Tomaradze A, Libby J, Martin L, Powell A, Wilkinson G, Mendez H, Ge J Y, Miller D H, Pavlunin V, Sanghi B, Shipsey I P J, Xin B, Adams G S, Hu D, Moziak B, Napolitano J, He Q, Insler J, Muramatsu H, Park C S, Thorndike E H, Yang F, Artuso M, Blusk S, Khalil S, Li J, Mountain R, Randrianarivony K, Sultana N, Skwarnicki T, Stone S, Wang J C, Zhang L M, Bonvicini G, Cinabro D, Dubrovin M, Lincoln A, Ecklund K M
University of Bristol, Bristol BS8 1TL, United Kingdom.
Phys Rev Lett. 2009 Feb 13;102(6):061801. doi: 10.1103/PhysRevLett.102.061801. Epub 2009 Feb 11.
Using psi(2S)-->pi;{+}pi;{-}J/psi, J/psi-->gammaeta;{'} events acquired with the CLEO-c detector at the CESR e;{+}e;{-} collider, we make the first observations of the decays eta;{'}-->pi;{+}pi;{-}pi;{0} and eta;{'}-->pi;{+}pi;{-}e;{+}e;{-}, measuring absolute branching fractions (37_{-9};{+11}+/-4)x10;{-4} and (25_{-9};{+12}+/-5)x10;{-4}, respectively. For eta;{'}-->pi;{+}pi;{-}pi;{0}, this result probes the mechanism of isospin violation and the roles of pi;{0}/eta/eta;{'}-mixing and final state rescattering in strong decays. We also set upper limits on branching fractions for eta;{'} decays to pi;{+}pi;{-}micro;{+}micro;{-}, 2(pi;{+}pi;{-}), pi;{+}pi;{-}2pi;{0}, 2(pi;{+}pi;{-})pi;{0}, 3(pi;{+}pi;{-}), and invisible final states.
利用在CESR正负电子对撞机上用CLEO - c探测器获取的ψ(2S)→π⁺π⁻J/ψ、J/ψ→γη′事件，我们首次观测到η′→π⁺π⁻π⁰和η′→π⁺π⁻e⁺e⁻衰变，分别测量了绝对分支比(37₋₉⁺₁₁±4)×10⁻⁴和(25₋₉⁺₁₂±5)×10⁻⁴。对于η′→π⁺π⁻π⁰，该结果探究了同位旋破缺机制以及π⁰/η/η′混合和强衰变中末态再散射的作用。我们还设定了η′衰变为π⁺π⁻μ⁺μ⁻、2(π⁺π⁻)、π⁺π⁻2π⁰、2(π⁺π⁻)π⁰、3(π⁺π⁻)和不可见末态的分支比上限。
