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

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Abstract

Using 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.

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Keywords

Branching fractions (Nuclear physics), J/psi particle (J/ψ), Vector-meson dominance, Chiral perturbation theory

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"This work is supported in part by the Ministry of Science and Technology of China under Contract No. 2009CB825200; Joint Funds of the National Natural Science Foundation of China under Contracts No. 11079008, No. 11179007, No. U1232101, No. U1232107, No. U1332201; National Natural Science Foundation of China (NSFC) under Contracts No. 10625524, No. 10821063, No. 10825524, No. 10835001,No.10935007, No. 11125525, No. 11235011, No. 11175189; the Chinese Academy of Sciences (CAS) Large-Scale Scientific Facility Program; CAS under Contracts No. KJCX2-YW-N29, No. KJCX2-YW-N45; 100 Talents Program of CAS; German Research Foundation DFG under Contract No. Collaborative Research Center CRC-1044; Istituto Nazionale di Fisica Nucleare, Italy; Ministry of Development of Turkey under Contract No. DPT2006 K-120470; U.S. Department of Energy under Contracts No. DE-FG02-04ER41291, No. DE-FG02-05ER41374, No. DE-FG02-94ER40823, No. DESC0010118; U.S. National Science Foundation; University of Groningen (RuG) and the Helmholtzzentrum fuer Schwerionenforschung GmbH (GSI), Darmstadt; WCU Program of National Research Foundation of Korea under Contract No. R32-2008-000-10155-0."

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©2014 American Physical Society.

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