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Observation of χc2η′η′ and χc0,2ηη′
Inst High Energy Phys, Beijing 100049, Peoples R China..
GI Budker Inst Nucl Phys SB RAS BINP, Novosibirsk 630090, Russia.;Novosibirsk State Univ, Novosibirsk 630090, Russia..
Helmholtz Inst Mainz, Johann Joachim Becher Weg 45, D-55099 Mainz, Germany..
Bochum Ruhr Univ, D-44780 Bochum, Germany..
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2017 (English)In: Physical Review D: covering particles, fields, gravitation, and cosmology, ISSN 2470-0010, E-ISSN 2470-0029, Vol. 96, no 11, article id 112006Article in journal (Refereed) Published
Abstract [en]

Using a sample of 448.1×106 ψ(3686) events collected with the BESIII detector in 2009 and 2012, we study the decays χc0,2η′η′ and ηη′. The decays χc2η′η′, χc0ηη′ and χc2ηη′ are observed for the first time with statistical significances of 9.6σ, 13.4σ and 7.5σ, respectively. The branching fractions are determined to be Bc0η′η′)=(2.19±0.03±0.14)×10−3, Bc2η′η′)=(4.76±0.56±0.38)×10−5, Bc0ηη′)=(8.92±0.84±0.65)×10−5 and B(χc2→ηη′)=(2.27±0.43±0.25)×10−5, where the first uncertainties are statistical and the second are systematic. The precision for the measurement of Bc0η′η′) is significantly improved compared to previous measurements. Based on the measured branching fractions, the role played by the doubly and singly Okubo-Zweig-Iizuka disconnected transition amplitudes for χc0,2 decays into pseudoscalar meson pairs can be clarified.

Place, publisher, year, edition, pages
2017. Vol. 96, no 11, article id 112006
National Category
Astronomy, Astrophysics and Cosmology Subatomic Physics
Identifiers
URN: urn:nbn:se:uu:diva-339781DOI: 10.1103/PhysRevD.96.112006ISI: 000418202000001OAI: oai:DiVA.org:uu-339781DiVA, id: diva2:1183372
Funder
German Research Foundation (DFG), CRC 1044; FOR 2359Swedish Research CouncilAvailable from: 2018-02-16 Created: 2018-02-16 Last updated: 2018-02-16Bibliographically approved

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Andersson, Walter IkegamiJohansson, TordKupsc, AndrzejCaldeira Balkeståhl, LiPapenbrock, MichaelPettersson, JoachimSchoenning, KarinWolke, Magnus

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Andersson, Walter IkegamiJohansson, TordKupsc, AndrzejCaldeira Balkeståhl, LiPapenbrock, MichaelPettersson, JoachimSchoenning, KarinWolke, Magnus
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Nuclear Physics
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Physical Review D: covering particles, fields, gravitation, and cosmology
Astronomy, Astrophysics and CosmologySubatomic Physics

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