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Measurement of branching fractions for psi(3686) -> gamma eta ', gamma eta, and gamma pi(0)
Inst High Energy Phys, Beijing 100049, Peoples R China..
RAS, GI Budker Inst Nucl Phys SB, BINP, Novosibirsk 630090, Russia.;Novosibirsk State Univ, Novosibirsk 630090, Russia. PNPI, Kurchatov Inst, NRC, Gatchina 188300, 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 5, article id 052003Article in journal (Refereed) Published
Abstract [en]

Using a data sample of 448 x 10(6) psi(3686) events collected with the BESIII detector operating at the BEPCII storage ring, the decays psi(3686) -> gamma eta and psi(3686) -> gamma pi(0) are observed with a statistical significance of 7.3 sigma and 6.7 sigma, respectively. The branching fractions are measured to be B(psi(3686) -> gamma eta) = (0.85 +/- 0.18 +/- 0.05) x 10(-6) and B(psi(3686) ->gamma pi(0)) = (0.95 +/- 0.16 +/- 0.05) x 10(-6). In addition, we measure the branching fraction of psi(3686) -> gamma eta' to be B(psi(3686) -> gamma eta') = (125.1 +/- 2.2 +/- 6.2)x10(-6), which represents an improvement of precision over previous results.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC , 2017. Vol. 96, no 5, article id 052003
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Subatomic Physics
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URN: urn:nbn:se:uu:diva-336820DOI: 10.1103/PhysRevD.96.052003ISI: 000411579700001OAI: oai:DiVA.org:uu-336820DiVA, id: diva2:1168233
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Swedish Research CouncilAvailable from: 2017-12-20 Created: 2017-12-20 Last updated: 2017-12-20Bibliographically approved

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Andersson, Walter IkegamiJohansson, TordKupsc, AndrzejLi, CuiPapenbrock, MichaelPettersson, JoachimSchönning, KarinWolke, Magnus

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Nuclear Physics
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Physical Review D: covering particles, fields, gravitation, and cosmology
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