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Study of two-photon decays of pseudoscalar mesons via J/Psi radiative decays
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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2018 (English)In: Physical Review D: covering particles, fields, gravitation, and cosmology, ISSN 2470-0010, E-ISSN 2470-0029, Vol. 97, no 7, article id 072014Article in journal (Refereed) Published
Abstract [en]

Using a sample of 4.48 x 10(8) Psi(3686) events collected with the BESIII detector at the BEPCII collider, we study the two-photon decays of the pseudoscalar mesons pi(0,) eta , eta' , eta(1405), eta(1475), eta(1760), and X(1835) in J/Psi radiative decays using Psi(3686) -> pi(+) pi(-) J/Psi events. The pi(0), eta, and eta' mesons are clearly observed in the two-photon mass spectra, and the branching fractions are determined to be B(J/Psi -> gamma pi(0) -> 3 gamma) = (3.57 +/- 0.12 +/- 0.16) x 10(-5), B(J/Psi -> gamma eta -> 3 gamma) = (4.42 +/- 0.04 +/- 0.18) x 10(-4), and B(J/Psi -> gamma eta' -> 2 gamma) = (1.26 +/- 0.02 +/- 0.05) x 10(-4), where the first error is statistical and the second is systematic. No clear signal for eta(1405), eta(1475), eta(1760) or X(1835) is observed in the two- photon mass spectra, and upper limits at the 90% confidence level on the product branching fractions are obtained.

Place, publisher, year, edition, pages
2018. Vol. 97, no 7, article id 072014
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Subatomic Physics Astronomy, Astrophysics and Cosmology
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URN: urn:nbn:se:uu:diva-354945DOI: 10.1103/PhysRevD.97.072014ISI: 000430909600001OAI: oai:DiVA.org:uu-354945DiVA, id: diva2:1223457
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Swedish Research CouncilAvailable from: 2018-06-25 Created: 2018-06-25 Last updated: 2018-06-25Bibliographically approved

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