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Observation of electromagnetic Dalitz decays J/psi -> Pe(+)e(-)
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2014 (English)In: Physical Review D, ISSN 1550-7998, Vol. 89, no 9Article in journal (Refereed) Published
Abstract [en]

Based on a sample of (225.3 +/- 2.8) x 10(6) J/psi events collected with the BESIII detector, the electromagnetic Dalitz decays of J/psi -> Pe(+)e(-)(P = eta'/eta/pi(0)) are studied. By reconstructing the pseudoscalar mesons in various decay modes, the decays J/psi -> eta'e(+)e(-), J/psi -> eta e(+)e(-), and J/psi -> pi(0)e(+)e(-) are observed for the first time. The branching fractions are determined to be B(J/psi -> eta'e(+)e(-)) = (5.81 +/- 0.16 +/- 0.31) x 10(-5), B(J/psi -> eta e(+)e(-)) = (1.16 +/- 0.07 +/- 0.06) x 10(-5), and B(J/psi -> pi(0)e(+)e(-)) = (7.56 +/- 1.32 +/- 0.50) x 10(-7), where the first errors are statistical and the second ones systematic.

Place, publisher, year, edition, pages
2014. Vol. 89, no 9
National Category
Physical Sciences
URN: urn:nbn:se:uu:diva-231445DOI: 10.1103/PhysRevD.89.092008ISI: 000340272300001OAI: oai:DiVA.org:uu-231445DiVA: diva2:745225
Available from: 2014-09-10 Created: 2014-09-08 Last updated: 2014-09-10Bibliographically approved

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Johansson, TordKupsc, AndrzejSchönning, KarinWolke, Magnus
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