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Observation of the Dalitz decay eta ' -> gamma e(+)e(-)
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2015 (English)In: Physical Review D, ISSN 1550-7998, Vol. 92, no 1, 012001Article in journal (Refereed) Published
Abstract [en]

We report the first observation of the Dalitz decay eta' -> gamma e(+)e(-), based on a data sample of 1.31 billion J/psi events collected with the BESIII detector. The eta' mesons are produced via the J/psi -> gamma eta' decay process. The ratio (eta' -> gamma e(+)e(-))/Gamma (eta' -> gamma gamma) is measured to be (2.13 +/- 0.09(stat) +/- 0.07(sys)) x 10(-2). This corresponds to a branching fraction B(eta' -> gamma e(+)e(-)) = (4.69 +/- 0.20(stat) +/- 0.23(sys)) x 10(-4). The transition form factor is extracted and different expressions are compared to the measured dependence on the e(+)e(-) invariant mass. The results are consistent with the prediction of the vector meson dominance model.

Place, publisher, year, edition, pages
2015. Vol. 92, no 1, 012001
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Physical Sciences
URN: urn:nbn:se:uu:diva-259108DOI: 10.1103/PhysRevD.92.012001ISI: 000357162400002OAI: oai:DiVA.org:uu-259108DiVA: diva2:843494
Available from: 2015-07-29 Created: 2015-07-27 Last updated: 2015-07-29Bibliographically approved

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Johansson, TordKupsc, AndrzejPettersson, JoachimSchönning, KarinWolke, Magnus
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