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Observation of psi(3686) -> eta ' e(+)e(-)

BESIII Collaboration, Haddadi, Z., Kalantar-Nayestanaki, N., Kavatsyuk, M., Messchendorp, J. G. & Tiemens, M., 10-Aug-2018, In : Physics Letters B. 783, p. 452-458 7 p.

Research output: Contribution to journalArticleAcademicpeer-review

Using a data sample of 448.1 x 10(6) psi(3686) events collected with the BESIII detector at the BEPCII collider, we report the first observation of the electromagnetic Dalitz decay psi(3686) -> eta'e(+)e(-), with significances of 7.0 sigma and 6.3 sigma when reconstructing the eta' meson via its decay modes eta' -> gamma pi(+)pi(-) and eta' -> pi(+)pi(-) eta (eta -> gamma gamma), respectively. The weighted average branching fraction is determined to be B(psi(3686) -> eta'e(+)e(-)) = (1.90 +/- 0.25 +/- 0.11) x 10(-6), where the first uncertainty is statistical and the second systematic. (C) 2018 The Author. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP(3).
Original languageEnglish
Pages (from-to)452-458
Number of pages7
JournalPhysics Letters B
Volume783
Publication statusPublished - 10-Aug-2018

    Keywords

  • BESIII, KLOE DETECTOR, DECAYS, E(+)E(-), ETA-E(+)E(-), PSEUDOSCALAR, GENERATOR, OMEGA, PHI

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