Observation of ψ(3686)→ηe+e

BESIII Collaboration

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Using a data sample of 448.1×106 ψ(3686) events collected with the BESIII detector at the BEPCII collider, we report the first observation of the electromagnetic Dalitz decay ψ(3686)→ηe+e, with significances of 7.0σ and 6.3σ when reconstructing the η meson via its decay modes η→γπ+π and η→π+πη (η→γγ), respectively. The weighted average branching fraction is determined to be B(ψ(3686)→ηe+e)=(1.90±0.25±0.11)×10−6, where the first uncertainty is statistical and the second systematic.

Original languageEnglish
Pages (from-to)452-458
Number of pages7
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume783
DOIs
Publication statusPublished - 10 Aug 2018

Keywords

  • BESIII
  • Charmonium
  • Dalitz decay
  • ee Annihilation
  • GENERATOR
  • KLOE DETECTOR
  • DECAYS
  • E(+)E(-)
  • PHI
  • PSEUDOSCALAR
  • e(+)e(-) Annihilation
  • OMEGA
  • ETA-E(+)E(-)

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