Observation of the doubly radiative decay η′ →γγπ0

The BELLE collaboration

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7 Citations (Scopus)

Abstract

Based on a sample of 1.31 billion J/ψ events collected with the BESIII detector, we report the study of the doubly radiative decay η′→γγπ0 for the first time, where the η′ meson is produced via the J/ψ→γη′ decay. The branching fraction of η′→γγπ0 inclusive decay is measured to be B(η′→γγπ0)Incl=(3.20±0.07(stat)±0.23(sys))×10-3, while the branching fractions of the dominant process η′→γω and the nonresonant component are determined to be B(η′→γω)×B(ω→γπ0)=(23.7±1.4(stat)±1.8(sys))×10-4 and B(η′→γγπ0)NR=(6.16±0.64(stat)±0.67(sys))×10-4, respectively. In addition, the Mγγ2-dependent partial widths of the inclusive decay are also presented.

Original languageEnglish
Article number012005
Number of pages8
JournalPhysical Review D
Volume96
Issue number1
DOIs
Publication statusPublished - 26 Jul 2017

Keywords

  • CHIRAL PERTURBATION-THEORY
  • ANOMALOUS WARD IDENTITIES
  • AMPLITUDES

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