Observation of the doubly radiative decay eta ' -> gamma gamma pi(0)

Z. Haddadi, N. Kalantar-Nayestanaki, M. Kavatsyuk, H. Löhner, J. Messchendorp, M. Tiemens, BESIII Collaboration

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Abstract

Based on a sample of 1.31 billion J/psi events collected with the BESIII detector, we report the study of the doubly radiative decay eta' -> gamma gamma pi(0) for the first time, where the eta' meson is produced via the J/psi -> gamma eta' decay. The branching fraction of eta' -> gamma gamma pi(0) inclusive decay is measured to be B(eta' -> gamma gamma pi(0))(Incl) = (3.20 +/- 0.07(stat) +/- 0.23(sys)) x 10(-3), while the branching fractions of the dominant process eta' -> gamma omega and the non-resonant component are determined to be B(eta' -> gamma omega) x B(omega -> gamma pi(0)) = (23.7 +/- 1.4(stat) +/- 1.8(sys)) x 10(-4) and B(eta' -> gamma gamma pi(0))(NR) = (6.16 +/- 0.64(stat) +/- 0.67(sys)) x 10(-4), respectively. In addition, the M-gamma gamma(2)-dependent partial widths of the inclusive decay are also presented.
Original languageEnglish
Article number012005
JournalPhysical Review D
Volume96
Issue number1
DOIs
Publication statusPublished - 26-Jul-2017

Keywords

  • ANOMALOUS WARD IDENTITIES
  • AMPLITUDES
  • CHIRAL PERTURBATION-THEORY

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