Observation of the doubly radiative decay $\eta^{\prime}\to \gamma\gamma\pi^0$ - INSPIRE

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Observation of the doubly radiative decay $\eta^{\prime}\to \gamma\gamma\pi^0$

BESIII

Collaboration

Dec 17, 2016

8 pages

Published in:

Phys.Rev.D 96 (2017) 1, 012005

Published: Jul 26, 2017

e-Print:

1612.05721 [hep-ex]

DOI:

10.1103/PhysRevD.96.012005

PDG:

{{\mathit \eta}^{\,'}{(958)}}

\rightarrow

{{\mathit \pi}^{0}}{{\mathit \gamma}}{{\mathit \gamma}}

Experiments:

BEPC-BES-III

View in:

ADS Abstract Service

reference search28 citations

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Abstract: (APS)

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.

13.40.Gp
13.40.Hq
13.20.Jf
14.40.Be
electron positron: annihilation
electron positron: colliding beams
J/psi(3100): radiative decay
eta(958): radiative decay
photon: pair production
eta(958): branching ratio: measured

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