Observation of the doubly radiative decay η′ →γγπ0

M. Ablikim; M. N. Achasov; S. Ahmed; X. C. Ai; O.  Albayrak; M. Albrecht; D. J. Ambrose; Z. Haddadi; N. Kalantar-Nayestanaki; M. Kavatsyuk; H. Löhner; J. Messchendorp; M. Tiemens; BESIII Collaboration

doi:10.1103/PhysRevD.96.012005

Observation of the doubly radiative decay η′ →γγπ0

M. Ablikim, M. N. Achasov, S. Ahmed, X. C. Ai, O. Albayrak, M. Albrecht, D. J. Ambrose, 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/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 language	English
Article number	012005
Number of pages	8
Journal	Physical Review D
Volume	96
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevD.96.012005
Publication status	Published - 26-Jul-2017

Keywords

ANOMALOUS WARD IDENTITIES
AMPLITUDES
CHIRAL PERTURBATION-THEORY

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@article{d40dc8d876e047fc80ba3a2afb30a331,

title = "Observation of the doubly radiative decay η′ →γγπ0",

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.",

keywords = "ANOMALOUS WARD IDENTITIES, AMPLITUDES, CHIRAL PERTURBATION-THEORY",

author = "M. Ablikim and Achasov, {M. N.} and S. Ahmed and Ai, {X. C.} and O. Albayrak and M. Albrecht and Ambrose, {D. J.} and Z. Haddadi and N. Kalantar-Nayestanaki and M. Kavatsyuk and H. L{\"o}hner and J. Messchendorp and M. Tiemens and {BESIII Collaboration}",

year = "2017",

month = jul,

day = "26",

doi = "10.1103/PhysRevD.96.012005",

language = "English",

volume = "96",

journal = "Physical Review D",

issn = "1550-7998",

publisher = "AMER PHYSICAL SOC",

number = "1",

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TY - JOUR

T1 - Observation of the doubly radiative decay η′ →γγπ0

AU - Ablikim, M.

AU - Achasov, M. N.

AU - Ahmed, S.

AU - Ai, X. C.

AU - Albayrak, O.

AU - Albrecht, M.

AU - Ambrose, D. J.

AU - Haddadi, Z.

AU - Kalantar-Nayestanaki, N.

AU - Kavatsyuk, M.

AU - Löhner, H.

AU - Messchendorp, J.

AU - Tiemens, M.

AU - BESIII Collaboration

PY - 2017/7/26

Y1 - 2017/7/26

N2 - 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.

AB - 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.

KW - ANOMALOUS WARD IDENTITIES

KW - AMPLITUDES

KW - CHIRAL PERTURBATION-THEORY

U2 - 10.1103/PhysRevD.96.012005

DO - 10.1103/PhysRevD.96.012005

M3 - Article

SN - 1550-7998

VL - 96

JO - Physical Review D

JF - Physical Review D

IS - 1

M1 - 012005

ER -

Observation of the doubly radiative decay η′ →γγπ0

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