Observation of the decay J/ψ →e+e-η (1405) with η (1405) →π0f0 (980)

The BESIII collaboration

doi:10.1103/PhysRevD.109.012007

Observation of the decay J/ψ →e+e-η (1405) with η (1405) →π0f0 (980)

The BESIII collaboration

Institute of Higher Research

CAS - Institute of High Energy Physics
Budker Institute of Nuclear Physics of the Siberian Branch of the RAS
Novosibirsk State University
Uppsala University
Zhengzhou University
Chinese Academy of Sciences
Johannes Gutenberg University Mainz
University of Turin
National Institute for Nuclear Physics
Liaoning Normal University
University of Science and Technology of China
Southeast University, Nanjing
Joint Institute for Nuclear Research
Peking University
National Centre for Nuclear Research
Mongolian Academy of Sciences
Carnegie Mellon University
University of Münster
Wuhan University
University of Chinese Academy of Sciences
Istinye University
Xinyang Normal University
Nankai University
Moscow Institute of Physics and Technology
Soochow University
Nanjing University
Tsinghua University
CAS - Institute of Modern Physics
Jilin University
Hunan University
Chung-Ang University
Ruhr University Bochum
Shandong University
Yunnan University
Helmholtz Institute Mainz
University of Jinan
Liaoning University
University of Eastern Piedmont
Sun Yat-Sen University
University of Oxford
University of Ferrara
University of Manchester
GSI Helmholtz Centre for Heavy Ion Research
Guangxi University
Henan University of Technology
Nanjing Normal University
Shandong Normal University
Fudan University
Henan Normal University
University of Hawai'i at Mānoa
Suranaree University of Technology
South China Normal University
University of the Punjab
Indiana University Bloomington
Hangzhou Normal University
Huangshan College
University of Groningen
China University of Geosciences, Wuhan
Justus Liebig University Giessen
Indian Institute of Technology Madras
Lanzhou University
Qufu Normal University
Beijing Institute of Petrochemical Technology
Sichuan University
Guangxi Normal University
Shanxi University
Central China Normal University
Henan University of Science and Technology
University of South China
Central South University
Zhejiang University
Goethe University Frankfurt
COMSATS University Islamabad
IBA
University of Perugia
Universidad de Tarapacá
Petersburg Nuclear Physics Institute (PNPI)
Hunan Normal University
Shanxi Normal University
Near East University
North China Electric Power University
Hebei University
University of Science and Technology Liaoning
Inner Mongolia University
Yantai University
Shanghai Jiao Tong University
Ministry of Education of the People's Republic of China
China Center of Advanced Science and Technology World Laboratory
Beihang University
Henan University

Research output: Contribution to journal › Article › peer-review

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Abstract

Using a data sample of (10087±44)×106 J/ψ events collected by the BESIII detector in 2009, 2012, 2018 and 2019, the electromagnetic Dalitz process J/ψ→e+e-η(1405) is observed via the decay η(1405)→π0f0(980), f0(980)→π+π-, with a significance of about 9.8σ. The branching fraction of this decay is measured to be B(J/ψ→e+e-η(1405)→e+e-π0f0(980)→e+e-π0π+π-)=(2.04±0.20(stat)±0.08(syst))×10-7. The branching fraction ratio B(J/ψ→e+e-η(1405))/B(J/ψ→γη(1405)) is determined to be (1.36±0.17(stat)±0.06(syst))×10-2. Furthermore, an e+e- invariant mass dependent transition form factor of J/ψ→e+e-η(1405) is presented for the first time. The obtained result provides input for different theoretical models and is valuable for the improved understanding the intrinsic structure of the η(1405) meson.

Original language	English
Article number	012007
Journal	Physical Review D
Volume	109
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevD.109.012007
State	Published - 1 Jan 2024

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10.1103/PhysRevD.109.012007

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title = "Observation of the decay J/ψ →e+e-η (1405) with η (1405) →π0f0 (980)",

abstract = "Using a data sample of (10087±44){\texttimes}106 J/ψ events collected by the BESIII detector in 2009, 2012, 2018 and 2019, the electromagnetic Dalitz process J/ψ→e+e-η(1405) is observed via the decay η(1405)→π0f0(980), f0(980)→π+π-, with a significance of about 9.8σ. The branching fraction of this decay is measured to be B(J/ψ→e+e-η(1405)→e+e-π0f0(980)→e+e-π0π+π-)=(2.04±0.20(stat)±0.08(syst)){\texttimes}10-7. The branching fraction ratio B(J/ψ→e+e-η(1405))/B(J/ψ→γη(1405)) is determined to be (1.36±0.17(stat)±0.06(syst)){\texttimes}10-2. Furthermore, an e+e- invariant mass dependent transition form factor of J/ψ→e+e-η(1405) is presented for the first time. The obtained result provides input for different theoretical models and is valuable for the improved understanding the intrinsic structure of the η(1405) meson.",

author = "M. Ablikim and Achasov, \{M. N.\} and P. Adlarson and Ai, \{X. C.\} and S. Kabana and \{The BESIII collaboration\}",

note = "Publisher Copyright: {\textcopyright} 2024 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the {"}https://creativecommons.org/licenses/by/4.0/{"}Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP3.",

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AU - Achasov, M. N.

AU - Adlarson, P.

AU - Ai, X. C.

AU - Kabana, S.

AU - The BESIII collaboration

N1 - Publisher Copyright: © 2024 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP3.

PY - 2024/1/1

Y1 - 2024/1/1

N2 - Using a data sample of (10087±44)×106 J/ψ events collected by the BESIII detector in 2009, 2012, 2018 and 2019, the electromagnetic Dalitz process J/ψ→e+e-η(1405) is observed via the decay η(1405)→π0f0(980), f0(980)→π+π-, with a significance of about 9.8σ. The branching fraction of this decay is measured to be B(J/ψ→e+e-η(1405)→e+e-π0f0(980)→e+e-π0π+π-)=(2.04±0.20(stat)±0.08(syst))×10-7. The branching fraction ratio B(J/ψ→e+e-η(1405))/B(J/ψ→γη(1405)) is determined to be (1.36±0.17(stat)±0.06(syst))×10-2. Furthermore, an e+e- invariant mass dependent transition form factor of J/ψ→e+e-η(1405) is presented for the first time. The obtained result provides input for different theoretical models and is valuable for the improved understanding the intrinsic structure of the η(1405) meson.

AB - Using a data sample of (10087±44)×106 J/ψ events collected by the BESIII detector in 2009, 2012, 2018 and 2019, the electromagnetic Dalitz process J/ψ→e+e-η(1405) is observed via the decay η(1405)→π0f0(980), f0(980)→π+π-, with a significance of about 9.8σ. The branching fraction of this decay is measured to be B(J/ψ→e+e-η(1405)→e+e-π0f0(980)→e+e-π0π+π-)=(2.04±0.20(stat)±0.08(syst))×10-7. The branching fraction ratio B(J/ψ→e+e-η(1405))/B(J/ψ→γη(1405)) is determined to be (1.36±0.17(stat)±0.06(syst))×10-2. Furthermore, an e+e- invariant mass dependent transition form factor of J/ψ→e+e-η(1405) is presented for the first time. The obtained result provides input for different theoretical models and is valuable for the improved understanding the intrinsic structure of the η(1405) meson.

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JF - Physical Review D

IS - 1

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ER -

Observation of the decay J/ψ →e+e-η (1405) with η (1405) →π0f0 (980)

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