Observation of the Anomalous Shape of X (1840) in J/ψ →γ3 (π+π-) Indicating a Second Resonance Near p p ¯ Threshold

The BESIII collaboration

doi:10.1103/PhysRevLett.132.151901

Observation of the Anomalous Shape of X (1840) in J/ψ →γ3 (π+π-) Indicating a Second Resonance Near p p ¯ Threshold

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
North China Electric Power 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
Qufu Normal University
Beijing Institute of Petrochemical Technology
Lanzhou University
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
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

17 Scopus citations

Abstract

Using a sample of (10087±44)×106 J/ψ events, which is about 45 times larger than that was previously analyzed, a further investigation on the J/ψ→γ3(π+π-) decay is performed. A significant distortion at 1.84 GeV/c2 in the line shape of the 3(π+π-) invariant mass spectrum is observed for the first time, which could be resolved by two overlapping resonant structures, X(1840) and X(1880). The new state X(1880) is observed with a statistical significance larger than 10σ. The mass and width of X(1880) are determined to be 1882.1±1.7±0.7 MeV/c2 and 30.7±5.5±2.4 MeV, respectively, which indicates the existence of a pp¯ bound state.

Original language	English
Article number	151901
Journal	Physical Review Letters
Volume	132
Issue number	15
DOIs	https://doi.org/10.1103/PhysRevLett.132.151901
State	Published - 12 Apr 2024

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10.1103/PhysRevLett.132.151901

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@article{2570bf6432fe444a8ba23c18980248e1,

title = "Observation of the Anomalous Shape of X (1840) in J/ψ →γ3 (π+π-) Indicating a Second Resonance Near p p ¯ Threshold",

abstract = "Using a sample of (10087±44)×106 J/ψ events, which is about 45 times larger than that was previously analyzed, a further investigation on the J/ψ→γ3(π+π-) decay is performed. A significant distortion at 1.84 GeV/c2 in the line shape of the 3(π+π-) invariant mass spectrum is observed for the first time, which could be resolved by two overlapping resonant structures, X(1840) and X(1880). The new state X(1880) is observed with a statistical significance larger than 10σ. The mass and width of X(1880) are determined to be 1882.1±1.7±0.7 MeV/c2 and 30.7±5.5±2.4 MeV, respectively, which indicates the existence of a pp¯ bound state.",

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.",

year = "2024",

month = apr,

day = "12",

doi = "10.1103/PhysRevLett.132.151901",

language = "English",

volume = "132",

journal = "Physical Review Letters",

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T1 - Observation of the Anomalous Shape of X (1840) in J/ψ →γ3 (π+π-) Indicating a Second Resonance Near p p ¯ Threshold

AU - Ablikim, M.

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 - 2024/4/12

Y1 - 2024/4/12

N2 - Using a sample of (10087±44)×106 J/ψ events, which is about 45 times larger than that was previously analyzed, a further investigation on the J/ψ→γ3(π+π-) decay is performed. A significant distortion at 1.84 GeV/c2 in the line shape of the 3(π+π-) invariant mass spectrum is observed for the first time, which could be resolved by two overlapping resonant structures, X(1840) and X(1880). The new state X(1880) is observed with a statistical significance larger than 10σ. The mass and width of X(1880) are determined to be 1882.1±1.7±0.7 MeV/c2 and 30.7±5.5±2.4 MeV, respectively, which indicates the existence of a pp¯ bound state.

AB - Using a sample of (10087±44)×106 J/ψ events, which is about 45 times larger than that was previously analyzed, a further investigation on the J/ψ→γ3(π+π-) decay is performed. A significant distortion at 1.84 GeV/c2 in the line shape of the 3(π+π-) invariant mass spectrum is observed for the first time, which could be resolved by two overlapping resonant structures, X(1840) and X(1880). The new state X(1880) is observed with a statistical significance larger than 10σ. The mass and width of X(1880) are determined to be 1882.1±1.7±0.7 MeV/c2 and 30.7±5.5±2.4 MeV, respectively, which indicates the existence of a pp¯ bound state.

UR - https://www.scopus.com/pages/publications/85190064772

U2 - 10.1103/PhysRevLett.132.151901

DO - 10.1103/PhysRevLett.132.151901

M3 - Article

C2 - 38682972

AN - SCOPUS:85190064772

SN - 0031-9007

VL - 132

JO - Physical Review Letters

JF - Physical Review Letters

IS - 15

M1 - 151901

ER -

Observation of the Anomalous Shape of X (1840) in J/ψ →γ3 (π+π-) Indicating a Second Resonance Near p p ¯ Threshold

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