Determination of Spin-Parity Quantum Numbers for the Narrow Structure near the p Λ  ̄ Threshold in e+e- →pK- Λ  ̄ + c. c.

BESIII Collaboration

doi:10.1103/PhysRevLett.131.151901

Determination of Spin-Parity Quantum Numbers for the Narrow Structure near the p Λ ̄ Threshold in e+e- →pK- Λ ̄ + c. c.

BESIII Collaboration

Instituto de Alta Investigación

CAS - Institute of High Energy Physics
Budker Institute of Nuclear Physics of the Siberian Branch of the RAS
Novosibirsk State University
Uppsala University
Johannes Gutenberg University Mainz
Chinese Academy of Sciences
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
University of Münster
Carnegie Mellon University
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
Zhengzhou 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
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

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Resumen

A narrow structure in the pΛ¯ system near the mass threshold, named as X(2085), is observed in the process e+e-→pK-Λ¯ with a statistical significance greater than 20σ. Its spin and parity are determined for the first time to be JP=1+ in an amplitude analysis, with a statistical significance greater than 5σ over other quantum numbers (0-,1- and 2+). The pole positions of X(2085) are measured to be Mpole=(2084-2+4±9) MeV and Γpole=(58-3+4±25) MeV, where the first uncertainties are statistical and the second ones are systematic. The analysis is based on the study of the process e+e-→pK-Λ¯ and uses the data samples collected with the BESIII detector at the center-of-mass energies s=4.008, 4.178, 4.226, 4.258, 4.416, and 4.682 GeV with a total integrated luminosity of 8.35 fb-1.

Idioma original	Inglés
Número de artículo	151901
Publicación	Physical Review Letters
Volumen	131
N.º	15
DOI	https://doi.org/10.1103/PhysRevLett.131.151901
Estado	Publicada - 13 oct 2023

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title = "Determination of Spin-Parity Quantum Numbers for the Narrow Structure near the p Λ{\= } Threshold in e+e- →pK- Λ{\= } + c. c.",

abstract = "A narrow structure in the pΛ¯ system near the mass threshold, named as X(2085), is observed in the process e+e-→pK-Λ¯ with a statistical significance greater than 20σ. Its spin and parity are determined for the first time to be JP=1+ in an amplitude analysis, with a statistical significance greater than 5σ over other quantum numbers (0-,1- and 2+). The pole positions of X(2085) are measured to be Mpole=(2084-2+4±9) MeV and Γpole=(58-3+4±25) MeV, where the first uncertainties are statistical and the second ones are systematic. The analysis is based on the study of the process e+e-→pK-Λ¯ and uses the data samples collected with the BESIII detector at the center-of-mass energies s=4.008, 4.178, 4.226, 4.258, 4.416, and 4.682 GeV with a total integrated luminosity of 8.35 fb-1.",

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

note = "Publisher Copyright: {\textcopyright} 2023 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 = "2023",

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T1 - Determination of Spin-Parity Quantum Numbers for the Narrow Structure near the p Λ ̄ Threshold in e+e- →pK- Λ ̄ + c. c.

AU - Ablikim, M.

AU - Achasov, M. N.

AU - Adlarson, P.

AU - Aliberti, R.

AU - Kabana, S.

AU - The BESIII collaboration

N1 - Publisher Copyright: © 2023 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 - 2023/10/13

Y1 - 2023/10/13

N2 - A narrow structure in the pΛ¯ system near the mass threshold, named as X(2085), is observed in the process e+e-→pK-Λ¯ with a statistical significance greater than 20σ. Its spin and parity are determined for the first time to be JP=1+ in an amplitude analysis, with a statistical significance greater than 5σ over other quantum numbers (0-,1- and 2+). The pole positions of X(2085) are measured to be Mpole=(2084-2+4±9) MeV and Γpole=(58-3+4±25) MeV, where the first uncertainties are statistical and the second ones are systematic. The analysis is based on the study of the process e+e-→pK-Λ¯ and uses the data samples collected with the BESIII detector at the center-of-mass energies s=4.008, 4.178, 4.226, 4.258, 4.416, and 4.682 GeV with a total integrated luminosity of 8.35 fb-1.

AB - A narrow structure in the pΛ¯ system near the mass threshold, named as X(2085), is observed in the process e+e-→pK-Λ¯ with a statistical significance greater than 20σ. Its spin and parity are determined for the first time to be JP=1+ in an amplitude analysis, with a statistical significance greater than 5σ over other quantum numbers (0-,1- and 2+). The pole positions of X(2085) are measured to be Mpole=(2084-2+4±9) MeV and Γpole=(58-3+4±25) MeV, where the first uncertainties are statistical and the second ones are systematic. The analysis is based on the study of the process e+e-→pK-Λ¯ and uses the data samples collected with the BESIII detector at the center-of-mass energies s=4.008, 4.178, 4.226, 4.258, 4.416, and 4.682 GeV with a total integrated luminosity of 8.35 fb-1.

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DO - 10.1103/PhysRevLett.131.151901

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AN - SCOPUS:85175271917

SN - 0031-9007

VL - 131

JO - Physical Review Letters

JF - Physical Review Letters

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Determination of Spin-Parity Quantum Numbers for the Narrow Structure near the p Λ ̄ Threshold in e+e- →pK- Λ ̄ + c. c.

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