Study of η →π+π-l+l-

BESIII Collaboration

doi:10.1103/PhysRevD.111.072008

Study of η →π+π-l+l-

BESIII Collaboration

Instituto de Alta Investigación

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

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Resumen

Using a sample of (10087±44)×106 J/ψ events accumulated with the BESIII detector, we analyze the decays η→π+π-l+l-(l=e or μ) via the process J/ψ→γη. The branching fraction of η→π+π-e+e-is measured to be B(η→π+π-e+e-)=(3.07±0.12stat±0.19syst)×10-4. No signal events are observed for the η→π+π-μ+μ-decay, leading to an upper limit on the branching fraction of B(η→π+π-μ+μ-)<4.0×10-7 at the 90% confidence level. Furthermore, the CP-violation asymmetry parameter is found to be ACP(η→π+π-e+e-)=(-4.04±4.69stat±0.14syst)%, showing no evidence of CP-violation with current statistics. Additionally, we extract the transition form factor from the decay amplitude of η→π+π-e+e-. Finally, axionlike particles are searched for via the decay η→π+π-A,a→e+e-, and upper limits on this branching fraction relative to that of η→π+π-e+e-are presented as a function of the axionlike particle mass in the range 5-200 MeV/c2.

Idioma original	Inglés
Número de artículo	072008
Publicación	Physical Review D
Volumen	111
N.º	7
DOI	https://doi.org/10.1103/PhysRevD.111.072008
Estado	Publicada - 1 abr 2025

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title = "Study of η →π+π-l+l-",

abstract = "Using a sample of (10087±44)×106 J/ψ events accumulated with the BESIII detector, we analyze the decays η→π+π-l+l-(l=e or μ) via the process J/ψ→γη. The branching fraction of η→π+π-e+e-is measured to be B(η→π+π-e+e-)=(3.07±0.12stat±0.19syst)×10-4. No signal events are observed for the η→π+π-μ+μ-decay, leading to an upper limit on the branching fraction of B(η→π+π-μ+μ-)<4.0×10-7 at the 90\% confidence level. Furthermore, the CP-violation asymmetry parameter is found to be ACP(η→π+π-e+e-)=(-4.04±4.69stat±0.14syst)\%, showing no evidence of CP-violation with current statistics. Additionally, we extract the transition form factor from the decay amplitude of η→π+π-e+e-. Finally, axionlike particles are searched for via the decay η→π+π-A,a→e+e-, and upper limits on this branching fraction relative to that of η→π+π-e+e-are presented as a function of the axionlike particle mass in the range 5-200 MeV/c2.",

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

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AU - Achasov, M. N.

AU - Adlarson, P.

AU - Afedulidis, O.

AU - Kabana, S.

AU - The BESIII collaboration

N1 - Publisher Copyright: © 2025 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 - 2025/4/1

Y1 - 2025/4/1

N2 - Using a sample of (10087±44)×106 J/ψ events accumulated with the BESIII detector, we analyze the decays η→π+π-l+l-(l=e or μ) via the process J/ψ→γη. The branching fraction of η→π+π-e+e-is measured to be B(η→π+π-e+e-)=(3.07±0.12stat±0.19syst)×10-4. No signal events are observed for the η→π+π-μ+μ-decay, leading to an upper limit on the branching fraction of B(η→π+π-μ+μ-)<4.0×10-7 at the 90% confidence level. Furthermore, the CP-violation asymmetry parameter is found to be ACP(η→π+π-e+e-)=(-4.04±4.69stat±0.14syst)%, showing no evidence of CP-violation with current statistics. Additionally, we extract the transition form factor from the decay amplitude of η→π+π-e+e-. Finally, axionlike particles are searched for via the decay η→π+π-A,a→e+e-, and upper limits on this branching fraction relative to that of η→π+π-e+e-are presented as a function of the axionlike particle mass in the range 5-200 MeV/c2.

AB - Using a sample of (10087±44)×106 J/ψ events accumulated with the BESIII detector, we analyze the decays η→π+π-l+l-(l=e or μ) via the process J/ψ→γη. The branching fraction of η→π+π-e+e-is measured to be B(η→π+π-e+e-)=(3.07±0.12stat±0.19syst)×10-4. No signal events are observed for the η→π+π-μ+μ-decay, leading to an upper limit on the branching fraction of B(η→π+π-μ+μ-)<4.0×10-7 at the 90% confidence level. Furthermore, the CP-violation asymmetry parameter is found to be ACP(η→π+π-e+e-)=(-4.04±4.69stat±0.14syst)%, showing no evidence of CP-violation with current statistics. Additionally, we extract the transition form factor from the decay amplitude of η→π+π-e+e-. Finally, axionlike particles are searched for via the decay η→π+π-A,a→e+e-, and upper limits on this branching fraction relative to that of η→π+π-e+e-are presented as a function of the axionlike particle mass in the range 5-200 MeV/c2.

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SN - 2470-0010

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ER -

Study of η →π+π-l+l-

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