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Observation of J/ψ decays to e+e−e+e− and e+e−μ+μ−
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Using a data sample of 4.481×108 ψ(3686) events collected with the BESIII detector, we report the first observation of the four-lepton-decays J/ψ→e+e−e+e− and J/ψ→e+e−μ+μ− utilizing the process ψ(3686)→π+π−J/ψ. The branching fractions are determined to be [5.48±0.31(stat)±0.45(syst)]×10−5 and [3.53±0.22(stat)±0.13(syst)]×10−5, respectively. The results are consistent with theoretical predictions. No significant signal is observed for J/ψ→μ+μ−μ+μ−, and an upper limit on the branching fraction is set at 1.6×10−6 at the 90% confidence level. A CP asymmetry observable is constructed for the first two channels, which is measured to be (−0.012±0.054±0.010) and (0.062±0.059±0.006), respectively. No evidence for CP violation is observed in this process.
Published by the American Physical Society
2024
American Physical Society (APS)
M. Ablikim
M. N. Achasov
P. Adlarson
S. Ahmed
M. Albrecht
R. Aliberti
A. Amoroso
M. R. An
Q. An
X. H. Bai
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K. Begzsuren
N. Berger
M. Bertani
D. Bettoni
F. Bianchi
J. Bloms
A. Bortone
I. Boyko
R. A. Briere
H. Cai
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A. Calcaterra
G. F. Cao
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Y. L. Fan
J. Fang
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Y. Fang
R. Farinelli
L. Fava
F. Feldbauer
G. Felici
C. Q. Feng
J. H. Feng
M. Fritsch
C. D. Fu
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I. Garzia
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K. Goetzen
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T. Lenz
C. Li
C. H. Li
Cheng Li
D. M. Li
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G. Li
H. Li
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L. K. Li
Lei Li
P. R. Li
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H. Liang
H. Liang
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Y. T. Liang
L. Z. Liao
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C. X. Lin
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C. X. Liu
D. Liu
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H. M. Liu
Huanhuan Liu
Huihui Liu
J. B. Liu
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K. Liu
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M. H. Liu
P. L. Liu
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S. B. Liu
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T. Liu
W. M. Liu
X. Liu
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A. Mangoni
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S. Marcello
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S. Pacetti
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K. Peters
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M. H. Ye
J. H. Yin
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B. X. Yu
C. X. Yu
G. Yu
J. S. Yu
T. Yu
C. Z. Yuan
L. Yuan
X. Q. Yuan
Y. Yuan
Z. Y. Yuan
C. X. Yue
A. Yuncu
A. A. Zafar
Y. Zeng
B. X. Zhang
Guangyi Zhang
H. Zhang
H. H. Zhang
H. H. Zhang
H. Y. Zhang
J. J. Zhang
J. L. Zhang
J. Q. Zhang
J. W. Zhang
J. Y. Zhang
J. Z. Zhang
Jianyu Zhang
Jiawei Zhang
L. Q. Zhang
Lei Zhang
S. Zhang
S. F. Zhang
Shulei Zhang
X. D. Zhang
X. Y. Zhang
Y. Zhang
Y. H. Zhang
Y. T. Zhang
Yan Zhang
Yao Zhang
Yi Zhang
Z. H. Zhang
Z. Y. Zhang
G. Zhao
J. Zhao
J. Y. Zhao
J. Z. Zhao
Lei Zhao
Ling Zhao
M. G. Zhao
Q. Zhao
S. J. Zhao
Y. B. Zhao
Y. X. Zhao
Z. G. Zhao
A. Zhemchugov
B. Zheng
J. P. Zheng
Y. Zheng
Y. H. Zheng
B. Zhong
C. Zhong
L. P. Zhou
Q. Zhou
X. Zhou
X. K. Zhou
X. R. Zhou
A. N. Zhu
J. Zhu
K. Zhu
K. J. Zhu
S. H. Zhu
T. J. Zhu
W. J. Zhu
W. J. Zhu
Y. C. Zhu
Z. A. Zhu
B. S. Zou
J. H. Zou
Title: Observation of
J/ψ
decays to
e+e−e+e−
and
e+e−μ+μ−
Description:
Using a data sample of 4.
481×108 ψ(3686) events collected with the BESIII detector, we report the first observation of the four-lepton-decays J/ψ→e+e−e+e− and J/ψ→e+e−μ+μ− utilizing the process ψ(3686)→π+π−J/ψ.
The branching fractions are determined to be [5.
48±0.
31(stat)±0.
45(syst)]×10−5 and [3.
53±0.
22(stat)±0.
13(syst)]×10−5, respectively.
The results are consistent with theoretical predictions.
No significant signal is observed for J/ψ→μ+μ−μ+μ−, and an upper limit on the branching fraction is set at 1.
6×10−6 at the 90% confidence level.
A CP asymmetry observable is constructed for the first two channels, which is measured to be (−0.
012±0.
054±0.
010) and (0.
062±0.
059±0.
006), respectively.
No evidence for CP violation is observed in this process.
Published by the American Physical Society
2024.
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