Observation of J/ψ decays to e+e-e+e- and e+e-μ+μ-

(BESIII Collaboration)

doi:10.1103/PhysRevD.109.052006

Observation of J/ψ decays to e+e-e+e- and e+e-μ+μ-

(BESIII Collaboration)

Physics and Astronomy (Twin Cities)

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

4 Scopus citations

Abstract

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.

Original language	English (US)
Article number	052006
Journal	Physical Review D
Volume	109
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevD.109.052006
State	Published - Mar 1 2024

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© 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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@article{de85947b21db4788a6de624bd33dd7df,

title = "Observation of J/ψ decays to e+e-e+e- and e+e-μ+μ-",

abstract = "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.",

author = "\{(BESIII Collaboration)\} and M. Ablikim and Achasov, \{M. N.\} and P. Adlarson and S. Ahmed and M. Albrecht and R. Aliberti and A. Amoroso and An, \{M. R.\} and Q. An and Bai, \{X. H.\} and Y. Bai and O. Bakina and Ferroli, \{R. Baldini\} and I. Balossino and Y. Ban and K. Begzsuren and N. Berger and M. Bertani and D. Bettoni and F. Bianchi and J. Bloms and A. Bortone and I. Boyko and Briere, \{R. A.\} and H. Cai and X. Cai and A. Calcaterra and Cao, \{G. F.\} and N. Cao and Cetin, \{S. A.\} and Chang, \{J. F.\} and Chang, \{W. L.\} and G. Chelkov and Chen, \{D. Y.\} and G. Chen and Chen, \{H. S.\} and Chen, \{M. L.\} and Chen, \{S. J.\} and Chen, \{X. R.\} and Chen, \{Y. B.\} and Chen, \{Z. J.\} and Cheng, \{W. S.\} and G. Cibinetto and F. Cossio and Cui, \{X. F.\} and Dai, \{H. L.\} and Dai, \{J. P.\} and Dai, \{X. C.\} and H. Muramatsu and R. Poling",

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 = mar,

day = "1",

doi = "10.1103/PhysRevD.109.052006",

language = "English (US)",

volume = "109",

journal = "Physical Review D",

issn = "2470-0010",

publisher = "American Physical Society",

number = "5",

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TY - JOUR

T1 - Observation of J/ψ decays to e+e-e+e- and e+e-μ+μ-

AU - (BESIII Collaboration)

AU - Ablikim, M.

AU - Achasov, M. N.

AU - Adlarson, P.

AU - Ahmed, S.

AU - Albrecht, M.

AU - Aliberti, R.

AU - Amoroso, A.

AU - An, M. R.

AU - An, Q.

AU - Bai, X. H.

AU - Bai, Y.

AU - Bakina, O.

AU - Ferroli, R. Baldini

AU - Balossino, I.

AU - Ban, Y.

AU - Begzsuren, K.

AU - Berger, N.

AU - Bertani, M.

AU - Bettoni, D.

AU - Bianchi, F.

AU - Bloms, J.

AU - Bortone, A.

AU - Boyko, I.

AU - Briere, R. A.

AU - Cai, H.

AU - Cai, X.

AU - Calcaterra, A.

AU - Cao, G. F.

AU - Cao, N.

AU - Cetin, S. A.

AU - Chang, J. F.

AU - Chang, W. L.

AU - Chelkov, G.

AU - Chen, D. Y.

AU - Chen, G.

AU - Chen, H. S.

AU - Chen, M. L.

AU - Chen, S. J.

AU - Chen, X. R.

AU - Chen, Y. B.

AU - Chen, Z. J.

AU - Cheng, W. S.

AU - Cibinetto, G.

AU - Cossio, F.

AU - Cui, X. F.

AU - Dai, H. L.

AU - Dai, J. P.

AU - Dai, X. C.

AU - Muramatsu, H.

AU - Poling, R.

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 - 2024/3/1

Y1 - 2024/3/1

N2 - 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.

AB - 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.

UR - https://www.scopus.com/pages/publications/85188159640

UR - https://www.scopus.com/pages/publications/85188159640#tab=citedBy

U2 - 10.1103/PhysRevD.109.052006

DO - 10.1103/PhysRevD.109.052006

M3 - Article

AN - SCOPUS:85188159640

SN - 2470-0010

VL - 109

JO - Physical Review D

JF - Physical Review D

IS - 5

M1 - 052006

ER -

Observation of J/ψ decays to e+e-e+e- and e+e-μ+μ-

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