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

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Observation of J/ψ decays to e+e−e+e− and e+e−μ+μ−. / BESIII Collaboration ; Николаев, Иван Борисович ; Мучной, Николай Юрьевич.

In: Physical Review D, Vol. 109, No. 5, 052006, 18.03.2024.

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

BibTeX

@article{12cb6f831711452c99b550ac1de6e5e9,

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 M. n. Achasov and P. Adlarson and S. Ahmed and M. Albrecht and R. Aliberti and A. Amoroso and M. r. An and Q. An and X. h. Bai 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 R. a. Briere and H. Cai and X. Cai and A. Calcaterra and G. f. Cao and N. Cao and S. a. Cetin and J. f. Chang and W. l. Chang and G. Chelkov and D. y. Chen and H. s. Chen and Николаев, {Иван Борисович} and Мучной, {Николай Юрьевич}",

year = "2024",

month = mar,

day = "18",

doi = "10.1103/PhysRevD.109.052006",

language = "English",

volume = "109",

journal = "Physical Review D",

issn = "2470-0010",

publisher = "American Physical Society",

number = "5",

}

RIS

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 - 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, H. s.

AU - Николаев, Иван Борисович

AU - Мучной, Николай Юрьевич

PY - 2024/3/18

Y1 - 2024/3/18

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/record/display.uri?eid=2-s2.0-85188159640&origin=inward&txGid=365b1fe8d97c6cf47698853d7a79f294

U2 - 10.1103/PhysRevD.109.052006

DO - 10.1103/PhysRevD.109.052006

M3 - Article

VL - 109

JO - Physical Review D

JF - Physical Review D

SN - 2470-0010

IS - 5

M1 - 052006

ER -

ID: 62717348