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

Journal Article · · Physical Review. D.
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Using a data sample of 4.481 × 10 8 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 C P 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 C P violation is observed in this process.

Published by the American Physical Society 2024
Research Organization:
Indiana Univ., Bloomington, IN (United States); Univ. of Minnesota, Minneapolis, MN (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC)
Grant/Contract Number:
FG02-05ER41374; SC0012069
OSTI ID:
2324691
Alternate ID(s):
OSTI ID: 2579370
Journal Information:
Physical Review. D., Journal Name: Physical Review. D. Journal Issue: 5 Vol. 109; ISSN PRVDAQ; ISSN 2470-0010
Publisher:
American Physical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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