Study of η ′ → π + π − l + l − decays at BESIII
With a sample of (10087 ± 44) × 106J/ψ events accumulated with the BESIII detector, we analyze the decays η′ → π+π−l+l−(l = e, μ) via the process J/ψ → γη′. The branching fractions are measured to be B(η′ → π+π−e+e−) = (2.45 ± 0.02(stat.) ± 0.08(syst.)) × 10−3 and B(η′ → π+π−μ+μ−) = (2.16 ± 0.12(sta...
Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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Format: | Journal article |
Sprog: | English |
Udgivet: |
Springer
2024
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