Chinese Physics C > 1996, Vol. 20 > Issue(2): 97-106

Determination of J/ψ Leptonic Branching Fraction Via ψ(2S)→π⁺π^－J/ψ

BES Collaboration

Institute of High Energy Physics,The Chinese Academy of Sciences,Beijing 100039

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Abstract：
Two processes ψ(2S)→π ⁺π ^－J/ψ,J/ψ→1 ⁺1 ^－and J/ψ→anything are carefully studied to get the J/ψ leptonic branching fractions with the ψ(2S)data at BES/BEPC.The results are B(J/ψ→e ⁺e ^－)=(5.90±0.07±0.16)% and B(J/ψ→μ ⁺μ ^－)=(5.96 ±0.08±0.16)%,and B _e/ B _μis estimated to be 0.990±0.018±0.024.Assuming B _e= B _μ,the leptonic branching fraction of the J/ψ is B(J/ψ→1 ⁺1 ^－)=(5.93±0.05 ± 0. 16 )%.This result is used to estimate the QCD scale factor ∧(nf/MS) and the strong coupling constant α _s.

References

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BES Collaboration. Determination of J/ψ Leptonic Branching Fraction Via ψ(2S)→π ⁺π ^－J/ψ[J]. Chinese Physics C, 1996, 20(2): 97-106.

BES Collaboration. Determination of J/ψ Leptonic Branching Fraction Via ψ(2S)→π ⁺π ^－J/ψ[J]. Chinese Physics C, 1996, 20(2): 97-106. shu

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Received: 1900-01-01
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Determination of J/ψ Leptonic Branching Fraction Via ψ(2S)→π⁺π^－J/ψ

BES Collaboration

Institute of High Energy Physics,The Chinese Academy of Sciences,Beijing 100039

Received Date:1900-01-01
Accepted Date:1900-01-01
Available Online:1996-02-05

Abstract:Two processes ψ(2S)→π⁺π^－J/ψ,J/ψ→1⁺1^－and J/ψ→anything are carefully studied to get the J/ψ leptonic branching fractions with the ψ(2S)data at BES/BEPC.The results areB(J/ψ→e⁺e^－)=(5.90±0.07±0.16)% andB(J/ψ→μ⁺μ^－)=(5.96 ±0.08±0.16)%,andB_e/B_μis estimated to be 0.990±0.018±0.024.AssumingB_e=B_μ,the leptonic branching fraction of the J/ψ isB(J/ψ→1⁺1^－)=(5.93±0.05 ± 0. 16 )%.This result is used to estimate the QCD scale factor ∧(nf/MS) and the strong coupling constantα_s.