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

BES Collaboration

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_μ is 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 Collab.,Nucl.Iust.Meth.,A344（1994）319.[2]T.N.Pham,B.Pire,T.N.Trong,Phys.Lett.,B61（1976）183.[3]Particle Data Group,Phys.Rev.,D50partI（1994）.[4]F.A.Berends et al.,Acta Physica Polonia,B14（1983） 413;F.A.Berends,R.Kleiss,Nucl.Phys.,B177（1981）237.[5]R.Baldini-Cello et al.,Phys. Lett.,58B（1975）471;Min-Zu Wang,Ph.D.Thesis,Univ.Iowa,May 1993.[6]A.Boyarski et al.,Phys.Rev.Lett.,34（1975）1357.[7]D.Coffman et al.,Phys.Rev.Lett.,68（1992）282.[8]BES Collab.,高能物理与核物理，19（1995）673.[9]W.Kwong et al.,Phys.Rev.,D37（1988）3210.[10]H.C.Chiang et al.,Phys.Lett.,B324（1994）482.[11]D.L.Scharre et al.,Phys.Rev.,D23（1981）43.

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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 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_μ is 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.