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

  • Two processes ψ(2S)→π+πJ/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 Be/Bμ is estimated to be 0.990±0.018±0.024.Assuming Be=Bμ,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 αs.
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  • [1] 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+πJ/ψ[J]. Chinese Physics C, 1996, 20(2): 97-106.
BES Collaboration. Determination of J/ψ Leptonic Branching Fraction Via ψ(2S)→π+πJ/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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Determination of J/ψ Leptonic Branching Fraction Via ψ(2S)→π+πJ/ψ

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

Abstract: Two processes ψ(2S)→π+πJ/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 Be/Bμ is estimated to be 0.990±0.018±0.024.Assuming Be=Bμ,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 αs.

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