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First Measurement of the Branching Fraction of the Decay psi(2S) --> tau tau
J. Z. Bai
The branching fraction of the psi(2S) decay into tau pair has been measured for the first time using the BES detector at the Beijing Electron-Positron Collider. The result is $B_{τ…
Measurement of the Total Cross Section for Hadronic Production by e+e- Annihilation at Energies between 2.6-5 Gev
J. Z. Bai
Using the upgraded Beijing Spectrometer (BESII), we have measured the total cross section for annihilation into hadronic final states at center-of-mass energies of 2.6, 3.…
On recent data of branching ratios for psi(2S)-->J/psi pi pi and psi(2S)-->J/psi eta
Y. F. Gu, X. H. Li
Recent data on branching ratios for ψ(2S) decays to J/ψπ^+π^-, J/ψπ^0π^0 and J/ψηare reviewed. An alternative treatment of data is proposed to get rid of the logical inconsistency…
Study of the Hadronic Decays of χ_c States
J. Z. Bai
Hadronic decays of the P-wave spin-triplet charmonium states χ_cJ (J=0,1,2) are studied using a sample of ψ(2S) decays collected by the BES detector operating at the BEPC storage r…
Determination of the J/psi Leptonic Branching Fraction via psi(2S) -> pi^+ pi^- J/psi
J. Z. Bai
A comparison of the rates for psi(2S) -> pi^+ pi^- J/psi, J/psi -> l^+l^- and J/psi -> anything is used to determine the J/psi leptonic branching fractions. The results are B(J/psi…
Branching Fractions for and
J. Z. Bai
We report the first measurements of the branching fractions: and . The $…