Determination of the J/psi Leptonic Branching Fraction via psi(2S) -> pi^+ pi^- J/psi

Abstract

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 -> e^+e^-) = (5.90 +/- 0.05 +/- 0.10)% and B(J/psi -> mu^+ mu^-) = (5.84 +/- 0.06 +/- 0.10)%, where the first error is statistical and the second is systematic. Assuming lepton universality, the leptonic branching fraction of the J/psi is B(J/psi -> l^+ l^-) = (5.87 +/- 0.04 +/- 0.09)% per species. This result is used to estimate the QCD scale factor Lambda_MSbar and the strong coupling constant alpha_s.

arXiv commentEleven pages with three figures

References in corpus (1)

• Finite size vertex corrections to the three-gluon decay widths of $J/\psi$ and ${\rm Y}$ and a redetermination of ${\alpha }_s(\mu )$ at $\mu =m_c$ and $m_b$

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• Charmonium Decays to Axialvector plus Pseudoscalar Mesons
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• On the Particle Data Group evaluation of Psi' and chi_c Branching Ratios
• Measurement of $\psi (2S)$ decays to baryon pairs
• First Evidence of Lambda Lambda-bar in χ_cJ Decays
• Measurement of the chi_{c2} Polarization in psi(2S) to gamma chi_{c2}
• Study of ${\chi }_{c1}$ and ${\chi }_{c2}$ Meson Production in B Meson Decays
• Study of exclusive two-body B0 meson decays to charmonium
• First Measurement of the Branching Fraction of the Decay psi(2S) --> tau tau
• Measurement of the branching fractions of psi(2S) -> 3(pi+pi-) and J/psi -> 2(pi+pi-)
• Charmonium Decay Physics