Measurement of ${\Gamma }_{ee}(J/\psi )$ with KEDR detector

Abstract

The product of the electronic width of the $J/\psi$ meson and the branching fractions of its decay to hadrons and electrons has been measured using the KEDR detector at the VEPP-4M $e^{+}{e}^{-}$ collider. The obtained values are: ${\Gamma }_{ee}(J/\psi )=5.550\pm 0.056\pm 0.089\text{keV},$ ${\Gamma }_{ee}(J/\psi )\cdot {\mathcal{B}}_{\text{hadrons}}(J/\psi )=4.884\pm 0.048\pm 0.078\text{keV},$ ${\Gamma }_{ee}(J/\psi )\cdot {\mathcal{B}}_{ee}(J/\psi )=0.3331\pm 0.0066\pm 0.0040\text{keV}.$ The uncertainties shown are statistical and systematic, respectively. Using the result presented and the world-average value of the electronic branching fraction, one obtains the total width of the $J/\psi$ meson: $\Gamma =92.94\pm 1.83\text{keV}.$ These results are consistent with the previous experiments.

arXiv comment19 pages, 13 figures

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