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- W4283731926 abstract "Using $e^+e^-$ annihilation data sets collected with the BESIII detector, we measure the cross sections of the processes $e^+e^- to e^+e^-$ and $e^+e^- to mu^+mu^-$ at fifteen center-of-mass energy points in the vicinity of the $J/psi$ resonance. By a simultaneous fit to the measured, center-of-mass energy dependent cross sections of the two processes, the combined quantities $Gamma_{ee} Gamma_{ee} / Gamma_{rm tot}$ and $Gamma_{ee} Gamma_{mumu} / Gamma_{rm tot}$ are determined to be ($0.346 pm 0.009$) and ($0.335 pm 0.006$) keV, respectively, where $Gamma_{ee}$, $Gamma_{mumu}$, and $Gamma_{rm tot}$ are the electronic, muonic, and total decay widths of the $J/psi$ resonance, respectively. Using the resultant $Gamma_{ee} Gamma_{mumu} / Gamma_{rm tot}$ and $Gamma_{ee} Gamma_{ee} / Gamma_{rm tot}$, the ratio $Gamma_{ee} / Gamma_{mumu}$ is calculated to be $1.031 pm 0.015$, which is consistent with the expectation of lepton universality within about two standard deviations. Assuming lepton universality and using the branching fraction of the $J/psi$ leptonic decay measured by BESIII in 2013, $Gamma_{rm tot}$ and $Gamma_{ll}$ are determined to be ($93.0 pm 2.1$) and ($5.56 pm 0.11$) keV, respectively, where $Gamma_{ll}$ is the average leptonic decay width of the $J/psi$ resonance." @default.
- W4283731926 created "2022-07-01" @default.
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