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Measurement of the leptonic decay width of J/ψ using initial state radiation

Journal article published in 2016 by M. Ablikim, W. Bennett D., A. Briere R., F. Cao G., F. Demori, J. P. Liu, J. F. Chang, Lei Li, G. Chelkov, G. Chen, H. S. Chen, J. Y. Liu, H. Y. Chen, J. C. Chen, M. N. Achasov and other authors.
This paper is available in a repository.
This paper is available in a repository.

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Abstract

Using a data set of 2.93 fb$^{-1}$ taken at a center-of-mass energy of $\sqrt{s}$ = 3.773 GeV with the BESIII detector at the BEPCII collider, we measure the process $e^+e^-→ J/ψγ→ μ^+μ^-γ$ and determine the product of the branching fraction and the electronic width $\mathcal B_{μμ}⋅ Γ_{ee} = (333.4 ± 2.5_{\rm stat} ± 4.4_{\rm sys})$~eV. Using the earlier-published BESIII result for $\mathcal B_{μμ}$ = (5.973 $±$ 0.007$_{\rm stat}$ $±$ 0.037$_{\rm sys}$)\%, we derive the $J/ψ$ electronic width $Γ_{ee}$~= (5.58 $±$ 0.05$_{\rm stat}$ $±$ 0.08$_{\rm sys}$) keV.