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Measurement of the ratio of the leptonic widths \(\Gamma_{ee}/\Gamma_{\mu\mu}\) for the \(J/\psi\) meson
KEDR Collaboration; Aulchenko, V M; Baldin, E M; Barladyan, A K; A Yu Barnyakov; et al. arXiv.org, Feb 17, 2014.You might have access to this document
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