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Measurement of the ratio of branching fractions B(B_{c}^{+}→J/ψτ^{+}ν_{τ})/B(B_{c}^{+}→J/ψμ^{+}ν_{μ})
Back, J. J..  Physical Review Letters.  v. 120. no. 12.   2018-03-23. .   

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