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Comment on Implications of new physics in the decays B_c to (J/psi,η_c)τν
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✦ hep-lat
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decayselementmatrixmesonarxivccqmcommentconfining
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As part of a study BSM corrections to leptonic decays of the $B_c$ meson, Tran et al. (arXiv:1801.06927) use the covariant confining quark model (CCQM) to estimate the matrix element of the pseudo-scalar curent between the vacuum and the $B_c$ meson. We note that this matrix element can be determined using existing lattice QCD results.
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