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Measurement of the branching fraction ratio mathcal{B}(B_c^+ rightarrow psi(2S)π^+)/mathcal{B}(B_c^+ rightarrow J/psi π^+)
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arxiv 1507.03516 v2 pith:NKUVEXMX submitted 2015-07-13 hep-ex
Measurement of the branching fraction ratio mathcal{B}(B_c^+ rightarrow psi(2S)π^+)/mathcal{B}(B_c^+ rightarrow J/psi π^+)
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Using $pp$ collision data collected by LHCb at center-of-mass energies $\sqrt{s}$ = 7 TeV and 8 TeV, corresponding to an integrated luminosity of 3 fb$^{-1}$, the ratio of the branching fraction of the $B_c^+ \rightarrow \psi(2S)\pi^+$ decay relative to that of the $B_c^+ \rightarrow J/\psi\pi^+$ decay is measured to be 0.268 $\pm$ 0.032 (stat) $\pm$ 0.007 (syst) $\pm$ 0.006 (BF). The first uncertainty is statistical, the second is systematic, and the third is due to the uncertainties on the branching fractions of the $J/\psi \rightarrow \mu^+\mu^-$ and $\psi(2S) \rightarrow \mu^+\mu^-$ decays. This measurement is consistent with the previous LHCb result, and the statistical uncertainty is halved.
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Systematic analysis of the transition form factors of $B_c$ to $D$-wave charmonia and corresponding semileptonic decays
hep-ph 2025-10 conditional novelty 6.0
A QCD sum-rule calculation predicts B_c semileptonic branching ratios to D-wave charmonia of order 10^-3 (ψ1), 10^-4 (ψ2 and η_c2), and 10^-5 (ψ3), decreasing with final-state angular momentum.
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