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Test of lepton flavour universality using $B^0 \to D^{*-}\tau^+\nu_{\tau}$ decays with hadronic $\tau$ channels / LHCb Collaboration
The branching fraction $\mathcal{B}(B^0 \to D^{*-}\tau^+\nu_\tau)$ is measured relative to that of the normalisation mode $B^0 \to D^{*-}\pi^+\pi^-\pi^+$ using hadronic $\tau^+ \to \pi^+\pi^-\pi^+(\pi^0)\bar{\nu}_\tau$ decays in proton-proton collision data at a centre-of-mass energy of 13 TeV collected by the LHCb experiment, corresponding to an integrated luminosity of 2 fb$^{-1}$. The measured ratio is $\mathcal{B}(B^0 \to D^{*-}\tau^+\nu_\tau)/\mathcal{B}(B^0 \to D^{*-}\pi^+\pi^-\pi^+)= 1.79 \pm 0.11 \pm 0.11$, where the first uncertainty is statistical and the second is related to systematic effects. [...]
arXiv:2305.01463; LHCb-PAPER-2022-052; CERN-EP-2023-062.- Geneva : CERN, 2023-07-01 - 18 p. - Published in : Phys. Rev. D Fulltext: LHCb-PAPER-2022-052 - PDF; 2305.01463 - PDF; Publication - PDF; Related data file(s): ZIP;

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Observation of the $B^+ \rightarrow J/\psi \eta^{\prime} K^+$ decay / LHCb Collaboration
The $B^+ \rightarrow J/\psi \eta^{\prime} K^+$ decay is observed for the first time using proton-proton collision data collected by the LHCb experiment at centre-of-mass energies of 7, 8, and 13TeV, corresponding to a total integrated luminosity of 9fb$^{-1}$. The branching fraction of this decay is measured relative to the known branching fraction of the $B^+ \rightarrow \psi(2S) K^+$ decays and found to be $$ \frac{\mathcal{B}( B^+ \rightarrow J/\psi \eta^{\prime}K^+)} {\mathcal{B}( B^+ \rightarrow \psi(2S)K^+) } = \left(4.91\pm 0.47\pm0.29\pm0.07\right)\times10^{-2}, $$ where the first uncertainty is statistical, the second is systematic and the third is related to external branching fractions. [...]
arXiv:2303.09443; LHCb-PAPER-2022-054; CERN-EP-2023-022.- Geneva : CERN, 2023-08-25 - 19 p. Fulltext: LHCb-PAPER-2022-054 - PDF; 2303.09443 - PDF; Publication - PDF; Erratum - PDF; Related data file(s): ZIP;

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