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$R(J/\psi)$ and $B_c^- \rightarrow J/\psi \ell^-\bar{\nu}_\ell$ Lepton Flavor Universality Violating Observables from Lattice QCD
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abstract
We use our lattice QCD computation of the $B_c\rightarrow J/\psi$ form factors to determine the differential decay rate for the semitauonic decay channel and construct the ratio of branching fractions $R(J/\psi) = \mathcal{B}(B_c^- \rightarrow J/\psi \tau^-\bar{\nu}_\tau)/\mathcal{B}(B_c^- \rightarrow J/\psi \mu^-\bar{\nu}_\mu)$. We find $R(J/\psi) = 0.2582(38)$ and give an error budget. We also extend the relevant angular observables, which were recently suggested for the study of lepton flavor universality violating effects in $B\rightarrow D^*\ell\nu$, to $B_c \rightarrow J/\psi\ell\nu$ and make predictions for their values under different new physics scenarios.
Forward citations
Cited by 3 Pith papers
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Heavy-light meson decay constants and hyperfine splittings with the heavy-HISQ method
A heavy-HISQ lattice QCD calculation yields vector, tensor, and pseudoscalar decay-constant ratios and hyperfine splittings for D(s) and B(s) mesons, including first lattice results for B*_(s) tensor decay constants.
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Probing the $\Lambda_{b}\to \Lambda_{c}^{*}\tau \bar{\nu}_{\tau}$ decays with leptoquarks
In the U1 and S1 leptoquark models, the ratio R_Λ_c* for Λ_b -> Λ_c*(2595,2625) τ ν̄_τ decays deviates from the Standard Model prediction, making it a promising probe of new physics.
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Unravelling theoretical challenges in understanding $B_c$ meson decay
The paper presents new RIQ-model predictions for B_c decay ratios (R_D/D*, R_eta_c/J/psi, and tau/mu leptonic ratios) with no derivation or error bars.
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