The decays $B_c\to J/\psi +\bar{\ell }{\nu }_{\ell }$ and $B_c\to J/\psi +\pi (K)$ in covariant confined quark model

Abstract

In the wake of the recent measurements of the decays $B_c\to J/\psi \pi (K)$ and $B_c\to J/\psi \ell {\nu }_{\ell }$ reported by the LHCb Collaboration we calculate the form factors for the $B_c\to J/\psi$ and $B_c\to {\eta }_c$ transitions in full kinematical region within covariant confined quark model. Then we use the calculated form factors to evaluate the partial decay widths of the above-mentioned semileptonic and nonleptonic decays of the $B_c$ meson. We find that the theoretical predictions on the ratios of ${\mathcal{R}}_{K^{+}/{\pi }^{+}}$ and ${\mathcal{R}}_{{\pi }^{+}/{\mu }^{+}\nu }$ are in good agreement with last LHCb-data. However, the prediction for the ${\mathcal{R}}_{J/\psi }$ is found to be underestimated.

References in corpus (8)

• Measurement of the ratio of branching fractions $\mathcal{B}(B_c^{+}\to J/\psi {\tau }^{+}{\nu }_{\tau })$/$\mathcal{B}(B_c^{+}\to J/\psi {\mu }^{+}{\nu }_{\mu })$
• Exclusive semileptonic and nonleptonic decays of the Bc meson
• Implications of new physics in the decays $B_c\to (J/\psi ,{\eta }_c)\tau \nu$
• S-wave ground state charmonium decays of $B_c$ mesons in the perturbative QCD approach
• Measurement of the ratio of $B_c^{+}$ branching fractions to $J/\psi {\pi }^{+}$ and $J/\psi {\mu }^{+}{\nu }_{\mu }$
• Study of $B_c$ decays into charmonia and $D$ mesons
• Semileptonic decays of $B_c$ mesons into charmonium states
• Exclusive Decays and Lifetime of B_c Meson in QCD sum rules

Cited by in corpus (38)

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• Unified Framework for $B$-Anomalies, Muon $g-2$, and Neutrino Masses
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• A near-minimal leptoquark model for reconciling flavour anomalies and generating radiative neutrino masses
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• Lepton flavor universality violation in semileptonic tree level weak transitions
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• Model-Independent Determination of $B_c^{+}\to {\eta }_c{\ell }^{+}\nu$ Form Factors
• The role of right-handed neutrinos in $b\to c\tau (\pi {\nu }_{\tau },\rho {\nu }_{\tau },\mu {\bar{\nu }}_{\mu }{\nu }_{\tau }){\bar{\nu }}_{\tau }$ from visible final-state kinematics
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• Model-Independent Prediction of $R({\eta }_c)$
• New physics and the tau polarization vector in $b\to c\tau {\bar{\nu }}_{\tau }$ decays
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• New physics effects on ${\Lambda }_b\to {\Lambda }_c^{\ast }\tau {\bar{\nu }}_{\tau }$ decays
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• Prediction of various observables for $B_s^0\to D_s^{(\ast )-}{\ell }^{+}{\nu }_{\ell }$ within covariant confined quark model
• Semileptonic Decay of $B_c$ to ${\eta }_c$ and $J/\psi$ on the Light Front
• New physics in the angular distribution of $B_c^{-}\to J/\psi (\to {\mu }^{+}{\mu }^{-}){\tau }^{-}(\to {\pi }^{-}{\nu }_{\tau }){\bar{\nu }}_{\tau }$ decay
• Searching $B_c^{\ast }$ via conservation laws
• $B\to K^{(\ast )}\nu \bar{\nu }$ in covariant confined quark model
• $B_c^{\ast }$ meson parameters and radiative decay width within the covariant confined quark model
• Relations between $b\to c\tau \nu$ Decay Modes in Scalar Models
• Visible energy and angular distributions of the charged particle from the $\tau -$decay in $b\to c\tau (\mu {\bar{\nu }}_{\mu }{\nu }_{\tau },\pi {\nu }_{\tau },\rho {\nu }_{\tau }){\bar{\nu }}_{\tau }$ reactions
• Effects of vector leptoquarks on ${\Lambda }_b\to {\Lambda }_c\ell {\overline{\nu }}_{\ell }$ decay
• Anomalies in Weak Decays of Hadrons Containing a b Quark
• Inclusive quasielastic (anti-)neutrino nucleus scattering within the Standard Model and beyond
• Probing New Physics and CP Violation in ${\nu }_{\tau }n\to {\Lambda }_c{\tau }^{-}({\pi }^{-}{\nu }_{\tau })$ and ${\bar{\nu }}_{\tau }p\to \Lambda {\tau }^{+}({\pi }^{+}{\bar{\nu }}_{\tau })$