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 (25)

• Weak Decays Beyond Leading Logarithms
• Measurement of the $\tau$ lepton polarization and $R(D^{\ast })$ in the decay $\bar{B}\to D^{\ast }{\tau }^{-}{\bar{\nu }}_{\tau }$
• 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
• Weak decays of the B_c meson to charmonium and D mesons in the relativistic quark model
• Using Heavy Quark Spin Symmetry in Semileptonic $B_c$ Decays
• The semileptonic decays of the B_c meson
• Semileptonic decays $B_c\to ({\eta }_c,J/\Psi )l\nu$ in the perturbative QCD approach
• Prospects for the Bc Studies at LHCb
• Semileptonic and non-leptonic B_c decays
• The B_c Meson Lifetime in the Light--Front Constituent Quark Model
• Implications of new physics in the decays $B_c\to (J/\psi ,{\eta }_c)\tau \nu$
• First observation of the decay Bc+ to J/psi pi+pi-pi+
• First observation of the decay $B_c^{+}\to J/\psi K^{+}$
• $B_c$ Exclusive Decays to Charmonium and a Light Meson at Next-to-Leading Order Accuracy
• \large\bf $B_c\to (J/\Psi ,{\eta }_c)\tau \nu$ semileptonic decays within Standard model and beyond
• Semileptonic decays of $B_c$ meson to S-wave charmonium states in the perturbative QCD approach
• S-wave ground state charmonium decays of $B_c$ mesons in the perturbative QCD approach
• Transitions of $B_c\to \psi (1S,2S)$ and the modified harmonic oscillator wave function in LFQM
• Measurement of the ratio of branching fractions $\mathcal{B}(B_c^{+}\to J/\psi K^{+})/\mathcal{B}(B_c^{+}\to J/\psi {\pi }^{+})$
• 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
• Exclusive and Inclusive Decays of the B_c Meson in the Light-Front ISGW Model
• Semileptonic decays of $B_c$ mesons into charmonium states
• Exclusive Decays and Lifetime of B_c Meson in QCD sum rules

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• A near-minimal leptoquark model for reconciling flavour anomalies and generating radiative neutrino masses
• The role of right-handed neutrinos in $b\to c\tau \bar{\nu }$ anomalies
• Unified explanation of flavor anomalies, radiative neutrino mass and ANITA anomalous events in a vector leptoquark model
• $b\to c\tau \nu$ Transitions in the Standard Model Effective Field Theory
• Charged current $b\to c\tau {\bar{\nu }}_{\tau }$ anomalies in a general $W^{\prime }$ boson scenario
• Model-Independent Bounds on $R(J/\psi )$
• Lepton flavor universality violation in semileptonic tree level weak transitions
• Model independent investigation of the $R_{J/\psi ,{\eta }_c}$ and ratios of decay widths of semileptonic $B_c$ decays into a P-wave charmonium
• 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
• $R_{D^{(\ast )}}$ in custodial warped space
• Form factors and branching fraction calculations for $B_s\to D_s^{(\ast )}{\ell }^{+}{\nu }_{\ell }$ in view of LHCb observation
• Semileptonic $B_c\to {\eta }_c,J/\psi$ transitions
• Exclusive nonleptonic Bc-meson decays to S-wave charmonium states
• Model-Independent Prediction of $R({\eta }_c)$
• New physics and the tau polarization vector in $b\to c\tau {\bar{\nu }}_{\tau }$ decays
• Production of $Z_c(3900$) and $Z_c(4020)$ in $B_c$ decay
• ${\bar{B}}_c\to {\eta }_c$, ${\bar{B}}_c\to J/\psi$ and $\bar{B}\to D^{(\ast )}$ semileptonic decays including new physics
• Weak nonleptonic decays of vector B-mesons
• New physics effects on ${\Lambda }_b\to {\Lambda }_c^{\ast }\tau {\bar{\nu }}_{\tau }$ decays
• $B_c\to J/\psi$ helicity form factors and the $B_c^{+}\to J/\psi +(P,V,{\ell }^{+}{\nu }_{\ell })$ decays
• 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 ${\bar{\nu }}_{\tau }p\to \Lambda {\tau }^{+}({\pi }^{+}{\bar{\nu }}_{\tau })$