Implications of new physics in the decays $B_c\to (J/\psi ,{\eta }_c)\tau \nu$

Abstract

We study the semileptonic decays of the $B_c$ meson into final charmonium states within the standard model and beyond. The relevant hadronic transition form factors are calculated in the framework of the covariant confined quark model developed by us. We focus on the tau mode of these decays, which may provide some hints of new physics effects. We extend the standard model by assuming a general effective Hamiltonian describing the $b\to c\tau \nu$ transition, which consists of the full set of the four-fermion operators. We then obtain experimental constraints on the Wilson coefficients corresponding to each operator and provide predictions for the branching fractions and other polarization observables in different new physics scenarios.

23 pages, 10 figures, 3 tables, References updated, a version to appear in Phys. Rev. D

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• \large\bf $B_c\to (J/\Psi ,{\eta }_c)\tau \nu$ semileptonic decays within Standard model and beyond
• Form factors for semileptonic, nonleptonic and rare $B(B_s)$ meson decays
• Semileptonic decays of $B_c$ meson to S-wave charmonium states in the perturbative QCD approach
• Exclusive decays $B\to {\ell }^{-}\bar{\nu }$ and $B\to D^{(\ast )}{\ell }^{-}\bar{\nu }$ in the covariant quark model
• Polarization effects in the cascade decay Lambda_b -> Lambda(-> p pi-) + J/psi(-> l+ l-) in the covariant confined quark model
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• Bc Meson Formfactors and Bc-->PV Decays Involving Flavor Dependence of Transverse Quark Momentum
• Light baryons and their electromagnetic interactions in the covariant constituent quark model
• Exclusive and Inclusive Decays of the B_c Meson in the Light-Front ISGW Model
• Exclusive decays $J/\psi \to D_{(s)}^{(\ast )-}{\ell }^{+}{\nu }_{\ell }$ in a covariant constituent quark model with infrared confinement
• Semileptonic decays of $B_c$ mesons into charmonium states
• $B\to D^{(\ast )}\tau {\nu }_{\tau }$ in the 2HDM with an anomalous $\tau$ coupling

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• New physics solutions for $R_D$ and $R_{D^{\ast }}$
• Revisiting the new-physics interpretation of the $b\to c\tau \nu$ data
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• The decays $B_c\to J/\psi +\bar{\ell }{\nu }_{\ell }$ and $B_c\to J/\psi +\pi (K)$ in covariant confined quark model
• On lepton flavour universality in semileptonic $B_c\to {\eta }_c,J/\psi$ decays
• The role of right-handed neutrinos in $b\to c\tau \bar{\nu }$ anomalies
• $B_c$ mesons and their properties on the light front
• $b\to c\tau \nu$ 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
• Investigation of Effects of New Physics in ${\Lambda }_b\to {\Lambda }_c\tau {\bar{\nu }}_{\tau }$ Decay
• Revisit to the $b\to c\tau \nu$ transition: in and beyond the SM
• Impact of ${\Lambda }_b\to {\Lambda }_c\tau \nu$ measurement on New Physics in $b\to cl\nu$ transitions
• Probing new physics in semileptonic ${\Lambda }_b$ decays
• Semileptonic Decays of Charmed Mesons to Light Scalar Mesons
• Beyond $\mathcal{R}(D^{(\ast )})$ with the general 2HDM-III for $b\to c\tau \nu$
• Lepton flavor universality violation in semileptonic tree level weak transitions
• Semileptonic decays $B_c\to ({\eta }_c,J/\psi )l{\bar{\nu }}_l$ in the "PQCD + Lattice" approach
• Phenomenology of $b\to c\tau \bar{\nu }$ decays in a scalar leptoquark model
• Probing New Physics with $\bar{B}\to \rho (770){\ell }^{-}{\bar{\nu }}_{\ell }$ and $\bar{B}\to a_1(1260){\ell }^{-}{\bar{\nu }}_{\ell }$
• 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
• Maximizing the Impact of New Physics in $b\to c\tau \nu$ Anomalies
• Investigation of Effects of New Physics in $c\to (s,d){\ell }^{+}{\nu }_{\ell }$ Transitions
• Precision Model-Independent Bounds from Global Analysis of $b\to c\ell \nu$ Form Factors
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• Semileptonic $B_c\to {\eta }_c,J/\psi$ transitions
• Tests of the Standard Model in $B\to D\ell {\nu }_{\ell }$, $B\to D^{\ast }\ell {\nu }_{\ell }$ and $B_c\to J/\psi \ell {\nu }_{\ell }$
• New physics and the tau polarization vector in $b\to c\tau {\bar{\nu }}_{\tau }$ decays
• Model-Independent Prediction of $R({\eta }_c)$
• Lepton mass effects in exclusive semileptonic $B_c$-meson decays
• Scrutinizing New Physics in Semi-leptonic $B_c\to J/\psi \tau \nu$ Decay
• $D^{\ast }$ Polarization as an Additional Constraint on New Physics in the $b\to c\tau {\bar{\nu }}_{\tau }$ Transition
• ${\bar{B}}_c\to {\eta }_c$, ${\bar{B}}_c\to J/\psi$ and $\bar{B}\to D^{(\ast )}$ semileptonic decays including new physics
• Semileptonic decays of $B_c$ meson to $P$-wave charmonium states
• Systematic analysis of the form factors of $B_c\to {\eta }_c$, $J/\psi$ and corresponding weak decays
• Form-factor-independent test of lepton universality in semileptonic heavy meson and baryon decays
• Relativistic calculations of $R(D^{(\ast )})$, $R(D_s^{(\ast )})$, $R({\eta }_c)$ and $R(J/\psi )$
• Next-to-leading order QCD calculation of $B_c$ to charmonium tensor form factors
• Exclusive semileptonic $B_c$-meson decays to radially excited charmonium and charm meson states
• Weak nonleptonic decays of vector B-mesons
• $b\to c\tau \bar{\nu }$ decays in supersymmetry with $R$-parity violation
• New physics effects on ${\Lambda }_b\to {\Lambda }_c^{\ast }\tau {\bar{\nu }}_{\tau }$ decays
• Analyzing lepton flavor universality in the decays ${\Lambda }_b\to {\Lambda }_c^{(\ast )}({\frac{1}{2}}^{\pm },{\frac{3}{2}}^{-})+\ell {\bar{\nu }}_{\ell }$
• Semileptonic Decay of $B_c$ to ${\eta }_c$ and $J/\psi$ on the Light Front
• Probing New Physics in light of recent developments in $b\to c\ell \nu$ transitions
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• ${\eta }_c$ leading-twist distribution amplitude and the $B_c\to {\eta }_c\ell {\bar{\nu }}_{\ell }$ semileptonic decays using QCD Sum Rules
• Radiative transitions of charmonium states in the covariant confined quark model
• Probing New Physics and CP Violation in ${\nu }_{\tau }n\to {\Lambda }_c{\tau }^{-}({\pi }^{-}{\nu }_{\tau })$ and ${\bar{\nu }}_{\tau }p\to \Lambda {\tau }^{+}({\pi }^{+}{\bar{\nu }}_{\tau })$
• Predictions for ${\Lambda }_b\to {\Lambda }_c\tau \bar{\nu }$ in BLSSM with Inverse seesaw