Lepton universality violation and right-handed currents in $b\to c\tau \nu$

Abstract

We consider the recent LHCb result for $B_c\to J/\psi \tau \nu$ in conjunction with the existing anomalies in $R(D)$ and $R(D^{\star })$ within the framework of a right-handed current with enhanced couplings to the third generation. The model predicts a linear relation between the observables and their SM values in terms of two combinations of parameters. The strong constraints from $b\to s\gamma$ on $W-W^{\prime }$ mixing effectively remove one of the combinations of parameters resulting in an approximate proportionality between all three observables and their SM values. To accommodate the current averages for $R(D)$ and $R(D^{\star })$, the $W^{\prime }$ mass should be near 1 TeV, and possibly accessible to direct searches at the LHC. In this scenario we find that $R(J/\psi )$ is enhanced by about 20\% with respect to its SM value and about 1.5$\sigma$ below the central value of the LHCb measurement. The predicted $d\Gamma /d{q}^2$ distribution for $B\to D(D^{\star })\tau \nu$ is in agreement with the measurement and the model satisfies the constraint from the $B_c$ lifetime.

12 papers, 4 fiures. Published version in Phys. Let. B779, 52(2018)

References in corpus (12)

• The trouble with $H_0$
• Estimate of BR(B -> X_s gamma) at O(alpha_s^2)
• On the B to D* tau nu Sensitivity to New Physics
• Measurement of the branching ratio of ${\bar{B}}^0\to D^{\ast +}{\tau }^{-}{\bar{\nu }}_{\tau }$ relative to ${\bar{B}}^0\to D^{\ast +}{\ell }^{-}{\bar{\nu }}_{\ell }$ decays with a semileptonic tagging method
• The lifetime of the $B_c^{-}$ meson and the anomalies in $B\to D^{(\ast )}\tau \nu$
• New physics in the weak interaction of $\bar{B}\to D^{(\ast )}\tau \bar{\nu }$
• Exclusive semileptonic and nonleptonic decays of the Bc meson
• Study of exclusive semileptonic and nonleptonic decays of $B_c^{-}$ in a nonrelativistic quark model
• B -> D tau nu Branching Ratios: Opportunity for Lattice QCD and Hadron Colliders
• $B_s-{\bar{B}}_s$ Mixing constraints on FCNC and a non-universal $Z^{\prime }$
• Ansatz for small FCNC with a non-universal $Z^{\prime }$
• Remarks on the Standard Model predictions for $R(D)$ and $R(D^{\ast })$

Cited by in corpus (45)

• The Mono-Tau Menace: From $B$ Decays to High-$p_T$ Tails
• Impact of polarization observables and $B_c\to \tau \nu$ on new physics explanations of the $b\to c\tau \nu$ anomaly
• Addendum to "Impact of polarization observables and $B_c\to \tau \nu$ on new physics explanations of the $b\to c\tau \nu$ anomaly"
• Footprints of New Physics in $b\to c\tau \nu$ Transitions
• Implications of new physics in the decays $B_c\to (J/\psi ,{\eta }_c)\tau \nu$
• Revisiting the new-physics interpretation of the $b\to c\tau \nu$ data
• $R(D^{(\ast )})$ from $W^{\prime }$ and right-handed neutrinos
• $D^{\ast }$ polarization vs. $R_{D^{(\ast )}}$ anomalies in the leptoquark models
• Challenges in Semileptonic B Decays
• On lepton flavour universality in semileptonic $B_c\to {\eta }_c,J/\psi$ decays
• Right-handed Neutrinos and $R(D^{(\ast )})$
• A Theory of $R(D^{\ast },D)$ Anomaly With Right-Handed Currents
• $b\to c\tau \nu$ 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
• Test of the $R(D^{(\ast )})$ anomaly at the LHC
• Impact of ${\Lambda }_b\to {\Lambda }_c\tau \nu$ measurement on New Physics in $b\to cl\nu$ transitions
• Probing a simplified, $W^{\prime }$ model of $R(D^{(\ast )})$ anomalies using $b$-tags, $\tau$ leptons and missing energy
• Beyond $\mathcal{R}(D^{(\ast )})$ with the general 2HDM-III for $b\to c\tau \nu$
• $R_{K^{(\ast )}}^{\nu }$ and non-standard neutrino interactions
• R-parity violating solutions to the $R_{D^{(\ast )}}$ anomaly and their GUT-scale unifications
• 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
• Investigation of Effects of New Physics in $c\to (s,d){\ell }^{+}{\nu }_{\ell }$ Transitions
• A Measurable Angular Distribution for $\bar{B}\to D^{\ast }{\tau }^{-}{\bar{\nu }}_{\tau }$ Decays
• CP Violation in ${\bar{B}}^0\to D^{\ast +}{\mu }^{-}{\bar{\nu }}_{\mu }$
• Neutral Higgs decays $H\to Z\gamma ,\gamma \gamma$ in 3-3-1 models
• General one-loop formulas for decay $h\to Z\gamma$
• A Complete Framework for Tau Polarimetry in $B\to D^{(\ast )}\tau \nu$ Decays
• Constraints on new physics from $K\to \pi \nu \bar{\nu }$
• Analysing the charged scalar boson contribution to the charged-current $B$ meson anomalies
• Semileptonic decays of $B^{(\ast )}$, $D^{(\ast )}$ into $\nu l$ and pseudoscalar or vector mesons
• Constraining heavy neutral gauge boson $Z^{\prime }$ in the 3 - 3 - 1 models by weak charge data of Cesium and proton
• Detailed Study of the Decay Lambda_b --> Lambda_c tau {\bar ν}_τ
• Semileptonic decays of $B_c$ meson to $P$-wave charmonium states
• $b\to c\tau \bar{\nu }$ decays in supersymmetry with $R$-parity violation
• Probing New Physics in light of recent developments in $b\to c\ell \nu$ transitions
• Extra gauge bosons and lepton flavor universality violation in ${\rm Y}$ and $B$ meson decays
• Analysis of $b\to c\tau {\bar{\nu }}_{\tau }$ anomalies using weak effective Hamiltonian with complex couplings
• Helicity amplitudes in $B\to D^{\ast }\bar{\nu }l$ decay
• Polarization in (quasi-)two-body decays and new physics
• Polarization amplitudes in ${\tau }^{-}\to {\nu }_{\tau }VP$ decay beyond the standard model
• Explaining the $\mathcal{R}(D)$ and $\mathcal{R}(D^{\ast })$ Anomalies in the $B-L$ Supersymmetric Standard Model with Inverse Seesaw
• Addressing the $R_{\tau /\mu ,e}\left(D^{(\ast )}\right)$ puzzle through New Physics four-fermion operators and their impact on ${\Lambda }_b\to {\Lambda }_c\tau {\bar{\nu }}_{\tau }$ decay
• The Angular Observables of ${\Lambda }_b\to {\Lambda }_c(\to {\Lambda }^0{\pi }^{+}){\tau }^{-}(\to {\pi }^{-}{\nu }_{\tau }){\bar{\nu }}_{\tau }$ within the Paradigm of FCCC Anomalies
• ${\eta }_c$ leading-twist distribution amplitude and the $B_c\to {\eta }_c\ell {\bar{\nu }}_{\ell }$ semileptonic decays using QCD Sum Rules