Diagnosing New Physics in $b\to c\tau {\nu }_{\tau }$ decays in the light of the recent BaBar result

Abstract

The BaBar Collaboration has recently reported the measurement of the ratio of the branching fractions of $\bar{B}\to D(D^{\ast }){\tau }^{-}\overline{{\nu }_{\tau }}$ to $\bar{B}\to D(D^{\ast }){\ell }^{-}\overline{{\nu }_{\ell }}$ which deviates from the Standard Model prediction by 2$\sigma$(2.7$\sigma$). This deviation goes up to 3.4$\sigma$ level when the two measurements in the $D$ and $D^{\ast }$ modes are taken together and could indicate new physics. Using an effective Lagrangian for the new physics we study the implication of these results and calculate other observables that can shed light on the nature of the new physics. We show that the measurements of the forward-backward asymmetries and the $\tau$ and $D^{\ast }$ polarization fractions can distinguish among the various couplings of the new physics operators.

Some typos corrected (not updated in journal)

References in corpus (31)

• Heavy Quark Symmetry
• Evidence for an excess of B -> D(*) Tau Nu decays
• Symmetry-breaking corrections to heavy-to-light B meson form factors at large recoil
• On the B to D* tau nu Sensitivity to New Physics
• Dispersive Bounds on the Shape of B -> D^(*) l nu Form Factors
• Implications of lepton flavor universality violations in B decays
• Probing Novel Scalar and Tensor Interactions from (Ultra)Cold Neutrons to the LHC
• Explaining B->Dτν, B->D*τνand B->τνin a 2HDM of type III
• Second Order Power Corrections in the Heavy Quark Effective Theory I. Formalism and Meson Form Factors
• Averages of b-hadron, c-hadron, and tau-lepton Properties
• Evidence of the Purely Leptonic Decay B- --> tau- nu_tau-bar
• Observation of B^0 \to D^{*-} τ^+ ν_τ decay at Belle
• Charged-Higgs effects in a new B -> D tau nu differential decay distribution
• Observation of B+ -> Dbar*0 tau+ nu_tau and Evidence for B+ -> Dbar^0 tau+ nu_tau at Belle
• Observation of the Semileptonic Decays B --> D* tau nubar and Evidence for B --> D tau nubar
• Measurement of |V_cb| and the Form-Factor Slope in Bbar -> D l- nubar Decays in Events Tagged by a Fully Reconstructed B Meson
• Helicity Analysis of Semileptonic Hyperon Decays Including Lepton Mass Effects
• R-parity-violating SUSY and CP violation in B --> phi K_s
• Measurement of the form factors of the decay B0 -> D*- ell+ nu and determination of the CKM matrix element |Vcb|
• Constraints on the charged scalar effects using the forward-backward asymmetry on $B\to D^{(\ast )}\tau \overline{{\nu }_{\tau }}$
• Top quark forward-backward asymmetry at Tevatron and its implications at the LHC
• Effects Of Kaluza-Klein Excited W On Single Top Quark Production At Tevatron
• New Physics in Bs -> J/psi phi: a General Analysis
• Lepton angular asymmetries in semileptonic charmful B decays
• $B_s$ Mixing and New Physics in hadronic $b\to s\bar{q}q$ transitions
• The 2-3 symmetry: Flavour Changing $b$, $\tau$ Decays and Neutrino Mixing
• Do new data on [B+ -> tau+ nu_tau] decays point to an early discovery of supersymmetry at the LHC?
• U(2)^5 flavor symmetry and lepton universality violation in W -> tau nu_tau
• Suppressed FCNC in New Physics with Shared Flavor Symmetry
• Nonstandard interactions of tau neutrino via charged Higgs and $W^{\prime }$ contribution
• Measurement of B -> D^(*) tau nu using full reconstruction tags

Cited by in corpus (110)

• Measurement of an Excess of B -> D(*) Tau Nu Decays and Implications for Charged Higgs Bosons
• Measurement of the $\tau$ lepton polarization and $R(D^{\ast })$ in the decay $\bar{B}\to D^{\ast }{\tau }^{-}{\bar{\nu }}_{\tau }$
• Flavor-phenomenology of two-Higgs-doublet models with generic Yukawa structure
• Effective field theory approach to $b\to s\ell {\ell }^{(\prime )}$, $B\to K^{(\ast )}\nu \bar{\nu }$ and $B\to D^{(\ast )}\tau \nu$ with third generation couplings
• Testing leptoquark models in $\bar{B}\to D^{(\ast )}\tau \bar{\nu }$
• Simultaneous Explanation of the $R_K$ and $R(D^{(\ast )})$ Puzzles
• Flavor models for $\bar{B}\to D^{(\ast )}\tau \bar{\nu }$
• The lifetime of the $B_c^{-}$ meson and the anomalies in $B\to D^{(\ast )}\tau \nu$
• A perturbed lepton-specific two-Higgs-doublet model facing experimental hints for physics beyond the Standard Model
• New physics in the weak interaction of $\bar{B}\to D^{(\ast )}\tau \bar{\nu }$
• Measurement of the $\tau$ lepton polarization and $R(D^{\ast })$ in the decay $\bar{B}\to D^{\ast }{\tau }^{-}{\bar{\nu }}_{\tau }$ with one-prong hadronic $\tau$ decays at Belle
• Scalar contributions to $b\to c(u)\tau \nu$ transitions
• Matching of gauge invariant dimension 6 operators for $b\to s$ and $b\to c$ transitions
• $R_{D^{(\ast )}}$ anomaly: A possible hint for natural supersymmetry with $R$-parity violation
• Minimally flavored colored scalar in $\bar{B}\to D^{(\ast )}\tau \bar{\nu }$ and the mass matrices constraints
• New Physics effect on $B_c\to J/\psi \tau \bar{\nu }$ in relation to the $R_{D^{(\ast )}}$ anomaly
• Excesses of muon $g-2$, $R_{D^{(\ast )}}$, and $R_K$ in a leptoquark model
• The semileptonic decay Lambda_b -> Lambda_c + tau(-) + antinu_tau in the covariant confined quark model
• Impact of polarization observables and $B_c\to \tau \nu$ on new physics explanations of the $b\to c\tau \nu$ anomaly
• On the anomalous enhancement observed in $B\to D^{(\ast )}\tau {\bar{\nu }}_{\tau }$ decays
• Towards a unified explanation of $R_{D^{(\ast )}}$, $R_K$ and $(g-2{)}_{\mu }$ anomalies in a left-right model with leptoquarks
• Combined explanations of B-physics anomalies: the sterile neutrino solution
• Indirect Probes of the MSSM after the Higgs Discovery
• Addendum to "Impact of polarization observables and $B_c\to \tau \nu$ on new physics explanations of the $b\to c\tau \nu$ anomaly"
• Phenomenology of ${\Lambda }_b\to {\Lambda }_c\tau {\bar{\nu }}_{\tau }$ using lattice QCD calculations
• Explaining the $R_K$ and $R_{D^{(\ast )}}$ anomalies with vector leptoquarks
• B decays with $\tau$-leptons in non-universal left-right models
• New physics solutions for $R_D$ and $R_{D^{\ast }}$
• The Full $B\to D^{\ast }{\tau }^{-}\overline{{\nu }_{\tau }}$ Angular Distribution and CP violating Triple Products
• Lepton universality violation and right-handed currents in $b\to c\tau \nu$
• ${\Lambda }_b\to {\Lambda }_c\tau {\bar{\nu }}_{\tau }$ Decay in the Standard Model and with New Physics
• Analyzing new physics in the decays ${\bar{B}}^0\to D^{(\ast )}{\tau }^{-}{\bar{\nu }}_{\tau }$ with form factors obtained from the covariant quark model
• Hints of R-parity violation in B decays into $\tau \nu$
• New Physics in the Visible Final States of $B\to D^{(\ast )}\tau \nu$
• LHCb anomaly and $B$ physics in flavored Z${}^{\prime }$ models with flavored Higgs doublets
• A Challenge to Lepton Universality in B Meson Decays
• The Azimuthal $B\to D^{\ast }{\tau }^{-}\overline{{\nu }_{\tau }}$ Angular Distribution with Tensor Operators
• D* polarization as a probe to discriminate new physics in B --> D* tau nubar
• Probing New Physics with $q^2$ distributions in $\bar{B}\to D^{(\ast )}\tau \bar{\nu }$
• Consequences of R-Parity violating interactions for anomalies in $\bar{B}\to D^{(\ast )}\tau \bar{\nu }$ and $b\to s{\mu }^{+}{\mu }^{-}$
• Explaining the $B\to K^{\ast }{\mu }^{+}{\mu }^{-}$ data with scalar interactions
• Probing new physics in ${\bar{B}}^0\to D^{(\ast )}{\tau }^{-}{\bar{\nu }}_{\tau }$ using the longitudinal, transverse, and normal polarization components of the tau lepton
• Charged-Higgs on $R_{D^{(\ast )}}$, $\tau$ polarization, and FBA
• \large\bf $B_c\to (J/\Psi ,{\eta }_c)\tau \nu$ semileptonic decays within Standard model and beyond
• ${\Lambda }_b\to ({\Lambda }_c,p)\tau \nu$ decays within standard model and beyond
• Effective theory approach to new physics in $b\to u$ and $b\to c$ leptonic and semileptonic decays
• Constraints on the charged scalar effects using the forward-backward asymmetry on $B\to D^{(\ast )}\tau \overline{{\nu }_{\tau }}$
• Exclusive decays $B\to {\ell }^{-}\bar{\nu }$ and $B\to D^{(\ast )}{\ell }^{-}\bar{\nu }$ in the covariant quark model
• Looking for possible new physics in $B\to D^{(\ast )}\tau {\nu }_{\tau }$ in light of recent data
• Scalar doublet models confront $\tau$ and $b$ anomalies
• New physics in the kinematic distributions of $\bar{B}\to D^{(\ast )}{\tau }^{-}(\to {\ell }^{-}{\bar{\nu }}_{\ell }{\nu }_{\tau }){\bar{\nu }}_{\tau }$
• Semileptonic decays $B\to D^{(\ast )}l\nu$ in the perturbative QCD factorization approach
• $b\to c\tau \nu$ Transitions in the Standard Model Effective Field Theory
• Asymmetry Observables and the Origin of $R_{D^{(\ast )}}$ Anomalies
• Revisit to the $b\to c\tau \nu$ transition: in and beyond the SM
• $\bar{B}\to D\tau {\bar{\nu }}_{\tau }$ vs. $\bar{B}\to D\mu {\bar{\nu }}_{\mu }$
• Investigation of Effects of New Physics in ${\Lambda }_b\to {\Lambda }_c\tau {\bar{\nu }}_{\tau }$ Decay
• Impact of ${\Lambda }_b\to {\Lambda }_c\tau \nu$ measurement on New Physics in $b\to cl\nu$ transitions
• Probing the R-parity violating supersymmetric effects in the exclusive b\to c\ell^-\barν_\ell decays
• 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 $b\to c\tau \nu$
• Model independent analysis of $b\to (c,u)\tau \nu$ leptonic and semileptonic decays
• R-parity violating solutions to the $R_{D^{(\ast )}}$ anomaly and their GUT-scale unifications
• Study of ${\bar{B}}_s^0\to (D_s^{+},D_s^{\ast +})l^{-}{\bar{\nu }}_l$ decays in the pQCD factorization approach
• Maximizing the Impact of New Physics in $b\to c\tau \nu$ Anomalies
• CP violation in $B\to D\tau {\nu }_{\tau }$ using multi-pion tau decays
• Model-independent method for measuring the angular coefficients of $B^0\to D^{\ast -}{\tau }^{+}{\nu }_{\tau }$ decays
• Signature of Lepton flavor universality violation in $B_s\to D_s\tau \nu$ semileptonic decays
• CP Violation in ${\bar{B}}^0\to D^{\ast +}{\mu }^{-}{\bar{\nu }}_{\mu }$
• The $B\to D^{(\ast )}l{\nu }_l$ decays in the pQCD approach with the Lattice QCD input
• B decay anomalies in an effective theory
• Semileptonic decays $B/B_s\to (D^{(\ast )},D_s^{(\ast )})l{\nu }_l$ in the PQCD approach with the lattice QCD input
• New physics in inclusive $B\to X_c\ell \bar{\nu }$ decay in light of $R(D^{(\ast )})$ measurements
• Phenomenology of flavorful composite vector bosons in light of $B$ anomalies
• The measurable angular distribution of ${\Lambda }_b^0\to {\Lambda }_c^{+}(\to {\Lambda }^0{\pi }^{+}){\tau }^{-}(\to {\pi }^{-}{\nu }_{\tau }){\bar{\nu }}_{\tau }$ decay
• A Complete Framework for Tau Polarimetry in $B\to D^{(\ast )}\tau \nu$ Decays
• Rare semileptonic $B\to K^{\ast }{\ell }^{+}{\ell }^{-}$ decays in RS${}_c$ model
• Study of semileptonic ${\bar{B}}^{\ast }\to P\ell {\bar{\nu }}_{\ell }$ decays
• New physics in inclusive semileptonic $B$ decays including nonperturbative corrections
• B -> D(*) Tau Nu decays in two-Higgs-doublet models
• Semileptonic and leptonic $B$ decays, circa 2016
• Charged Higgs boson contribution to $B_q^{-}\to \ell \bar{\nu }$ and $\bar{B}\to (P,V)\ell \bar{\nu }$ in a generic two-Higgs doublet model
• Constraints on Scalar Leptoquark from Kaon Sector
• Impact of vector new physics couplings on $B_s\to (K,K^{\ast })\tau \nu$ and $B\to \pi \tau \nu$ decays
• Nonstandard interactions of tau neutrino via charged Higgs and $W^{\prime }$ contribution
• B-Meson Decays into Final States with a tau Lepton
• ${\bar{B}}_c\to {\eta }_c$, ${\bar{B}}_c\to J/\psi$ and $\bar{B}\to D^{(\ast )}$ semileptonic decays including new physics
• $D^{\ast }$ Polarization as an Additional Constraint on New Physics in the $b\to c\tau {\bar{\nu }}_{\tau }$ Transition
• Light stop in the MSSM after LHC Run 1
• Progress on semi-leptonic $B_{(s)}$ decays
• Detailed Study of the Decay Lambda_b --> Lambda_c tau {\bar ν}_τ
• Relativistic calculations of $R(D^{(\ast )})$, $R(D_s^{(\ast )})$, $R({\eta }_c)$ and $R(J/\psi )$
• Status of $|V_{cb}|$ and $|V_{ub}|$ CKM matrix elements
• A Challenge to Lepton Universality in B Meson Decays
• Predictions of $B_c\to (D,D^{\ast })l\nu$ decay observables in the standard model
• Determination of mass hierarchy with ${\nu }_{\mu }\to {\nu }_{\tau }$ appearance and the effect of nonstandard interactions
• Physical observables in the decay ${\Lambda }_b\to {\Lambda }_c(\to \Lambda +\pi )+{\tau }^{-}+{\bar{\nu }}_{\tau }$
• Searching for New Physics in Semi-Leptonic Baryon Decays
• An Imperative study of the angular observables in ${\Lambda }_b\to {\Lambda }_c^{+}(\to \Lambda {\pi }^{+}){\ell }^{-}{\bar{\nu }}_{\ell }$ decay and probing the footprint of new physics
• Corrections to $R_D$ and $R_{D^{\ast }}$ in the BLMSSM
• Challenges for New Physics in the Flavour Sector
• Exploring the $\tau$ polarization in $B\to X\tau \bar{\nu }$ along different axes
• Explaining the $\mathcal{R}(D)$ and $\mathcal{R}(D^{\ast })$ Anomalies in the $B-L$ Supersymmetric Standard Model with Inverse Seesaw
• Is there really a $W\to \tau \nu$ puzzle?
• The semileptonic decays of $B/B_s$ meson in the perturbative QCD approach: A short review
• Tau neutrino as a probe of nonstandard interactions via charged Higgs and $W^{\prime }$ contribution
• Diagnosing New Physics with LUV and LFV B Decays
• Fingerprinting the presence of extra scalars in the $h\to Vf{f}^{\prime }$ forward-backward asymmetry
• Semi-leptonic Decay of Lambda-b in the Standard Model and with New Physics
• Semileptonic $B\to \bar{D}$ transition in nuclear medium