Model independent analysis of $b\to (c,u)\tau \nu$ leptonic and semileptonic decays

Abstract

Latest measurement of the ratio of branching ratios $R_D=\mathcal{B}(B\to D\tau \nu )/\mathcal{B}(B\to Dl\nu )$ and $R_{D^{\ast }}=\mathcal{B}(B\to D^{\ast }\tau \nu )/\mathcal{B}(B\to D^{\ast }l\nu )$, where $l$ is either an electron or muon, differs from the standard model expectation by $1.9\sigma$ and $3.3\sigma$, respectively. Similar tension has been observed in purely leptonic $B\to \tau \nu$ decays as well. In this context, we consider the most general effective Lagrangian in the presence of new physics and perform a model independent analysis to explore various new physics couplings. Motivated by the recently proposed new observables $R_D^{\tau }=R_D/\mathcal{B}(B\to \tau \nu )$ and $R_{D^{\ast }}^{\tau }=R_{D^{\ast }}/\mathcal{B}(B\to \tau \nu )$, we impose $2\sigma$ constraints coming from $R_D^{\tau }$ and $R_{D^{\ast }}^{\tau }$ in addition to the constraints coming from $R_D$, $R_{D^{\ast }}$, and $\mathcal{B}(B\to \tau \nu )$ to constrain the new physics parameter space. We study the impact of new physics on various observables related to $B_s\to (D_s,D_s^{\ast })\tau \nu$ and $B\to \pi \tau \nu$ decay processes.

arXiv comment24 pages, 7 figures, typos corrected, references added

References in corpus (61)

• Minimal Flavour Violation: an effective field theory approach
• Evidence for an excess of B -> D(*) Tau Nu decays
• Measurement of an Excess of B -> D(*) Tau Nu Decays and Implications for Charged Higgs Bosons
• Measurement of the branching ratio of $\bar{B}\to D^{(\ast )}{\tau }^{-}{\bar{\nu }}_{\tau }$ relative to $\bar{B}\to D^{(\ast )}{\ell }^{-}{\bar{\nu }}_{\ell }$ decays with hadronic tagging at Belle
• Measurement of the ratio of branching fractions $\mathcal{B}({\overline{B}}^0\to D^{\ast +}{\tau }^{-}{\overline{\nu }}_{\tau })/\mathcal{B}({\overline{B}}^0\to D^{\ast +}{\mu }^{-}{\overline{\nu }}_{\mu })$
• On the B to D* tau nu Sensitivity to New Physics
• Yukawa Alignment in the Two-Higgs-Doublet Model
• 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
• Implications of lepton flavor universality violations in B decays
• Simultaneous Explanation of the $R_K$ and $R(D^{(\ast )})$ Puzzles
• Probing Novel Scalar and Tensor Interactions from (Ultra)Cold Neutrons to the LHC
• The lifetime of the $B_c^{-}$ meson and the anomalies in $B\to D^{(\ast )}\tau \nu$
• Explaining B->Dτν, B->D*τνand B->τνin a 2HDM of type III
• Semileptonic decays of light quarks beyond the Standard Model
• Non-abelian gauge extensions for B-decay anomalies
• ${\Lambda }_b\to p{\ell }^{-}{\bar{\nu }}_{\ell }$ and ${\Lambda }_b\to {\Lambda }_c{\ell }^{-}{\bar{\nu }}_{\ell }$ form factors from lattice QCD with relativistic heavy quarks
• Higgs-mediated FCNCs: Natural Flavour Conservation vs. Minimal Flavour Violation
• Sensitivity to charged scalars in $B\to D^{(\ast )}\tau {\nu }_{\tau }$ and $B\to \tau {\nu }_{\tau }$ decays
• B- and D-meson decay constants from three-flavor lattice QCD
• Simultaneous Explanation of the $R_K$ and $R_{D^{(\ast )}}$ Puzzles: a Model Analysis
• Charged-Higgs phenomenology in the Aligned two-Higgs-doublet model
• B_c Decays and Lifetime in QCD Sum Rules
• Physics of B_c mesons
• $B\to \pi \ell {\nu }_l$ Width and $|V_{ub}|$ from QCD Light-Cone Sum Rules
• Phenomenology of an $SU(2)\times SU(2)\times U(1)$ model with lepton-flavour non-universality
• The Two Higgs Doublet of Type II facing flavour physics data
• Diagnosing New Physics in $b\to c\tau {\nu }_{\tau }$ decays in the light of the recent BaBar result
• Revisiting the one leptoquark solution to the $R(D^{(\ast )})$ anomalies and its phenomenological implications
• Charged Higgs Effects on Exclusive Semi-tauonic $\bbox{B}$ Decays
• The B and B_s Meson Decay Constants from Lattice QCD
• The semileptonic decay Lambda_b -> Lambda_c + tau(-) + antinu_tau in the covariant confined quark model
• On the anomalous enhancement observed in $B\to D^{(\ast )}\tau {\bar{\nu }}_{\tau }$ decays
• 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
• Constraining the Two-Higgs-Doublet-Model parameter space
• The $B_c$ Meson Lifetime
• Evidence of B-->tau nu decays with hadronic B tags
• Effects of right-handed charged currents on the determinations of |V_ub| and |V_cb|
• The effect of H^\pm on B^\pm -> τ^\pm νand B^\pm -> μ^\pm ν
• B decays with $\tau$-leptons in non-universal left-right models
• Phenomenology of semileptonic B-meson decays with form factors from lattice QCD
• The Full $B\to D^{\ast }{\tau }^{-}\overline{{\nu }_{\tau }}$ Angular Distribution and CP violating Triple Products
• Measurement of |V_cb| and the Form-Factor Slope in Bbar -> D l- nubar Decays in Events Tagged by a Fully Reconstructed B Meson
• ${\Lambda }_b\to {\Lambda }_c\tau {\bar{\nu }}_{\tau }$ 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
• A closer look at the $R_D$ and $R_{D^{\ast }}$ anomalies
• D* polarization as a probe to discriminate new physics in B --> D* tau nubar
• The Azimuthal $B\to D^{\ast }{\tau }^{-}\overline{{\nu }_{\tau }}$ Angular Distribution with Tensor Operators
• Consequences of R-Parity violating interactions for anomalies in $\bar{B}\to D^{(\ast )}\tau \bar{\nu }$ and $b\to s{\mu }^{+}{\mu }^{-}$
• Measurement of the form factors of the decay B0 -> D*- ell+ nu and determination of the CKM matrix element |Vcb|
• Weak decays of $B_s$ mesons to $D_s$ mesons in the relativistic quark model
• ${\Lambda }_b\to ({\Lambda }_c,p)\tau \nu$ decays within standard model and beyond
• Effective theory approach to new physics in $b\to u$ and $b\to c$ leptonic and semileptonic decays
• Exclusive decays $B\to {\ell }^{-}\bar{\nu }$ and $B\to D^{(\ast )}{\ell }^{-}\bar{\nu }$ in the covariant quark model
• Inclusive $B_c$ Decays As A QCD Lab
• The lifetime of B_c-meson and some relevant problems
• Search for $B^0\to {\pi }^{-}{\tau }^{+}{\nu }_{\tau }$ with hadronic tagging at Belle
• The B -> pi tau nu decay in the context of the 2HDM type II
• Impact of leptonic $\tau$ decays on the distribution of $B\to P\mu \bar{\nu }$ decays
• B-Meson Decays into Final States with a tau Lepton

Cited by in corpus (24)

• Scalar contributions to $b\to c(u)\tau \nu$ transitions
• New physics solutions for $R_D$ and $R_{D^{\ast }}$
• LHCb anomaly and $B$ physics in flavored Z${}^{\prime }$ models with flavored Higgs doublets
• \large\bf $B_c\to (J/\Psi ,{\eta }_c)\tau \nu$ semileptonic decays within Standard model and beyond
• Decoding (Pseudo)-Scalar Operators in Leptonic and Semileptonic $B$ Decays
• The role of right-handed neutrinos in $b\to c\tau \bar{\nu }$ anomalies
• Disordered Kitaev chain with long-range pairing: Loschmidt echo revivals and dynamical phase transitions
• Asymmetry Observables and the Origin of $R_{D^{(\ast )}}$ Anomalies
• Investigation of Effects of New Physics in ${\Lambda }_b\to {\Lambda }_c\tau {\bar{\nu }}_{\tau }$ Decay
• Probing New Physics with $\bar{B}\to \rho (770){\ell }^{-}{\bar{\nu }}_{\ell }$ and $\bar{B}\to a_1(1260){\ell }^{-}{\bar{\nu }}_{\ell }$
• Signature of Lepton flavor universality violation in $B_s\to D_s\tau \nu$ semileptonic decays
• ${\epsilon }_K^{\prime }/{\epsilon }_K$ and $K\to \pi \nu \bar{\nu }$ in a two-Higgs doublet model
• Implication of $R_{D^{(\ast )}}$ anomalies on semileptonic decays of ${\Sigma }_b$ and ${\Omega }_b$ baryons
• 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
• Mapping out the Space for New Physics with Leptonic and Semileptonic $B_{(c)}$ Decays
• Impact of vector new physics couplings on $B_s\to (K,K^{\ast })\tau \nu$ and $B\to \pi \tau \nu$ decays
• Implication of $b\to c\tau \nu$ flavor anomalies on $B_s\to D_s^{\ast }\tau \nu$ decay observables
• New physics footprints in the angular distribution of $B_s\to D_s^{\ast }(\to D_s\gamma ,D_s\pi )\tau \nu$ decays
• Probing new physics in semileptonic ${\Sigma }_b$ and ${\Omega }_b$ decays
• $b\to c\tau \bar{\nu }$ decays in supersymmetry with $R$-parity violation
• Predictions of $B_c\to (D,D^{\ast })l\nu$ decay observables in the standard model
• Model independent investigation of rare semileptonic b \to u l \barν_l decay processes
• Implications of new physics in $B\to K_1{\mu }^{+}{\mu }^{-}$ decay processes
• Joint LHCb--Belle II Prospects to Constrain New Physics in $B\to D^{(\ast )}\tau \nu$