Scalar contributions to $b\to c(u)\tau \nu$ transitions

Abstract

We perform a comprehensive analysis of scalar contributions in $b\to c\tau \nu$ transitions including the latest measurements of $R(D^{(\ast )})$, the $q^2$ differential distributions in $B\to D^{(\ast )}\tau \nu$, the $\tau$ polarization asymmetry for $B\to D^{\ast }\tau \nu$, and the bound derived from the total width of the $B_c$ meson. We find that scalar contributions with the simultaneous presence of both left- and right-handed couplings to quarks can explain the available data, specifically $R(D^{(\ast )})$ together with the measured differential distributions. However, the constraints from the total $B_c$ width present a slight tension with the current data on $B\to D^{\ast }\tau \nu$ in this scenario, preferring smaller values for $R(D^{\ast })$. We discuss possibilities to disentangle scalar new physics from other new-physics scenarios like the presence of only a left-handed vector current, via additional observables in $B\to D^{(\ast )}\tau \nu$ decays or additional decay modes like the baryonic ${\Lambda }_b\to {\Lambda }_c\tau \nu$ and the inclusive $B\to X_c\tau \nu$ decays. We also analyze scalar contributions in $b\to u\tau \nu$ transitions, including the latest measurements of $B\to \tau \nu$, providing predictions for ${\Lambda }_b\to p\tau \nu$ and $B\to \pi \tau \nu$ decays. The potential complementarity between the $b\to u$ and $b\to c$ sectors is finally investigated once assumptions about the flavour structure of the underlying theory are made.

15 pages, 13 figures and 7 tables. More references and discussions added, Tab. VII updated; final version published in the journal

References in corpus (35)

• Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC
• Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of summer 2016
• Measurement of the $\tau$ lepton polarization and $R(D^{\ast })$ in the decay $\bar{B}\to D^{\ast }{\tau }^{-}{\bar{\nu }}_{\tau }$
• 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
• Confronting lepton flavor universality violation in B decays with high-$p_T$ tau lepton searches at LHC
• Implications of lepton flavor universality violations in B decays
• Simultaneous Explanation of the $R_K$ and $R(D^{(\ast )})$ Puzzles
• The lifetime of the $B_c^{-}$ meson and the anomalies in $B\to D^{(\ast )}\tau \nu$
• New physics in the weak interaction of $\bar{B}\to D^{(\ast )}\tau \bar{\nu }$
• Leptoquark model to explain the $B$-physics anomalies, $R_K$ and $R_D$
• B-decay Anomalies in a Composite Leptoquark Model
• Evidence for B- -> tau- nu_tau-bar with a Hadronic Tagging Method Using the Full Data Sample of Belle
• Leptoquark Flavor Patterns & B Decay Anomalies
• Lepton universality violation and lepton flavor conservation in $B$-meson decays
• $B\to \pi \ell {\nu }_l$ Width and $|V_{ub}|$ from QCD Light-Cone Sum Rules
• B -> D tau nu Branching Ratios: Opportunity for Lattice QCD and Hadron Colliders
• $B\to \pi \ell \nu$ and $B_s\to K\ell \nu$ form factors and $|V_{ub}|$ from 2+1-flavor lattice QCD with domain-wall light quarks and relativistic heavy quarks
• B-meson decay constants: a more complete picture from full lattice QCD
• Charged-Higgs effects in a new B -> D tau nu differential decay distribution
• Explaining the $R_K$ and $R_{D^{(\ast )}}$ anomalies with vector leptoquarks
• ${\Lambda }_b\to {\Lambda }_c\tau {\bar{\nu }}_{\tau }$ 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
• New Physics in the Visible Final States of $B\to D^{(\ast )}\tau \nu$
• The Azimuthal $B\to D^{\ast }{\tau }^{-}\overline{{\nu }_{\tau }}$ Angular Distribution with Tensor Operators
• 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 $b\to s{\mu }^{+}{\mu }^{-}$
• Charged Higgs on $B^{-}\to \tau {\bar{\nu }}_{\tau }$ and $\bar{B}\to P(V)\ell {\bar{\nu }}_{\ell }$
• Extrapolation and unitarity bounds for the $B\to \pi$ form factor
• ${\Lambda }_b\to {\Lambda }_c\tau {\bar{\nu }}_{\tau }$ decay in scalar and vector leptoquark scenarios
• Precise predictions for B -> Xc tau nu decay distributions
• CP violation in $B\to D\tau {\nu }_{\tau }$ using multi-pion tau decays
• Remarks on the Standard Model predictions for $R(D)$ and $R(D^{\ast })$
• Probing a pseudoscalar at the LHC in light of $R(D^{(\ast )})$ and muon g-2 excesses

Cited by in corpus (119)

• Patterns of New Physics in $b\to s{\ell }^{+}{\ell }^{-}$ transitions in the light of recent data
• Simultaneous Explanation of $R(D^{(\ast )})$ and $b\to s{\mu }^{+}{\mu }^{-}$: The Last Scalar Leptoquarks Standing
• Closing the window on single leptoquark solutions to the $B$-physics anomalies
• A model of vector leptoquarks in view of the $B$-physics anomalies
• 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
• Review of Lepton Universality tests in B decays
• Renormalization-group evolution of new physics contributions to (semi)leptonic meson decays
• $R_{D^{(\ast )}}$ anomaly: A possible hint for natural supersymmetry with $R$-parity violation
• On the single leptoquark solutions to the $B$-physics anomalies
• $R(D^{(\ast )})$ in a general two Higgs doublet model
• A Global Likelihood for Precision Constraints and Flavour Anomalies
• New Physics effect on $B_c\to J/\psi \tau \bar{\nu }$ in relation to the $R_{D^{(\ast )}}$ anomaly
• The Mono-Tau Menace: From $B$ Decays to High-$p_T$ Tails
• Global fit to $b\to c\tau \nu$ transitions
• Impact of polarization observables and $B_c\to \tau \nu$ on new physics explanations of the $b\to c\tau \nu$ anomaly
• Searching for New Physics with $b\to s{\tau }^{+}{\tau }^{-}$ processes
• Constraint on the branching ratio of B_c \to tau nu from LEP1 and consequences for R(D(*)) anomaly
• Low-energy signatures of the ${\mathrm{PS}}^3$ model: from $B$-physics anomalies to LFV
• On the Importance of Electroweak Corrections for B Anomalies
• Phenomenology of ${\Lambda }_b\to {\Lambda }_c\tau {\bar{\nu }}_{\tau }$ using lattice QCD calculations
• Addendum to "Impact of polarization observables and $B_c\to \tau \nu$ on new physics explanations of the $b\to c\tau \nu$ anomaly"
• Constraining new physics in $b\to c\ell \nu$ transitions
• Footprints of New Physics in $b\to c\tau \nu$ Transitions
• With or without U(2)? Probing non-standard flavor and helicity structures in semileptonic B decays
• Lepton-flavor universality violation in $R_K$ and $R_{D^{(\ast )}}$ from warped space
• New physics solutions for $R_D$ and $R_{D^{\ast }}$
• It's all right(-handed neutrinos): a new $W^{\prime }$ model for the $R_{D^{(\ast )}}$ anomaly
• Lepton universality violation and right-handed currents in $b\to c\tau \nu$
• LHCb anomaly and $B$ physics in flavored Z${}^{\prime }$ models with flavored Higgs doublets
• $b\to s{\ell }^{+}{\ell }^{-}$ Transitions in Two-Higgs-Doublet Models
• Addressing $R_{D^{(\ast )}}$, $R_{K^{(\ast )}}$, muon $g-2$ and ANITA anomalies in a minimal $R$-parity violating supersymmetric framework
• Revisiting the new-physics interpretation of the $b\to c\tau \nu$ data
• $R(D^{(\ast )})$ from $W^{\prime }$ and right-handed neutrinos
• Perturbative corrections to $B\to D$ form factors in QCD
• $D^{\ast }$ polarization vs. $R_{D^{(\ast )}}$ anomalies in the leptoquark models
• Challenges in Semileptonic B Decays
• Anatomy of $b\to c\tau \nu$ anomalies
• \large\bf $B_c\to (J/\Psi ,{\eta }_c)\tau \nu$ semileptonic decays within Standard model and beyond
• Implications of scalar and tensor explanations of $R_{D^{(\ast )}}$
• $b\to c\tau {\nu }_{\tau }$ Decays: A Catalogue to Compare, Constrain, and Correlate New Physics Effects
• Revisiting R-parity violating interactions as an explanation of the B-physics anomalies
• The role of right-handed neutrinos in $b\to c\tau \bar{\nu }$ anomalies
• Unveiling Hidden Physics at the LHC
• Unified explanation of flavor anomalies, radiative neutrino mass and ANITA anomalous events in a vector leptoquark model
• Flavour alignment in multi-Higgs-doublet models
• Right-handed Neutrinos and $R(D^{(\ast )})$
• Asymmetry Observables and the Origin of $R_{D^{(\ast )}}$ Anomalies
• $b\to c\tau \nu$ 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
• Revisit to the $b\to c\tau \nu$ transition: in and beyond the SM
• 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
• $R_{D^{(\ast )}}$, $R_{K^{(\ast )}}$ and neutrino mass in the 2HDM-III with right-handed neutrinos
• Global fits in the Aligned Two-Higgs-Doublet model
• Inclusive Semitauonic $B$ Decays to Order $\mathcal{O}({\Lambda }_{QCD}^3/m_b^3)$
• Probing a simplified, $W^{\prime }$ model of $R(D^{(\ast )})$ anomalies using $b$-tags, $\tau$ leptons and missing energy
• Correlating Tauonic B Decays to the Neutron EDM via a Scalar Leptoquark
• Beyond $\mathcal{R}(D^{(\ast )})$ with the general 2HDM-III for $b\to c\tau \nu$
• Global fit to $b\to c\tau \nu$ anomalies as of Spring 2024
• Phenomenology of $b\to c\tau \bar{\nu }$ decays in a scalar leptoquark model
• $B\to D\ell {\nu }_{\ell }$ form factors beyond leading power and extraction of $|V_{cb}|$ and $R(D)$
• Probing New Physics with $\bar{B}\to \rho (770){\ell }^{-}{\bar{\nu }}_{\ell }$ and $\bar{B}\to a_1(1260){\ell }^{-}{\bar{\nu }}_{\ell }$
• R-parity violating solutions to the $R_{D^{(\ast )}}$ anomaly and their GUT-scale unifications
• On the Minimal Flavor Violating Leptoquark Explanation of the $R_{D^{(\ast )}}$ Anomaly
• Review of Semileptonic $B$ Anomalies
• Maximizing the Impact of New Physics in $b\to c\tau \nu$ Anomalies
• ${\rm Y}$ and $\psi$ leptonic decays as probes of solutions to the $R_D^{(\ast )}$ puzzle
• Investigation of Effects of New Physics in $c\to (s,d){\ell }^{+}{\nu }_{\ell }$ Transitions
• Common explanation to the $R_{K^{(\ast )}}$, $R_{D^{(\ast )}}$ and ${\epsilon }^{\prime }/\epsilon$ anomalies in a 3HDM+${\nu }_R$ and connections to neutrino physics
• CP-Violation in the Two Higgs Doublet Model: from the LHC to EDMs
• CP Violation in ${\bar{B}}^0\to D^{\ast +}{\mu }^{-}{\bar{\nu }}_{\mu }$
• A Measurable Angular Distribution for $\bar{B}\to D^{\ast }{\tau }^{-}{\bar{\nu }}_{\tau }$ Decays
• Signature of Lepton flavor universality violation in $B_s\to D_s\tau \nu$ semileptonic decays
• Revival of $H^{-}$ interpretation of $R_{D^{(\ast )}}$ anomaly and closing low mass window
• 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
• 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
• Lepton Flavor Universality tests through angular observables of $\overline{B}\to D^{(\ast )}\ell \overline{\nu }$ decay modes
• Amplitude analysis of the ${\Lambda }_c^{+}\to p{K}^{-}{\pi }^{+}$ decay and ${\Lambda }_c^{+}$ baryon polarization measurement in semileptonic beauty hadron decays
• $b\to c\ell \nu$ anomalies in light of extended scalar sectors
• Analysing the charged scalar boson contribution to the charged-current $B$ meson anomalies
• Coup de grace to the charged Higgs solution of $P_5^{\prime }$ and $R_{D^{(\ast )}}$ discrepancies
• New physics in inclusive semileptonic $B$ decays including nonperturbative corrections
• LHC bounds on coloured scalars
• Anomalies in B mesons decays: A phenomenological approach
• Phenomenology of TeV-scale scalar Leptoquarks in the EFT
• On Lepton Flavor Universality in Top Quark Decays
• PSI/UZH Workshop: Impact of $B\to {\mu }^{+}{\mu }^{-}$ on New Physics Searches
• On sum rules for semi-leptonic $b\to c$ and $b\to u$ 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 $R(J/\psi )$
• $b\to c\tau \bar{\nu }$ decays in supersymmetry with $R$-parity violation
• Probing New Physics Signals with Symmetry-Restored Yukawa Textures
• Clustering of $\bar{B}\to D^{(\ast )}{\tau }^{-}{\bar{\nu }}_{\tau }$ kinematic distributions with ClusterKinG
• Leptoquarks in Flavour Physics
• Interplay of the charged Higgs effects in $R_{D^{(\ast )}}$, $b\to s{\ell }^{+}{\ell }^{-}$ and $W$-mass
• Predictions of $B_c\to (D,D^{\ast })l\nu$ decay observables in the standard model
• New physics contributions to moments of inclusive $b\to c$ semileptonic decays
• Probing New Physics in light of recent developments in $b\to c\ell \nu$ transitions
• New physics in the angular distribution of $B_c^{-}\to J/\psi (\to {\mu }^{+}{\mu }^{-}){\tau }^{-}(\to {\pi }^{-}{\nu }_{\tau }){\bar{\nu }}_{\tau }$ decay
• $B_c^{-}\to J/\psi (\to {\mu }^{+}{\mu }^{-}){\tau }^{-}(\to {\pi }^{-}{\nu }_{\tau },{\rho }^{-}{\nu }_{\tau },{\ell }^{-}{\bar{\nu }}_{\ell }{\nu }_{\tau }){\bar{\nu }}_{\tau }$ decays with visible final-state kinematics
• 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
• Singlet vector leptoquark model facing recent LHCb and BABAR measurements
• Measurement of the ratio of branching fractions $\mathcal{B}(B_c^{+}\to B_s^0{\pi }^{+})/\mathcal{B}(B_c^{+}\to J/\psi {\pi }^{+})$
• Relations between $b\to c\tau \nu$ Decay Modes in Scalar Models
• Analysis of $b\to c\tau {\bar{\nu }}_{\tau }$ anomalies using weak effective Hamiltonian with complex couplings
• Lepton Flavor Violating $B\to K_2^{\ast }(1430){\mu }^{\pm }{\tau }^{\mp }$ Decays
• Flavour anomalies and dark matter assisted unification in $SO(10)$ GUT
• TeV-scale vector leptoquark from Pati-Salam unification with vectorlike families
• Probing the R-parity violating supersymmetric effects in $B_c\to J/\psi {\ell }^{-}{\bar{\nu }}_{\ell },{\eta }_c{\ell }^{-}{\bar{\nu }}_{\ell }$ and ${\Lambda }_b\to {\Lambda }_c{\ell }^{-}{\bar{\nu }}_{\ell }$ decays
• $b\to c\tau {\bar{\nu }}_{e,\mu }$ contributions to $R(D^{(\ast )})$
• Explaining the $\mathcal{R}(D)$ and $\mathcal{R}(D^{\ast })$ Anomalies in the $B-L$ Supersymmetric Standard Model with Inverse Seesaw
• Flavour Physics from Present to Future Colliders
• 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
• Theoretical implications of recent heavy flavour measurements at the LHC
• 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
• Explaining lepton-flavor non-universality and self-interacting dark matter with $L_{\mu }-L_{\tau }$
• Flavor Anomalies and Quark-Lepton Unification