Anatomy of $b\to c\tau \nu$ anomalies

Abstract

In recent times, one of the strongest hints of Physics Beyond the Standard Model (BSM) has been the anomaly in the ratios $R_D$ and $R_{D^{\ast }}$ measured in the charged current decays of $B$-mesons. In this work, we perform a comprehensive analysis of these decay modes, first in a model independent way and subsequently, in the context of composite Higgs models. We discuss in depth as to how linearly realised $\mathrm{SU}(2{)}_{\mathrm{L}}\times \mathrm{U}(1{)}_{\mathrm{Y}}$ symmetry imposes severe constraint on the various scenarios because of correlations with other $\Delta F=1$ processes and $Z\tau \tau$ and $Z\nu \nu$ couplings. In the composite Higgs paradigm with partial compositeness, we show that, irrespective of the flavour structure of the composite sector, constraints from $\Delta F=2$ processes bring the compositeness scale down to $\sim 650$ GeV which is in tension with electroweak precision observables. In the presence of composite leptoquarks, the situation improves only marginally (a factor of $\sqrt{2}$ in the compositeness scale), thus making the new states soon discoverable by direct searches at the LHC. We also comment on the possible explanation of the $R_{K,K^{\ast }}$ anomalies within the composite Higgs framework.

arXiv commentPublished version

References in corpus (56)

• Dimension-Six Terms in the Standard Model Lagrangian
• Renormalization Group Evolution of the Standard Model Dimension Six Operators III: Gauge Coupling Dependence and Phenomenology
• Renormalization Group Evolution of the Standard Model Dimension Six Operators II: Yukawa Dependence
• Higgs as a Holographic Pseudo-Goldstone Boson
• A custodial symmetry for Zbb
• The global electroweak fit at NNLO and prospects for the LHC and ILC
• Model-independent constraints on Delta F=2 operators and the scale of New Physics
• B-physics anomalies: a guide to combined explanations
• Weak form factors for heavy meson decays: an update
• Dispersive Bounds on the Shape of B -> D^(*) l nu Form Factors
• 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
• The Flavor of the Composite Pseudo-Goldstone Higgs
• Anomalies in $B$-decays and $U(2)$ flavour symmetry
• Flavour anomalies after the $R_{K^{\ast }}$ measurement
• A three-site gauge model for flavor hierarchies and flavor anomalies
• Precision Tau Physics
• Confronting lepton flavor universality violation in B decays with high-$p_T$ tau lepton searches at LHC
• Warped/Composite Phenomenology Simplified
• U(2) and Minimal Flavour Violation in Supersymmetry
• Simultaneous Explanation of the $R_K$ and $R(D^{(\ast )})$ Puzzles
• The lifetime of the $B_c^{-}$ meson and the anomalies in $B\to D^{(\ast )}\tau \nu$
• $B\to Dl\nu$ Form Factors at Non-Zero Recoil and Extraction of $|V_{cb}|$
• On the effect of resonances in composite Higgs phenomenology
• $R(D^{\ast })$, $|V_{cb}|$, and the Heavy Quark Symmetry relations between form factors
• Revisiting Lepton Flavour Universality in B Decays
• B-decay Anomalies in a Composite Leptoquark Model
• Scalar contributions to $b\to c(u)\tau \nu$ transitions
• Electroweak Precision Observables, New Physics and the Nature of a 126 GeV Higgs Boson
• Light top partners and precision physics
• Electroweak precision observables and Higgs-boson signal strengths in the Standard Model and beyond: present and future
• Minimally flavored colored scalar in $\bar{B}\to D^{(\ast )}\tau \bar{\nu }$ and the mass matrices constraints
• B-meson decay constants: a more complete picture from full lattice QCD
• New Physics effect on $B_c\to J/\psi \tau \bar{\nu }$ in relation to the $R_{D^{(\ast )}}$ anomaly
• Flavor and CP Invariant Composite Higgs Models
• Searching for New Physics with $b\to s{\tau }^{+}{\tau }^{-}$ processes
• On the Importance of Electroweak Corrections for B Anomalies
• Addressing the B-physics anomalies in a fundamental Composite Higgs Model
• B-decay anomalies in Pati-Salam SU(4)
• Explaining the $R_K$ and $R_{K^{\ast }}$ anomalies
• The Full $B\to D^{\ast }{\tau }^{-}\overline{{\nu }_{\tau }}$ Angular Distribution and CP violating Triple Products
• A Natural origin for the LHCb anomalies
• It's all right(-handed neutrinos): a new $W^{\prime }$ model for the $R_{D^{(\ast )}}$ anomaly
• B-physics from Nf=2 tmQCD: the Standard Model and beyond
• Role of Tensor operators in $R_K$ and $R_{K^{\ast }}$
• A 125 GeV composite Higgs boson versus flavour and electroweak precision tests
• A closer look at the $R_D$ and $R_{D^{\ast }}$ anomalies
• New Physics in the Visible Final States of $B\to D^{(\ast )}\tau \nu$
• $R(D^{(\ast )})$ from $W^{\prime }$ and right-handed neutrinos
• Direct and indirect signals of natural composite Higgs models
• Minimal unified resolution to $R_{K^{(\ast )}}$ and $R(D^{(\ast )})$ anomalies with lepton mixing
• Toward a coherent solution of diphoton and flavor anomalies
• Extending the Analysis of Electroweak Precision Constraints in Composite Higgs Models
• Resolving gluon fusion loops at current and future hadron colliders
• Electroweak symmetry breaking and collider signatures in the next-to-minimal composite Higgs model
• Flavour issues in warped custodial models: $B$ anomalies and rare $K$ decays

Cited by in corpus (50)

• 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
• Low-energy phenomenology of scalar leptoquarks at one-loop accuracy
• Revisiting the new-physics interpretation of the $b\to c\tau \nu$ data
• Correlating $h\to {\mu }^{+}{\mu }^{-}$ to the Anomalous Magnetic Moment of the Muon via Leptoquarks
• Combined explanations of $(g-2{)}_{\mu }$, $R_{D^{(\ast )}}$, $R_{K^{(\ast )}}$ anomalies in a two-loop radiative neutrino mass model
• A near-minimal leptoquark model for reconciling flavour anomalies and generating radiative neutrino masses
• $R_2$ as a single leptoquark solution to $R_{D^{(\ast )}}$ and $R_{K^{(\ast )}}$
• QCD Improved Matching for Semi-Leptonic B Decays with Leptoquarks
• Combined Constraints on First Generation Leptoquarks
• $b\to c\tau {\nu }_{\tau }$ Decays: A Catalogue to Compare, Constrain, and Correlate New Physics Effects
• Scalar Leptoquarks in Leptonic Processes
• B-meson charged current anomalies: the post-Moriond status
• New physics in $B$ meson mixing: future sensitivity and limitations
• A Common Origin of Neutrino Masses and $R_{D^{(\ast )}}$, $R_{K^{(\ast )}}$ Anomalies
• Unitarity Bounds for Semileptonic Decays in Lattice QCD
• Asymmetry Observables and the Origin of $R_{D^{(\ast )}}$ Anomalies
• Test of the $R(D^{(\ast )})$ anomaly at the LHC
• Investigation of Effects of New Physics in ${\Lambda }_b\to {\Lambda }_c\tau {\bar{\nu }}_{\tau }$ Decay
• Charged current $b\to c\tau {\bar{\nu }}_{\tau }$ anomalies in a general $W^{\prime }$ boson scenario
• Impact of ${\Lambda }_b\to {\Lambda }_c\tau \nu$ measurement on New Physics in $b\to cl\nu$ transitions
• Constraints for the semileptonic $B\to D^{(\ast )}$ form factors from lattice QCD simulations of two-point correlation functions
• Leptoquarks in Oblique Corrections and Higgs Signal Strength: Status and Prospects
• Das ist der HAMMER: Consistent new physics interpretations of semileptonic decays
• Complete Lagrangian and Set of Feynman Rules for Scalar Leptoquarks
• Correlating Tauonic B Decays to the Neutron EDM via a Scalar Leptoquark
• R-parity violating solutions to the $R_{D^{(\ast )}}$ anomaly and their GUT-scale unifications
• Maximizing the Impact of New Physics in $b\to c\tau \nu$ Anomalies
• The Forward-Backward Asymmetry in $B\to D^{\ast }\ell \nu$: One more hint for Scalar Leptoquarks?
• 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
• Discriminating $B\to D^{\ast }\ell \nu$ form factors via polarization observables and asymmetries
• A model for the Singlet-Triplet Leptoquarks
• 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
• $B$ anomalies under the lens of electroweak precision
• Anomalies in B mesons decays: A phenomenological approach
• Implication of $R_{D^{(\ast )}}$ anomalies on semileptonic decays of ${\Sigma }_b$ and ${\Omega }_b$ baryons
• Marriage between neutrino mass and flavor anomalies
• Consequences of $b\to s{\mu }^{+}{\mu }^{-}$ anomalies on $B\to K^{(\ast )}\nu \bar{\nu }$, $B_s\to (\eta ,{\eta }^{\prime })\nu \bar{\nu }$ and $B_s\to \varphi \nu \bar{\nu }$ decay observables
• Addendum to: Combined Constraints on First Generation Leptoquarks
• Next-to-Leading-Order QCD Matching for $\Delta F=2$ Processes in Scalar Leptoquark Models
• 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
• Analyzing the semileptonic and nonleptonic $B_c\to J/\psi ,{\eta }_c$ decays
• Relations between $b\to c\tau \nu$ Decay Modes in Scalar Models
• 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
• Testing Lepton Flavor Universality at the Electron-Ion Collider
• Rare decay $t\to c\gamma \gamma$ via scalar leptoquark doublets
• Explaining the hints for lepton flavour universality violation with three $S_2$ leptoquark generations