Footprints of New Physics in $b\to c\tau \nu$ Transitions

Abstract

In this work, we perform a combined analysis of the $R(D)$, $R(D^{\ast })$, and $R(J/\psi )$ anomalies in a model-independent manner based on the general framework of the four-fermion effective field theory, paying special attention to the use of the hadronic form factors. For the $B\to D(D^{\ast })$ transition form factors, we use the HQET parametrization that includes the higher order corrections of $\mathcal{O}({\alpha }_s,{\Lambda }_{\mathrm{QCD}}/m_{b,c})$ and was determined recently from a fit to lattice QCD and light-cone sum rule results in complementary kinematical regions of the momentum transfer. For the $B_c\to J/\psi ({\eta }_c)$ transitions, we use the form factors calculated in the covariant light-front quark model, which are found to be well consistent with the preliminary lattice results. With this particular treatment of hadronic matrix elements, in our analysis the two classes of vector operators are shown to be the most favored single new physics (NP) operators by the current experimental constraints within $2\sigma$ and the LEP1 data on $Br(B_c\to \tau \nu )$ as well as the minimum ${\chi }^2$ fit, while the tensor operator is also allowed but severely constrained, and the scalar ones are excluded. Using the favored ranges and fitted values of the Wilson coefficients of the single NP operators, we also give a prognosis for the physical observables such as the ratios of decay rates ($R(D(D^{\ast })),R(J/\psi ({\eta }_c))$) and other polarized observables as well as the $q^2$ distributions.

15 pages, 8 figures, accepted for publication in Physical Review D

References in corpus (22)

• 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
• Implications of lepton flavor universality violations in B decays
• The lifetime of the $B_c^{-}$ meson and the anomalies in $B\to D^{(\ast )}\tau \nu$
• New physics in the weak interaction of $\bar{B}\to D^{(\ast )}\tau \bar{\nu }$
• $R(D^{\ast })$, $|V_{cb}|$, and the Heavy Quark Symmetry relations between form factors
• Extraction of $|V_{cb}|$ from $B\to D^{(\ast )}\ell {\nu }_{\ell }$ and the Standard Model predictions of $R(D^{(\ast )})$
• Study of exclusive semileptonic and nonleptonic decays of $B_c^{-}$ in a nonrelativistic quark model
• Weak Decays of Doubly Heavy Baryons: SU(3) Analysis
• Weak Decays of Doubly Heavy Baryons: the $1/2\to 1/2$ case
• New Physics effect on $B_c\to J/\psi \tau \bar{\nu }$ in relation to the $R_{D^{(\ast )}}$ anomaly
• Constraint on the branching ratio of B_c \to tau nu from LEP1 and consequences for R(D(*)) anomaly
• $B\to D^{(\ast )}$ Form Factors from QCD Light-Cone Sum Rules
• 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
• Probing New Physics with $q^2$ distributions in $\bar{B}\to D^{(\ast )}\tau \bar{\nu }$
• 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
• Recent Anomalies in B Physics
• ${\Lambda }_b\to {\Lambda }_c\tau {\bar{\nu }}_{\tau }$ decay in scalar and vector leptoquark scenarios
• Tension in the inclusive versus exclusive determinations of $|V_{cb}|$: a possible role of new physics
• Precise predictions for B -> Xc tau nu decay distributions
• QCD corrections to the $B_c$ to charmonia semi-leptonic decays
• Impact of vector new physics couplings on $B_s\to (K,K^{\ast })\tau \nu$ and $B\to \pi \tau \nu$ decays

Cited by in corpus (72)

• Review of Lepton Universality tests in B decays
• 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"
• Revisiting the new-physics interpretation of the $b\to c\tau \nu$ data
• Addressing $R_{D^{(\ast )}}$, $R_{K^{(\ast )}}$, muon $g-2$ and ANITA anomalies in a minimal $R$-parity violating supersymmetric framework
• $R(J/\psi )$ and $B_c^{-}\to J/\psi {\ell }^{-}{\bar{\nu }}_{\ell }$ Lepton Flavor Universality Violating Observables from Lattice QCD
• Semitauonic $b$-hadron decays: A lepton flavor universality laboratory
• Combined explanations of $(g-2{)}_{\mu }$, $R_{D^{(\ast )}}$, $R_{K^{(\ast )}}$ anomalies in a two-loop radiative neutrino mass model
• $R_2$ as a single leptoquark solution to $R_{D^{(\ast )}}$ and $R_{K^{(\ast )}}$
• B-meson charged current anomalies: the post-Moriond status
• On lepton flavour universality in semileptonic $B_c\to {\eta }_c,J/\psi$ decays
• A Common Origin of Neutrino Masses and $R_{D^{(\ast )}}$, $R_{K^{(\ast )}}$ Anomalies
• $b\to c\tau \nu$ Transitions in the Standard Model Effective Field Theory
• Asymmetry Observables and the Origin of $R_{D^{(\ast )}}$ Anomalies
• 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
• Revisit to the $b\to c\tau \nu$ transition: in and beyond the SM
• Impact of ${\Lambda }_b\to {\Lambda }_c\tau \nu$ measurement on New Physics in $b\to cl\nu$ transitions
• Hidden charm pentaquark states in a diquark model
• Lepton flavor universality violation in semileptonic tree level weak transitions
• Semileptonic decays $B_c\to ({\eta }_c,J/\psi )l{\bar{\nu }}_l$ in the "PQCD + Lattice" approach
• 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
• 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
• Maximizing the Impact of New Physics in $b\to c\tau \nu$ Anomalies
• On the Minimal Flavor Violating Leptoquark Explanation of the $R_{D^{(\ast )}}$ Anomaly
• Investigation of Effects of New Physics in $c\to (s,d){\ell }^{+}{\nu }_{\ell }$ Transitions
• Analysis of $B_c\to \tau {\nu }_{\tau }$ at CEPC
• Model-independent method for measuring the angular coefficients of $B^0\to D^{\ast -}{\tau }^{+}{\nu }_{\tau }$ decays
• Precision Model-Independent Bounds from Global Analysis of $b\to c\ell \nu$ Form Factors
• CP Violation in ${\bar{B}}^0\to D^{\ast +}{\mu }^{-}{\bar{\nu }}_{\mu }$
• Semileptonic decays $B/B_s\to (D^{(\ast )},D_s^{(\ast )})l{\nu }_l$ in the PQCD approach with the lattice QCD input
• Probing flavor constrained SMEFT operators through $tc$ production at the Muon collider
• 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
• Analysing the charged scalar boson contribution to the charged-current $B$ meson anomalies
• Anomalies in B mesons decays: A phenomenological approach
• Testing Leptoquark and $Z^{\prime }$ Models via $B\to K_1(1270,1400){\mu }^{+}{\mu }^{-}$ Decays
• Implication of $R_{D^{(\ast )}}$ anomalies on semileptonic decays of ${\Sigma }_b$ and ${\Omega }_b$ baryons
• Mapping out the Space for New Physics with Leptonic and Semileptonic $B_{(c)}$ Decays
• Marriage between neutrino mass and flavor anomalies
• Scrutinizing New Physics in Semi-leptonic $B_c\to J/\psi \tau \nu$ Decay
• 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
• Measurement of the $D^{\ast }$ longitudinal polarization in $B^0\to D^{\ast -}{\tau }^{+}{\nu }_{\tau }$ decays
• Probing new physics in semileptonic ${\Sigma }_b$ and ${\Omega }_b$ decays
• $D^{\ast }$ Polarization as an Additional Constraint on New Physics in the $b\to c\tau {\bar{\nu }}_{\tau }$ Transition
• Next-to-leading order QCD calculation of $B_c$ to charmonium tensor form factors
• $b\to c\tau \bar{\nu }$ decays in supersymmetry with $R$-parity violation
• Flavor Anomalies Accommodated in A Flavor Gauged Two Higgs Doublet Model
• The ratio $\mathcal{R}(D_s)$ for $B_s\to D_s\ell {\nu }_{\ell }$ by using the QCD light-cone sum rules within the framework of heavy quark effective field theory
• $B_c\to J/\psi$ helicity form factors and the $B_c^{+}\to J/\psi +(P,V,{\ell }^{+}{\nu }_{\ell })$ decays
• New physics in the angular distribution of $B_c^{-}\to J/\psi (\to {\mu }^{+}{\mu }^{-}){\tau }^{-}(\to {\pi }^{-}{\nu }_{\tau }){\bar{\nu }}_{\tau }$ decay
• Baryonic heavy-to-light form factors induced by tensor current in light-front approach
• Analyzing the semileptonic and nonleptonic $B_c\to J/\psi ,{\eta }_c$ decays
• Extra gauge bosons and lepton flavor universality violation in ${\rm Y}$ and $B$ meson decays
• A unique discrimination between new physics scenarios in $b\to s{\mu }^{+}{\mu }^{-}$ anomalies
• $R_{K^{(\ast )}}$ from RPV-SUSY sneutrinos
• Analysis of $b\to c\tau {\bar{\nu }}_{\tau }$ anomalies using weak effective Hamiltonian with complex couplings
• Search for opposite sign muon-tau pair and a b-jet at LHC in the context of flavor anomalies
• Scalar dark matter, Neutrino mass and Leptogenesis in a $\mathrm{U}(1{)}_{\mathrm{B}-\mathrm{L}}$ model
• 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
• Assessing Lepton Flavor Universality Violations in Semileptonic Decays
• $B$ anomalies in the nonminimal universal extra dimension model
• Study of angular observables in exclusive semileptonic $B_c$ decays
• Search for an exotic-leptonic solution to observed anomalies in lepton universality observables in B decays and more
• Effects of vector leptoquarks on ${\Lambda }_b\to {\Lambda }_c\ell {\overline{\nu }}_{\ell }$ decay
• 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
• Probing Higgs and Top Interactions through the Muon Lens at multi-TeV Muon Colliders
• Helicity amplitudes in the $\bar{B}\to D^{\ast }{\bar{\nu }}_{\tau }\tau$ decay with $V-A$ breaking in the quark sector