Optimal-observable analysis of possible new physics in $B\to D^{(\ast )}\tau {\nu }_{\tau }$

Abstract

We study all possible observables in $B\to D^{(\ast )}\tau {\nu }_{\tau }$ with new physics (NP), including new vector, scalar and tensor interactions, and investigate the prospects of extracting NP Wilson coefficients with optimal observables. Analysis of the full $q^2$ integrated branching fractions of $B\to D^{(\ast )}\tau {\nu }_{\tau }$ show that the overall sensitivity of the observables of $B\to D\tau {\nu }_{\tau }$ is more towards the scalar current, whereas the bin-by-bin analysis of $q^2$ distribution of the differential branching fraction points to regions of $q^2$ sensitive to tensor interactions. Interestingly, the observables in $B\to D^{\ast }\tau {\nu }_{\tau }$ are more sensitive to tensor interactions, and bin-by-bin analysis of this mode shows the distinct regions of $q^2$ sensitive to vector or scalar interactions. In addition to that, the $\tau$ polarisation asymmetry is found to be more sensitive to NP compared to the other observables, in both decay modes.

13 pages, 26 figures, version accepted for publication in PRD

References in corpus (7)

• 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
• Flavor models for $\bar{B}\to D^{(\ast )}\tau \bar{\nu }$
• New physics in the weak interaction of $\bar{B}\to D^{(\ast )}\tau \bar{\nu }$
• The Azimuthal $B\to D^{\ast }{\tau }^{-}\overline{{\nu }_{\tau }}$ Angular Distribution with Tensor Operators
• Probing New Physics with $q^2$ distributions in $\bar{B}\to D^{(\ast )}\tau \bar{\nu }$

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• Scalar contributions to $b\to c(u)\tau \nu$ transitions
• $R_{D^{(\ast )}}$ anomaly: A possible hint for natural supersymmetry with $R$-parity violation
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• Explaining the $R_K$ and $R_{D^{(\ast )}}$ anomalies with vector leptoquarks
• The role of the $S_3$ GUT leptoquark in flavor universality and collider searches
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• New Physics in the Visible Final States of $B\to D^{(\ast )}\tau \nu$
• D* polarization as a probe to discriminate new physics in B --> D* tau nubar
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• Charged-Higgs on $R_{D^{(\ast )}}$, $\tau$ polarization, and FBA
• 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
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• LHC constraints and prospects for $S_1$ scalar leptoquark explaining the $\bar{B}\to D^{(\ast )}\tau \bar{\nu }$ anomaly
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• Anomalies in (semi)-leptonic $B$ decays $B^{\pm }\to {\tau }^{\pm }\nu$, $B^{\pm }\to D{\tau }^{\pm }\nu$ and $B^{\pm }\to D^{\ast }{\tau }^{\pm }\nu$, and possible resolution with sterile neutrino
• 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
• R-parity violating solutions to the $R_{D^{(\ast )}}$ anomaly and their GUT-scale unifications
• CP Violation in ${\bar{B}}^0\to D^{\ast +}{\mu }^{-}{\bar{\nu }}_{\mu }$
• Probing anomalous $ZZ\gamma$ and $Z\gamma \gamma$ Couplings at the $e^{+}{e}^{-}$ Colliders using Optimal Observable Technique
• Precision Model-Independent Bounds from Global Analysis of $b\to c\ell \nu$ Form Factors
• Semileptonic decays $B/B_s\to (D^{(\ast )},D_s^{(\ast )})l{\nu }_l$ in the PQCD approach with the lattice QCD input
• Probing heavy charged fermions at $e^{+}{e}^{-}$ collider using the Optimal Observable Technique
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• Optimal estimation of Dimension-8 Neutral Triple Gauge Couplings at $e^{+}{e}^{-}$ Colliders
• Lepton Flavor Universality tests through angular observables of $\overline{B}\to D^{(\ast )}\ell \overline{\nu }$ decay modes
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• Study of semileptonic ${\bar{B}}^{\ast }\to P\ell {\bar{\nu }}_{\ell }$ decays
• Remarks on the Standard Model predictions for $R(D)$ and $R(D^{\ast })$
• Unified resolution of the $R(D)$ and $R(D^{\ast })$ anomalies and the lepton flavor violating decay $h\to \mu \tau$
• 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
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• Optimal observable analysis for the decay $b\to s$ plus missing energy
• Exploring Optimal Sensitivity of Lepton Flavor Violating Effective Couplings at the $e^{+}{e}^{-}$ Colliders