Semileptonic tau decays beyond the Standard Model

Abstract

Hadronic $\tau$ decays are studied as probe of new physics. We determine the dependence of several inclusive and exclusive $\tau$ observables on the Wilson coefficients of the low-energy effective theory describing charged-current interactions between light quarks and leptons. The analysis includes both strange and non-strange decay channels. The main result is the likelihood function for the Wilson coefficients in the tau sector, based on the up-to-date experimental measurements and state-of-the-art theoretical techniques. The likelihood can be readily combined with inputs from other low-energy precision observables. We discuss a combination with nuclear beta, baryon, pion, and kaon decay data. In particular, we provide a comprehensive and model-independent description of the new physics hints in the combined dataset, which are known under the name of the Cabibbo anomaly.

58 pages; V2: Table 1 added, final published version

References in corpus (36)

• The $g-2$ of charged leptons, $\alpha (M_Z^2)$ and the hyperfine splitting of muonium
• Renormalization-group evolution of new physics contributions to (semi)leptonic meson decays
• High-precision quark masses and QCD coupling from $n_f=4$ lattice QCD
• The Standard Model prediction for R_{e/mu}^{(pi,K)}
• On the single leptoquark solutions to the $B$-physics anomalies
• alpha_s and the tau hadronic width: fixed-order, contour-improved and higher-order perturbation theory
• The Determination of alpha_s from Tau Decays Revisited
• The strong coupling from the revised ALEPH data for hadronic $\tau$ decays
• Form Factors in the radiative pion decay
• Comprehensive analysis of beta decays within and beyond the Standard Model
• A note on isospin violation in Pl2(gamma) decays
• The ratio FK/Fpi in QCD
• The Fermi constant from muon decay versus electroweak fits and CKM unitarity
• The Realistic Lattice Determination of alpha_s(M_Z) Revisited
• Short-distance HLbL contributions to the muon anomalous magnetic moment beyond perturbation theory
• Perturbative expansion of the QCD Adler function improved by renormalization-group summation and analytic continuation in the Borel plane
• New $\tau$-based evaluation of the hadronic contribution to the vacuum polarization piece of the muon anomalous magnetic moment
• Reactor neutrino oscillations as constraints on Effective Field Theory
• The strong coupling from an improved $\tau$ vector isovector spectral function
• Dispersion relation analysis of the radiative corrections to $g_A$ in the neutron $\beta$-decay
• Tests of non-standard electroweak couplings of right-handed quarks
• $F_K/F_{\pi }$ from Möbius domain-wall fermions solved on gradient-flowed HISQ ensembles
• Novel patterns for vector mesons from the large-Nc limit
• Modified Contour-Improved Perturbation Theory
• Complete theory of radiative corrections to $K_{\ell 3}$ decays and the $V_{us}$ update
• Measurement of the neutron decay electron-antineutrino angular correlation by the aCORN experiment
• Effective-field theory analysis of the ${\tau }^{-}\to {\eta }^{(\prime )}{\pi }^{-}{\nu }_{\tau }$ decays
• On the Difference between FOPT and CIPT for Hadronic Tau Decays
• Precision physics with inclusive QCD processes
• Conformal mapping of the Borel plane: going beyond perturbative QCD
• Flavour breaking effects in the pseudoscalar meson decay constants
• Determination of perturbative QCD coupling from ALEPH $\tau$ decay data using pinched Borel-Laplace and Finite Energy Sum Rules
• A Combined NNLO Lattice-Continuum Determination of $L_{10}^r$
• SU(3) analysis of four-quark operators: $K\to \pi \pi$ and vacuum matrix elements
• OPE-RchiT matching at order alpha_s: hard gluonic corrections to three-point Green functions
• Semileptonic $\tau$ decays: powerful probes of non-standard charged current weak interactions

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• Constraints on subleading interactions in beta decay Lagrangian
• On the sensitivity of the D parameter to new physics
• Precision pulse shape simulation for proton detection at the Nab experiment
• Fill and dump measurement of the neutron lifetime using an asymmetric magneto-gravitational trap