Hadronic 
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 Decays as New Physics Probes in the LHC Era

Cirigliano, Vincenzo; Falkowski, Adam; González–Alonso, Martín; Rodríguez-Sánchez, Antonio

doi:10.1103/physrevlett.122.221801

Cited by 90 publications

(82 citation statements)

References 85 publications

(147 reference statements)

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“…Our results are in accord with those of [36] 11 , which were obtained through a combination of inclusive and exclusive (strangeness-conserving) tau decays, but for the limit on the coefficient . Ours is much weaker, but still compatible within errors with, the bounds set in [34,36], since we are not using the − → − decay in the global fit for lack of experimental measurements. The differing bound on obtained with and without the mode increases the interest of its measurement and demands improved theoretical understanding accordingly.…”

Section: New Physics Bounds From δ = 0 Decayssupporting

confidence: 91%

“…We can anticipate that the bounds for the NP couplings that we get in this work (in the MS scheme at scale = 2 GeV), obtained from all data available on exclusive decays only, are competitive and found to be in line with those of Ref. [36], which were obtained analyzing data including both exclusive and inclusive decays. This agreement represents a good consistency test between exclusive and inclusive determinations.…”

Section: Introductionsupporting

confidence: 81%

“…The central value in Eq. (10) shows a slight difference with respect to the result of [36], (−0.15 ± 0.67) × 10 −2 , that we may attribute to a different numerical input. We next perform a simultaneous fit to one and two meson strangeness-conserving exclusive hadronic tau decays.…”

Section: New Physics Bounds From δ = 0 Decaysmentioning

confidence: 76%

“…Several recent works [34,35,36,37,38] have put forward that semileptonic tau decays are not only a clean QCD laboratory but also offer an interesting scenario to set bounds on non-standard weak charged current interactions complementary to the traditional low-energy semileptonic probes such nuclear beta decays, purely leptonic lepton, pion and kaon decays or hyperon decays (see e.g. Refs.…”

Section: Introductionmentioning

confidence: 99%

“…[38] and − → − (′) [34], carried out using the lowenergy limit of the Standard Model Effective Field Theory Lagrangian (SMEFT) [51,52] up to dimension six, to a global analysis of the strangeness-conserving (Δ =0) and strangenesschanging (|Δ |=1) semileptonic exclusive tau decays into one and two pseudoscalar mesons . The main advantage of this EFT framework is that experimental measurements and their implications for New Physics can be compared unambiguously either at low energies or at the high LHC energies in a model-independent way [36].…”

Section: Introductionmentioning

confidence: 99%

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Exclusive hadronic tau decays as probes of non-SM interactions

et al. 2020

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A B S T R A C TWe perform a global analysis of exclusive hadronic tau decays into one and two mesons using the lowenergy limit of the Standard Model Effective Field Theory up to dimension six, assuming left-handed neutrinos. A controlled theoretical input on the Standard Model hadronic form factors, based on chiral symmetry, dispersion relations, data and asymptotic QCD properties, has allowed us to set bounds on the New Physics effective couplings using the present experimental data. Our results highlight the importance of semileptonic decays in complementing the traditional low-energy probes, such nuclear decays or semileptonic pion and kaon decays, and the high-energy measurements at LHC scales. This makes yet another reason for considering hadronic tau decays as golden modes at Belle-II.

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Section: New Physics Bounds From δ = 0 Decayssupporting

confidence: 91%

Section: Introductionsupporting

confidence: 81%

Section: New Physics Bounds From δ = 0 Decaysmentioning

confidence: 76%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Exclusive hadronic tau decays as probes of non-SM interactions

et al. 2020

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CP asymmetry in the angular distributions of τ → KSπντ decays. Part II. General effective field theory analysis

Chen

Peng

et al. 2022

J. High Energ. Phys.

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In this work, we proceed to study the CP asymmetry in the angular distributions of τ → KSπντ decays within a general effective field theory framework including four-fermion operators up to dimension-six. It is found that, besides the commonly considered scalar-vector interference, the tensor-scalar interference can also produce a non-zero CP asymmetry in the angular distributions, in the presence of complex couplings. Using the dispersive representations of the Kπ form factors as inputs, and taking into account the detector efficiencies of the Belle measurement, we firstly update our previous SM predictions for the CP asymmetries in the same four Kπ invariant-mass bins as set by the Belle collaboration. Bounds on the effective couplings of the non-standard scalar and tensor interactions are then obtained under the combined constraints from the CP asymmetries measured in the four bins and the branching ratio of τ−→ KSπ−ντ decay, with the numerical results given respectively by $$ \operatorname{Im}\left[{\hat{\upepsilon}}_S\right] $$ Im ϵ ̂ S = −0.008 ± 0.027 and $$ \operatorname{Im}\left[{\hat{\upepsilon}}_T\right] $$ Im ϵ ̂ T = 0.03 ± 0.12, at the renormalization scale μτ = 2 GeV in the $$ \overline{\mathrm{MS}} $$ MS ¯ scheme. Using the best-fit values, we also find that the distributions of the CP asymmetries can deviate significantly from the SM expectation in almost the whole Kπ invariant-mass region. Nevertheless, the current bounds on $$ \operatorname{Im}\left[{\hat{\upepsilon}}_S\right] $$ Im ϵ ̂ S and $$ \operatorname{Im}\left[{\hat{\upepsilon}}_T\right] $$ Im ϵ ̂ T are still plagued by large experimental uncertainties, but will be improved with more precise measurements from the Belle II experiment as well as the proposed Tera-Z and STCF facilities. Assuming further that the non-standard scalar and tensor interactions originate from a weakly-coupled heavy new physics well above the electroweak scale, the SU(2)L invariance of the resulting SMEFT Lagrangian would indicate that very strong limits on $$ \operatorname{Im}\left[{\hat{\upepsilon}}_S\right] $$ Im ϵ ̂ S and $$ \operatorname{Im}\left[{\hat{\upepsilon}}_T\right] $$ Im ϵ ̂ T could also be obtained from the neutron electric dipole moment and the $$ {D}^0-{\overline{D}}^0 $$ D 0 − D ¯ 0 mixing. With the bounds from these processes taken into account, it is then found that, unless there exist extraordinary cancellations between the new physics contributions, neither the scalar nor the tensor interaction can produce any significant effects on the CP asymmetries (relative to the SM predictions) in the processes considered, especially under the “single coefficient dominance” assumption.

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One-loop determination of τ → π(K)ντ [γ] branching ratios and new physics tests

Arroyo-Ureña

Hernández-Tomé

López-Castro

et al. 2022

J. High Energ. Phys.

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We calculate the ratios Rτ/P≡ Γ (τ → Pντ [γ]) /Γ (P → μνμ [γ]) (P = π, K) at one loop following a large-NC expansion where Chiral Perturbation Theory is enlarged by including the lightest resonances and respecting the short-distance behavior dictated by QCD. We find δRτ/π = (0.18 ± 0.57)% and δRτ/K = (0.97 ± 0.58)%, where the uncertainties are induced fundamentally by the counterterms. We test the lepton universality, obtaining |gτ/gμ|π = 0.9964 ± 0.0038 and |gτ/gμ|K = 0.9857 ± 0.0078, and analyze the CKM unitarity, getting results at 2.1σ and 1.5σ from unitarity via |Vus/Vud| and |Vus|, respectively. We also update the search for non-standard interactions in τ decays. As a by-product, we report the theoretical radiative corrections to the τ → Pντ [γ] decay rates: δτπ = −(0.24 ± 0.56)% and δτK = −(0.15 ± 0.57)%.

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Hadronic τ Decays as New Physics Probes in the LHC Era

Cited by 90 publications

References 85 publications

Exclusive hadronic tau decays as probes of non-SM interactions

Exclusive hadronic tau decays as probes of non-SM interactions

CP asymmetry in the angular distributions of τ → KSπντ decays. Part II. General effective field theory analysis

One-loop determination of τ → π(K)ντ [γ] branching ratios and new physics tests

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