Radiative corrections to 
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: A reliable new physics test

Arroyo-Ureña, M. A.; Hernández-Tomé, G.; López-Castro, G.; Roig, Pablo; Rosell, Ignasi

doi:10.1103/physrevd.104.l091502

Cited by 11 publications

(8 citation statements)

References 24 publications

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“…where the leading-order result R (0) τ /P was given in (1.2) and |g τ /g µ | = 1 according to LU. Considering our results reported in (4.13) and the current experimental data [16], we find [11] g τ g µ π = 0.9964 ± 0.0028 th ± 0.0025 exp = 0.9964 ± 0.0038, g τ g µ K = 0.9857 ± 0.0028 th ± 0.0072 exp = 0.9857 ± 0.0078, (5.5) at 0.9σ and 1.8σ of lepton universality, respectively. These results should be compared with the HFLAV analysis of ref.…”

Section: Jhep02(2022)173supporting

confidence: 60%

“…Final result. We show a summary of the different contributions to δR τ /P in table 2, which lead our final result [11]:…”

Section: Jhep02(2022)173mentioning

confidence: 96%

“…Now, using δR τ /P | vSD = δ τ P | vSD − δ P µ | vSD it is found that [11] δR τ /π vSD = −(1.02 ± 0.57)%,…”

Section: Jhep02(2022)173mentioning

confidence: 98%

“…Moreover, as it has been remarked in the introduction, the hadronization of the QCD currents of refs. [7][8][9][10] Total +(0.18 ± 0.57)% +(0.97 ± 0.58)% new [11] Table 2. Numerical values of the different photonic contributions to δR τ /P : Structure Independent (SI), real-photon Structure Dependent (rSD) and virtual-photon Structure Dependent (vSD) [11].…”

Section: Jhep02(2022)173mentioning

confidence: 99%

“…Then, one of the most active tasks in both the theoretical and experimental particle physics program is the study and review of all the different observables testing LU, including low-energy JHEP02(2022)173 precision probes using pion, kaons and tau leptons [5]. In this work, we test LU between the second and third families of charged leptons through the ratio (P = π, K) [6][7][8][9][10][11] R τ /P ≡ Γ (τ…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Jhep02(2022)173supporting

confidence: 60%

“…Final result. We show a summary of the different contributions to δR τ /P in table 2, which lead our final result [11]:…”

Section: Jhep02(2022)173mentioning

confidence: 96%

“…Now, using δR τ /P | vSD = δ τ P | vSD − δ P µ | vSD it is found that [11] δR τ /π vSD = −(1.02 ± 0.57)%,…”

Section: Jhep02(2022)173mentioning

confidence: 98%

Section: Jhep02(2022)173mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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Global fit of modified quark couplings to EW gauge bosons and vector-like quarks in light of the Cabibbo angle anomaly

Crivellin

Kirk

Kitahara

et al. 2023

J. High Energ. Phys.

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There are two tensions related to the Cabibbo angle of the CKM matrix. First, the determinations of Vus from Kμ2, Kℓ3, and τ decays disagree at the 3σ level. Second, using the average of these results in combination with β decays (including super-allowed β decays and neutron decay), a deficit in first-row CKM unitarity with a significance of again about 3σ is found. These discrepancies, known as the Cabibbo Angle anomaly, can in principle be solved by modifications of W boson couplings to quarks. However, due to SU(2)L invariance, Z couplings to quarks are also modified and flavour changing neutral currents can occur. In order to consistently assess the agreement of a new physics hypothesis with data, we perform a combined analysis for all dimension-six Standard Model Effective Field Theory operators that generate modified W couplings to first and second generation quarks. We then study models with vector-like quarks, which are prime candidates for a corresponding UV completion as they can affect W -quark couplings at tree level, and we perform a global fit including flavour observables (in particular loop effects in ∆F = 2 processes). We find that the best fit can be obtained for the SU(2)L doublet vector-like quark Q as it can generate right-handed W-u-d and W-u-s couplings as preferred by data.

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