Hadron structure in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>τ</mml:mi><mml:mo>→</mml:mo><mml:mi>K</mml:mi><mml:mi>K</mml:mi><mml:mi>π</mml:mi><mml:msub><mml:mi>ν</mml:mi><mml:mi>τ</mml:mi></mml:msub></mml:math>decays

Dumm, D. Gómez; Roig, Pablo; Pich, Antonio; Portolés, Jorge

doi:10.1103/physrevd.81.034031

Cited by 100 publications

(131 citation statements)

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“…Beyond these energies, we propose a complementary expression for the form factor that includes the effects of the excited states ρ ′ and ρ ′′ , matching smoothly the previous one at s ∼ s max . Our result for the full form factor can be useful to improve the new version of TAUOLA [41], which presently includes the expressions obtained within a chiral Lagrangian framework with resonances [42,43,44,45,46]. This is important [47] not only for the proper simulation of backgrounds and subsequent signal extraction at the more frequent tau decay modes but also for the analysis of rare processes and the searches of new physics [48].…”

Section: Introductionmentioning

confidence: 99%

Dispersive representation of the pion vector form factor in τ→ππν τ decays

Dumm

Roig

2013

Eur. Phys. J. C

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We propose a dispersive representation of the charged pion vector form factor that is consistent with chiral symmetry and fulfills the constraints imposed by analyticity and unitarity. Unknown parameters are fitted to the very precise data on τ − → π − π 0 ντ decays obtained by Belle, leading to a good description of the corresponding spectral function up to a ππ squared invariant mass s ≃ 1.5 GeV 2 . We determine the ρ(770) mass and width pole parameters and obtain the values of low energy observables. The significance of isospin breaking corrections is also discussed. For larger values of s, this representation is complemented with a phenomenological description to allow its implementation in the new TAUOLA hadronic currents.

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Section: Introductionmentioning

confidence: 99%

Dispersive representation of the pion vector form factor in τ→ππν τ decays

Dumm

Roig

2013

Eur. Phys. J. C

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“…The issue is discussed in detail in our article [15]. We conclude that [34] the measured isovector component in e + e − → K S K ± π ∓ does not provide the total isovector component for the (partially) inclusive decay e + e − → KKπ.…”

Section: τ → Kkπν τmentioning

confidence: 85%

“…As a result, we obtain constraints [15], [24] among all axial-vector current couplings but λ 0 , that are also the most general ones satisfying the demanded asymptotic behaviour in τ → 3πν τ , studied along these lines in [25]. Proceeding analogously with the vector current form factor results in five additional restrictions [15]. From the 24 initially free couplings in Eq.…”

Section: Asymptotic Behaviour and Qcd Constraintsmentioning

confidence: 95%

“…The subindex of the operators stands for the kind of vertex described, i.e., O i V P P P gives a coupling between one Vector and three Pseudoscalars. For the explicit form of the operators in the last line, see [13], [14], [15]. For the matching of 2 and 3-point Green Functions in the OPE of QCD and in RχT and for requiring a Brodsky-Lepage behaviour to the corresponding form factors see [10], [13], [14], [16], [17], [18], [19], [20], [21], [22].…”

Section: Resonance Chiral Theorymentioning

confidence: 99%

“…We present here an updated analyses for the 3π mode [15] that we confront to ALEPH data [29], to the original work of Kühn and Santamaría [30] and to the parameterization included in TAUOLA [31]. In the Figure 4.1 we see that our parameterization -although depending on just one free parameter-is the one working better.…”

Section: τ → 3πν τmentioning

confidence: 99%

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Hadronic matrix elements for TAUOLA: 3π and KKπ channels

Roig¹

2009

Nuclear Physics B - Proceedings Supplements

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We emphasize that the motivation for including our hadronic matrix elements in TAUOLA is not only theoretical. We also show that our expressions describe better the τ → 3π ALEPH data and are able to fit BABAR data on the isovector component of e + e − → KKπ. The theoretical foundations of our framework are the large-NC limit of QCD, the chiral structure exhibited at low energies and the proper asymptotic behaviour, ruled by QCD, that is demanded to the associated form factors.

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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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Hadron structure inτ→KKπντdecays

Cited by 100 publications

References 64 publications

Dispersive representation of the pion vector form factor in τ→ππν τ decays

Dispersive representation of the pion vector form factor in τ→ππν τ decays

Hadronic matrix elements for TAUOLA: 3π and KKπ channels

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

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