Resonance chiral Lagrangian currents and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>τ</mml:mi></mml:math>decay Monte Carlo

We test a data-driven approach based on QCD factorization for charmless three-body B-decays by confronting it to measurements of CP violation in B − → π − π + π − . While some of the needed non-perturbative objects can be directly extracted from data, some others can, so far, only be modelled. Although this approach is currently model dependent, we comment on the perspectives to reduce this model dependence. While our model naturally accommodates the gross features of the Dalitz distribution, it cannot quantitatively explain the details seen in the current experimental data on local CP asymmetries. We comment on possible refinements of our simple model and conclude by briefly discussing a possible extension of the model to large invariant masses, where large local CP asymmetries have been measured.

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“…Here we use the parametrization of ref. [14] fitted to the measurements of e + e − → π + π − (γ) [15] (see also ref. [16]).…”

Section: The Pion Decay Constant and The Timelike Pion Form Factorsmentioning

confidence: 99%

CP violation in multibody B decays from QCD factorization

Klein

Mannel

Virto

et al. 2017

J. High Energ. Phys.

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“…The considered τ − → K − η ( ) ν τ decays are currently modeled in TAUOLA [51,52], the standard Monte Carlo generator for tau lepton decays, relying on phase space. We would like to provide the library with Resonance Chiral Lagrangian-based currents [53,54] that can describe well these decays for their analyses and for the characterization of the backgrounds they constitute to searches of rarer tau decays and new physics processes.…”

Section: Introductionmentioning

confidence: 99%

τ − →K − η (′) ν τ decays in Chiral Perturbation Theory with resonances

Escribano

Gonzàlez-Solís

Roig

2013

J. High Energ. Phys.

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Abstract:We have studied the τ − → K − η ( ) ν τ decays within Chiral Perturbation Theory including resonances as explicit degrees of freedom. We have considered three different form factors according to treatment of final-state interactions. In increasing degree of soundness: Breit-Wigner, exponential resummation and dispersive representation. We find that although the first one fails in accounting for the data on the Kη mode, the other two approaches provide good fits to them which are sensitive to the K (1410) pole parameters, that are determined to be M K = 1330 +27 −41 MeV and Γ K = 217 +68 −122 MeV. These values are competitive with the standard determination from τ − → (Kπ) − ν τ decays. The corresponding predictions for the τ − → K − η ν τ channel respect the current upper bound and hint to the discovery of this decay mode in the near future.

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“…For the other aspects and physics details, we address the reader to references [16,10] as well as the references herein, for presentation of this rich and complicated activity.…”

Section: Introductionmentioning

confidence: 99%