Deriving experimental constraints on the scalar form factor in the second-class $\tau \to\eta \pi \nu$ mode - Archive ouverte HAL
Communication Dans Un Congrès Année : 2021

Deriving experimental constraints on the scalar form factor in the second-class $\tau \to\eta \pi \nu$ mode

Résumé

The rare second-class decay mode of the $\tau$ into $\eta\pi\nu$ could be observed for the first time at Belle II. It is important to try to derive a reliable evaluation of the branching fraction and of the energy distribution of this mode within the standard-model. Many predictions exist already in the literature which can differ by one to two orders of magnitude. Here, an approach based on a systematic use of the property of analyticity of form factors and scattering amplitudes in QCD is discussed. In particular, we will show that the scalar form factor in the $\tau$ decay can be related to photon-photon scattering and radiative $\phi$ decay amplitudes for which precise experimental measurements have been performed by the Belle and KLOE collaborations.

Dates et versions

hal-03500375 , version 1 (22-12-2021)

Identifiants

Citer

B. Moussallam. Deriving experimental constraints on the scalar form factor in the second-class $\tau \to\eta \pi \nu$ mode. 16th International Workshop on Tau Lepton Physics , Sep 2021, Online, United States. ⟨hal-03500375⟩
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