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Deriving experimental constraints on the scalar form factor in the second-class $τ\toηπν$ mode
by B. Moussallam
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Submission summary
| Authors (as registered SciPost users): | Bachir Moussallam |
| Submission information | |
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| Preprint Link: | https://arxiv.org/abs/2112.04429v1 (pdf) |
| Date accepted: | March 19, 2025 |
| Date submitted: | Dec. 9, 2021, 2:50 p.m. |
| Submitted by: | Moussallam, Bachir |
| Submitted to: | SciPost Physics Proceedings |
| Proceedings issue: | 16th International Workshop on Tau Lepton Physics (TAU2021) |
| Ontological classification | |
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| Academic field: | Physics |
| Specialties: |
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| Approach: | Theoretical |
Abstract
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.
Published as SciPost Phys. Proc. 16, 009 (2025)
Reports on this Submission
Strengths
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The paper is on a topical subject and is of importance to experiments.
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It uses a large number of inputs from diverse experimental sources of information.
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It uses the power of analyticity and unitarity and the Omnes formalism suited for the problem at hand.
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The results are of use for the BELLE experiment
Weaknesses
- The subject is quite technical and is hard to summarize in a conference proceedings, but the author has done his best.
Report
Recommendation
Publish (surpasses expectations and criteria for this Journal; among top 10%)
Report
and to φ → γηπ, for which data exist. I would only give the author to correct a few typos before publishing it: 'Tony' -> 'Toni', 'where implemented'->'were implemented' and ' and idea proposed' ->' an idea proposed'.
Recommendation
Publish (surpasses expectations and criteria for this Journal; among top 10%)
Report #1 by Swagato Banerjee (Referee 1) on 2024-11-29 (Invited Report)
Report
Recommendation
Publish (surpasses expectations and criteria for this Journal; among top 10%)