The strong coupling from hadronic $τ$-decay data including $τ\toπ^-π^0ν_τ$ from Belle
Fuente:
arXiv
Saved in:
| Main Authors: | , , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2025
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866917149590683648 |
|---|---|
| author | Boito, Diogo Eiben, Aaron Golterman, Maarten Maltman, Kim Mansur, Lucas M. Peris, Santiago |
| author_facet | Boito, Diogo Eiben, Aaron Golterman, Maarten Maltman, Kim Mansur, Lucas M. Peris, Santiago |
| contents | In previous work we have combined the $π^-π^0$, $2π^-π^+π^0$ and $π^-3π^0$ spectral data obtained from hadronic $τ$ decays measured by the ALEPH and OPAL experiments, together with electroproduction data for several of the subleading hadronic modes and BaBar data for the $K\bar{K}$ mode to construct an inclusive non-strange vector spectral function entirely based on experimental data, with no Monte-Carlo generated input. In this paper, we include, for the first time, the Belle $τ\toπ^-π^0ν_τ$ high-statistics decay data to construct a new inclusive non-strange vector spectral function that combines more of the world's available data. As no Belle data are at present available for the two $4π$ modes, this requires a revised data analysis in comparison with our previous work. From the resulting new spectral function, we obtain a new determination of the strong coupling, $α_s$, using our previously developed strategy based on finite-energy sum rules. We find, at the $Z$ mass scale, $α_s(m_Z^2)=0.1159(14)$. We discuss the smaller central value and larger error of our new result compared to our previous result, showing the shifts to be due mainly to significant changes in updated HFLAV results for the $π^-3π^0$ decay mode. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2502_08147 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | The strong coupling from hadronic $τ$-decay data including $τ\toπ^-π^0ν_τ$ from Belle Boito, Diogo Eiben, Aaron Golterman, Maarten Maltman, Kim Mansur, Lucas M. Peris, Santiago High Energy Physics - Phenomenology High Energy Physics - Experiment In previous work we have combined the $π^-π^0$, $2π^-π^+π^0$ and $π^-3π^0$ spectral data obtained from hadronic $τ$ decays measured by the ALEPH and OPAL experiments, together with electroproduction data for several of the subleading hadronic modes and BaBar data for the $K\bar{K}$ mode to construct an inclusive non-strange vector spectral function entirely based on experimental data, with no Monte-Carlo generated input. In this paper, we include, for the first time, the Belle $τ\toπ^-π^0ν_τ$ high-statistics decay data to construct a new inclusive non-strange vector spectral function that combines more of the world's available data. As no Belle data are at present available for the two $4π$ modes, this requires a revised data analysis in comparison with our previous work. From the resulting new spectral function, we obtain a new determination of the strong coupling, $α_s$, using our previously developed strategy based on finite-energy sum rules. We find, at the $Z$ mass scale, $α_s(m_Z^2)=0.1159(14)$. We discuss the smaller central value and larger error of our new result compared to our previous result, showing the shifts to be due mainly to significant changes in updated HFLAV results for the $π^-3π^0$ decay mode. |
| title | The strong coupling from hadronic $τ$-decay data including $τ\toπ^-π^0ν_τ$ from Belle |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2502.08147 |