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Strong coupling at the $\tau$-mass scale from an improved vector isovector spectral function
by Diogo Boito, Maarten Golterman, Kim Maltman, Santiago Peris, Marcus V. Rodrigues, Wilder Schaaf
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Submission summary
Authors (as registered SciPost users): | Diogo Boito |
Submission information | |
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Preprint Link: | scipost_202112_00034v1 (pdf) |
Date accepted: | Dec. 11, 2024 |
Date submitted: | Dec. 14, 2021, 4:56 p.m. |
Submitted by: | Boito, Diogo |
Submitted to: | SciPost Physics Proceedings |
Proceedings issue: | 16th International Workshop on Tau Lepton Physics (TAU2021) |
Ontological classification | |
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Academic field: | Physics |
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Approach: | Phenomenological |
Abstract
We perform a precise extraction of the QCD coupling at the $\tau$-mass scale, $\alpha_s(m_\tau)$, from a new vector isovector spectral function which combines ALEPH and OPAL distributions for the dominant channels, $\tau\to\pi \pi^0\nu_\tau$, $\tau\to 3\pi \pi^0\nu_\tau$ and $\tau\to \pi 3\pi^0\nu_\tau$, with estimates of sub-leading contributions obtained fromelectroproduction cross-sections using CVC, as well as BaBar results for $\tau \to K^-K^0\nu_\tau$. The fully inclusive spectral function thus obtained is entirely based on experimental data, without Monte Carlo input. From this new data set, we obtain $\alpha_s(m_\tau)=0.3077\pm0.0075$, which corresponds to $\alpha_s(m_Z)=0.1171\pm0.0010$. This analysis can be improved on the experimental side with new measurements of the dominant $\pi\pi^0$, $\pi 3\pi^0$, and $3\pi \pi^0$ $\tau$ decay modes.
Published as SciPost Phys. Proc. 16, 004 (2025)
Reports on this Submission
Report #1 by Swagato Banerjee (Referee 1) on 2024-11-29 (Invited Report)
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