Data-based form factor corrections between the two-pion $τ$ and $e^+e^-$ spectral functions Article Swipe
The $τ$ spectral functions are an alternative to $e^+e^-$ cross-sections, where different measurements are not consistent, for computing the hadronic vacuum contribution to the muon magnetic anomaly $a_μ$. This requires a control of isospin-breaking effects which have to be corrected for. So far these corrections have been evaluated using theoretical models. In this letter, a new approach based only on data is presented for the determination of the most critical correction relating the $e^+e^-$ and $τ$ pion form factors. An updated evaluation of the total isospin-breaking correction is given and its impact is discussed in the context of $e^+e^-$-based $a_μ$ predictions and of the direct measurement.
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- article
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- http://arxiv.org/abs/2504.13789
- https://arxiv.org/pdf/2504.13789
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Data-based form factor corrections between the two-pion $τ$ and $e^+e^-$ spectral functionsWork title
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articleOpenAlex work type
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enPrimary language
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2025Year of publication
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2025-04-18Full publication date if available
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M. Davier, Bogdan Malaescu, Z. ZhangList of authors in order
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https://arxiv.org/abs/2504.13789Publisher landing page
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https://arxiv.org/pdf/2504.13789Direct link to full text PDF
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YesWhether a free full text is available
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greenOpen access status per OpenAlex
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0Total citation count in OpenAlex
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