# Precision physics and the hadronic running of $\alpha$: a lattice perspective

- Institution: CERN
- Department: Theory Colloquia
- Speaker: Alessandro Conigli
- Year: 2025
- Language: English
- Subjects: Physics
- Source: [CERN](https://videos.cern.ch/record/3021715)
- Licence: [CERN](http://copyright.web.cern.ch)
- Who can watch: Tweens profiles and older (sources give no ratings; placed by Invisible Network from the source's own words)

Precision measurements are a powerful tool in the search for physics beyond the Standard Model, and their impact is often limited by our control of hadronic effects. After a brief mention of the muon $g-2$ anomaly as an example of this challenge, I will focus on the closely related quantity $\Delta\alpha_{\mathrm{had}}^{(5)}(M_Z^2)$, the hadronic contribution to the running of the electromagnetic coupling. I will present a recent high-precision lattice QCD determination of the hadronic vacuum polarization in the Euclidean region, achieving sub-percent accuracy and confirming tensions at space-like virtualities with data-driven estimates based on $e^+ e^-$ cross sections. Using the Euclidean split technique, we obtain a precise determination of the running of $\alpha$ up to the $Z$-pole and compare it with global electroweak fits. I will conclude with an outlook on future improvements and the precision targets set by the FCC-ee program. This talk complements Tuesday's Lattice Coffee Talk, where methodological details will be presented.

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## Lectures

1. [Precision physics and the hadronic running of $\alpha$: a lattice perspective](https://invisiblenetwork.ai/learn/cern/3021715/ef6e61e62bbb), 59 min (CERN's player)