PRISMA+ Colloquium

July 19, 2023 at 1 p.m. in Lorentz-Raum, 05-127, Staudingerweg 7

Prof. Dr. Tobias Hurth
Institut für Physik, THEP

On the determination of Delta alpha(M_Z): comparison between methods and frameworks
Dr. Rodolfo Ferro-Hernandez (JGU Mainz)

The fine structure constant is a fundamental parameter in the Standard Model, playing a crucial role in computing a wide range of observables and consistency relations. While the current error on $\Delta\alpha(M_Z)$ is at the level of $\sim10^{-4}$, future requirements, such as those of the FCC-ee/ILC, demand a reduction. In this talk, the referent presents an updated calculation of the hadronic contribution to $\Delta\alpha(M_Z)$. He will review different computational methods, such as the explicit integration in the timelike , renormalization group equations (RGE), and the euclidean split technique. The results emphasize the importance of accurately accounting for the charm quark contributions.