Aug 8 – 13, 2022
Hörsaalzentrum Poppelsdorf
Europe/Berlin timezone

The hadronic running of the electromagnetic coupling and electroweak mixing angle (Part I)

Aug 9, 2022, 5:30 PM
20m
CP1-HSZ/Ground-0.001 - HS3 (CP1-HSZ)

CP1-HSZ/Ground-0.001 - HS3

CP1-HSZ

50
Oral Presentation QCD in searches for physics beyond the Standard Model QCD in searches for physics beyond the Standard Model

Speaker

Miguel Teseo San José Pérez (IJCLab)

Description

We employ $N_\mathrm{f}=2+1$ flavours of $O(a)$ improved Wilson fermions to determine the hadronic vacuum polarisation functions $\bar{\Pi}^{\gamma\gamma}$ and $\bar{\Pi}^{\gamma Z}$ for Euclidean squared momenta $Q^2\leq 7$ $\mathrm{GeV}^2$. We extrapolate the results to the physical point using ensembles at four lattice spacings and several pion masses, including its physical value. We observe a tension of up to 3.5 standard deviations between our lattice results for $\Delta\alpha_\mathrm{had}^{(5)}(-Q^2)$ and estimates based on the $R$-ratio for space-like momenta in the range $3-7~\mathrm{GeV}^2$.

Primary authors

Andreas Risch (DESY, NIC) Miguel Teseo San José Pérez (IJCLab) Antoine Gérardin (Aix-Marseille-Universit ́e, Universit ́e de Toulon, CNRS, CPT, Marseille, France) Georg von Hippel (JGU Mainz) Hartmut Wittig Harvey B. Meyer (Johannes Gutenberg University Mainz) Jonas Wilhelm Kohtaroh Miura (Helmholtz-Institut Mainz, Johannes Gutenberg-Universit ̈at Mainz, Germany) Konstantin Ottnad (University of Mainz) Marco Cè (AEC and ITP, Universität Bern)

Presentation materials