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

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

Aug 9, 2022, 5:50 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

Speakers

Hartmut Wittig Miguel Teseo San José Pérez (IJCLab)

Description

We discuss the conversion of our lattice result for the hadronic running of the electromagnetic coupling, $\Delta\alpha(-Q^2)$, computed for Euclidean momenta into an estimate for $\Delta\alpha^{(5)}_{\rm had}(M_Z^2)$ using the Euclidean split technique (Adler function approach). We focus specifically on the running in the spacelike regime from momentum scales below $7\,\rm GeV^2$ up to $M_Z^2$, which can be determined either in perturbative QCD or by using dispersion theory and experimentally determined hadronic cross sections. A detailed comparison with results from other lattice calculations and phenomenology is performed. We present an in-depth discussion of the relation to lattice estimates of the hadronic vacuum polarisation contribution to the muon $g-2$ and the implications for global electroweak fits.

Primary author

Hartmut Wittig

Co-authors

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

Presentation materials