Speakers
Andreas Risch
(Universität Mainz)
Hartmut Wittig
Description
We discuss leading isospin breaking effects in the hadronic vacuum polarisation required for the investigation of the hadronic contribution to $(g-2)_{\mu}$. The calculation proceeds by expanding the relevant correlation functions around the isosymmetric limit. Isosymmetric observables are evaluated on CLS gauge ensembles with $N_{f}=2+1$, $O(a)$ improved Wilson fermions and open boundary conditions. A particular emphasis is placed on the relevant quark-disconnected diagrams required for a complete treatment of leading isospin breaking effects in the valence quark sector. We provide a detailed discussion of the renormalisation of the vector current in QCD+QED taking operator mixing into account.
Primary author
Andreas Risch
(Universität Mainz)
Co-author
Hartmut Wittig
