The leading hadronic contribution to the running of the Weinberg angle using covariant coordinate-space methods

Abstract

We present a preliminary study of the leading hadronic contribution to the running of the Weinberg angle ${\theta }_{\mathrm{W}}$. The running is extracted from the correlation function of the electromagnetic current with the vector part of the weak neutral current using both the standard time-momentum representation method and the Lorentz-covariant coordinate-space method recently introduced by Meyer. Both connected and disconnected contributions have been computed on $N_{\mathrm{f}}=2+1$ non-perturbatively $O(a)$-improved Wilson fermions configurations from the CLS initiative. Similar covariant coordinate-space methods can be used to compute the leading hadronic contribution to the anomalous magnetic moment of the muon $(g-2{)}_{\mu }$ and to the running of the QED coupling $\alpha$.

Comments: 7 pages, 2 figures, talk presented at The 36th Annual International Symposium on Lattice Field Theory, July 22-28, 2018, East Lansing, MI, USA