24-30 July 2016
Highfield Campus, University of Southampton
Europe/London timezone

Position-space approach to hadronic light-by-light scattering in the muon $g-2$ on the lattice

26 Jul 2016, 15:40
20m
Building B2a Room 2077 (Highfield Campus, University of Southampton)

Building B2a Room 2077

Highfield Campus, University of Southampton

Talk Hadron Structure Hadron Structure

Speaker

Mr Nils Asmussen (Institut für Kernphysik, Johannes Gutenberg-Universität Mainz)

Description

The anomalous magnetic moment of the muon currently shows a more than $3\sigma$ discrepancy between the experimental value and recent Standard Model predictions. The theoretical uncertainty is dominated by the hadronic vacuum polarization and the hadronic light-by-light (HLbL) scattering contributions, where the latter has so far only been fully evaluated using different models. To pave the way for a lattice calculation of HLbL, we present an expression for the HLbL contribution to $g-2$ that involves a multidimensional integral over a position-space QED kernel function in the continuum and a lattice QCD four-point correlator. We describe our semi-analytic calculation of the kernel and test the approach by evaluating the $\pi^0$-pole contribution in the continuum.

Primary authors

Dr Andreas Nyffeler (Institut für Kernphysik, Johannes Gutenberg-Universität Mainz) Prof. Harvey B. Meyer (Institut für Kernphysik, Johannes Gutenberg-Universität Mainz) Dr Jeremy Green (Institut für Kernphysik, Johannes Gutenberg-Universität Mainz) Mr Nils Asmussen (Institut für Kernphysik, Johannes Gutenberg-Universität Mainz)

Presentation Materials