9th Plenary Workshop of the Muon g-2 Theory Initiative

Towards hadronic light-by-light contribution to the muon g-2 with C* boundary conditions

Aug 6, 2026, 12:15 PM

15m

GS117 and GS119 (Department of Physics, University of Connecticut)

Lattice HLbL

Speaker

Khai Phan (ETH Zurich)

Description

Within the RC* programme, we are working towards an independent lattice calculation of the hadronic light-by-light (HLbL) contribution to the muon $g$-2, with $C^\star$ boundary conditions using openQxD. As a proof of concept, we compute the analogous leptonic light-by-light contribution in quenched QED at large coupling, benchmarked against the perturbative Laporta–Remiddi result, and present a preliminary analysis on the coarsest of several ensembles. We discuss the signal-to-noise problem in this approach and its implications for the planned computation in full QCD+QED.