The 43rd International Symposium on Lattice Field Theory (Lattice 2026)

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

29 Jul 2026, 10:20

20m

Pyon Su (Adele H. Stamp Student Union)

Contributed talk Quark and lepton flavor physics Quark and lepton flavor physics

Speaker

Khai Phan (ETH Zurich)

Description

The hadronic light-by-light (HLbL) contribution is the second-largest source of theoretical uncertainty in the Standard Model prediction of the muon g-2. Within the RC programme, we are developing an independent HLbL calculation with C boundary conditions using openQxD, based on the two-current subtraction method proposed by Hayakawa, Blum, Izubuchi and Yamada in 2005. As a controlled proof of concept, we compute the analogous leptonic LbL contribution in quenched QED, 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.

Presentation materials

lattice2026_talk.pdf