# The 39th International Symposium on Lattice Field Theory (Lattice 2022)

Aug 8 – 13, 2022
Hörsaalzentrum Poppelsdorf
Europe/Berlin timezone

## Pion pole contributions to HLbL at the physical point

Aug 11, 2022, 10:40 AM
20m
CP1-HSZ/Ground-0.001 - HS3 (CP1-HSZ)

### CP1-HSZ/Ground-0.001 - HS3

#### CP1-HSZ

50
Oral Presentation QCD in searches for physics beyond the Standard Model

### Speaker

Gurtej Kanwar (University of Bern)

### Description

Pseudoscalar pole diagrams provide the bulk of the contribution -- as well as a large fraction of the error budget -- of dispersive estimates of the hadronic light-by-light (HLbL) piece of the muon g-2. We report on a calculation of the pion transition form factor $F_{P\rightarrow \gamma\gamma}$ over a range of kinematics, including broad regions which are inaccessible from experimental data, which directly leads to an estimate of the pion pole contribution to the muon g-2. The results are evaluated using physical quark masses and are extrapolated to the continuum using twisted mass ensembles at several lattice spacings. Our result for the g-2 contribution is comparable with previous lattice and data-driven determinations, with combined uncertainties achieving sub-10% precision.

### Primary authors

Gurtej Kanwar (University of Bern) Sebastian Andreas Burri (University of Bern) Marcus Petschlies (Helmholtz-Instituts für Strahlen- und Kernphysik) Urs Wenger (University of Bern)