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

Pion pole contributions to HLbL at the physical point

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

CP1-HSZ/0.001 (CP1-HSZ) - HS3


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


Gurtej Kanwar (University of Bern)


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)

Presentation materials