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Pion-pole contribution to HLbL from twisted mass lattice QCD at the physical point

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arxiv 2112.03586 v3 pith:PBAT4VTJ submitted 2021-12-07 hep-lat

Pion-pole contribution to HLbL from twisted mass lattice QCD at the physical point

classification hep-lat
keywords contributionpionfactorformgammalatticemassphysical
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We report on our computation of the pion transition form factor ${\cal F}_{P\rightarrow \gamma^*\gamma^*}$ from twisted mass lattice QCD in order to determine the numerically dominant light pseudoscalar pole contribution in the hadronic light-by-light scattering contribution to the anomalous magnetic moment of the muon $a_\mu =(g-2)_\mu$. The pion transition form factor is computed directly at the physical point. We present first results for our estimate of the pion-pole contribution with kinematic setup for the pion at rest.

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