Speaker
Description
As several lattice collaborations agree on the result for the
window quantity of the hadronic vacuum polarization (HVP) contribution to
(g-2)_\mu, whilst being in tension with the calculation using the dispersive
approach, further effort is needed in order to pin down the cause for this
difference.
Here we investigate the isospin breaking corrections to the leading order HVP.
In many lattice applications, the photon propagator is treated
stochastically; however, by analogy with the hadronic light-by-light
contribution (HLbL) to (g-2),
we apply a coordinate-space approach to the HVP at NLO. We
present a calculation of the two diagrams of the (2+2) topology at
unphysical pion mass, where we apply a Pauli-Villars regularization for the
photon propagator in the diagram that is UV-divergent. We compare the
UV-finite diagram to the pseudoscalar exchange contributions.
| Topical area | Quark and Lepton Flavor Physics |
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