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Lattice QCD calculation of hadronic light-by-light scattering

We perform a lattice QCD calculation of the hadronic light-by-light scattering amplitude in a broad kinematical range. At forward kinematics, the results are compared to a phenomenological analysis based on dispersive sum rules for light-by-light scattering. The size of the pion pole contribution is investigated for momenta of typical hadronic size. The presented numerical methods can be used to compute the hadronic light-by-light contribution to the anomalous magnetic moment of the muon. Our calculations are carried out in two-flavor QCD with the pion mass in the range of 270 to 450MeV, and contain so far only the diagrams with fully connected quark lines.

preprint2015arXivOpen access
Jeremy GreenOleksii GryniukGeorg von HippelHarvey B. MeyerVladimir Pascalutsa
hep-phhep-lat
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Jeremy GreenOleksii GryniukGeorg von HippelHarvey B. MeyerVladimir Pascalutsa

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