We report calculations of hadronic light-by-light scattering amplitudes via lattice QCD evaluation of Euclidean four-point functions of vector currents. These initial results include only the fully quark-connected contribution. Particular attention is given to the case of forward scattering, which can be related via dispersion relations to the γ∗γ∗→ hadrons cross section, and thus allows lattice data to be compared with phenomenology. We also present a strategy for computing the hadronic light-by-light contribution to the muon anomalous magnetic moment.
@article{arxiv.1510.08384,
title = {Direct calculation of hadronic light-by-light scattering},
author = {Jeremy Green and Nils Asmussen and Oleksii Gryniuk and Georg von Hippel and Harvey B. Meyer and Andreas Nyffeler and Vladimir Pascalutsa},
journal= {arXiv preprint arXiv:1510.08384},
year = {2015}
}
Comments
7 pages, 4 figures. Talk presented at the 33rd International Symposium on Lattice Field Theory (Lattice 2015), 14-18 July 2015, Kobe International Conference Center, Kobe, Japan