We propose a method to compute the hadronic vacuum polarization function on the lattice at continuous values of photon momenta bridging between the spacelike and timelike regions. We provide two independent demonstrations to show that this method leads to the desired hadronic vacuum polarization function in Minkowski spacetime. We show with the example of the leading-order QCD correction to the muon anomalous magnetic moment that this approach can provide a valuable alternative method for calculations of physical quantities where the hadronic vacuum polarization function enters.
@article{arxiv.1305.5878,
title = {Computing the hadronic vacuum polarization function by analytic continuation},
author = {Xu Feng and Shoji Hashimoto and Grit Hotzel and Karl Jansen and Marcus Petschlies and Dru B. Renner},
journal= {arXiv preprint arXiv:1305.5878},
year = {2013}
}
Comments
22 pages, 6 figures; v2, version accepted for publication in PRD