We consider moments of the non-diagonal vector, axial-vector, scalar and pseudo-scalar current correlators involving two different massive quark flavours up to three-loop accuracy. Expansions around the limits where one mass is zero and the equal-mass case are computed. These results are used to construct approximations valid for arbitrary mass values.
@article{arxiv.1103.1481,
title = {Moments of heavy-light current correlators up to three loops},
author = {Jens Hoff and Matthias Steinhauser},
journal= {arXiv preprint arXiv:1103.1481},
year = {2015}
}