We compute the next-to-next-to-leading order QCD corrections for Standard Model Higgs boson pair production inclusive cross section at hadron colliders within the large top-mass approximation. We provide numerical results for the LHC, finding that the corrections are large, resulting in an increase of O(20 with respect to the next-to-leading order result at c.m. energy sH=14TeV. We observe a substantial reduction in the scale dependence, with overlap between the current and previous order prediction. All our results are normalized using the full top- and bottom-mass dependence at leading order. We also provide analytical expressions for the K factors as a function of sH.
@article{arxiv.1309.6594,
title = {Higgs Boson Pair Production at Next-to-Next-to-Leading Order in QCD},
author = {Daniel de Florian and Javier Mazzitelli},
journal= {arXiv preprint arXiv:1309.6594},
year = {2013}
}