We study the indirect constraints on the quartic Higgs self-coupling that arise from double-Higgs production at future hadron colliders. To this purpose, we calculate the two-loop contributions to the gg→hh amplitudes that involve a modified h4 vertex. Based on our results, we estimate the reach of a pp collider operating at 27TeV and 100TeV centre-of-mass energy in constraining the cubic and quartic Higgs self-couplings by measurements of double-Higgs and triple-Higgs production in gluon-fusion.
@article{arxiv.1810.04665,
title = {Constraints on the quartic Higgs self-coupling from double-Higgs production at future hadron colliders},
author = {Wojciech Bizoń and Ulrich Haisch and Luca Rottoli},
journal= {arXiv preprint arXiv:1810.04665},
year = {2020}
}