Abstract
Higgs pair production is crucial for measuring the Higgs boson self-coupling. The dominant channel at hadron colliders is gluon fusion via heavy-quark loops. We present the results of a fully exclusive simulation of gluon fusion Higgs pair production based on the matrix elements for $hh+0$, 1 partons including full heavy-quark loop dependence, matched to a parton shower. We examine and validate this new description by comparing it with (a) Higgs effective theory predictions, (b) exact $hh+0$-parton sample showered by Pythia, and (c) exact $hh+1$-parton distributions, by looking at the most relevant kinematic distributions, such as ${p}_{T}^{h}$, ${p}_{T}^{hh}$, ${M}_{hh}$ spectra, and the jet rate as well. We find that matched samples provide a state-of-the-art accurate exclusive description of the final state.
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