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We present a new Monte Carlo code for Higgs boson pair production atnext-to-leading order in the POWHEG-BOX Monte Carlo approach. The code is basedon analytic results for the two loop virtual corrections which include the fulltop quark mass dependence. This feature allows to freely assign the value ofall input parameters, including the trilinear Higgs boson self coupling, aswell as to vary the renormalization scheme employed for the top quark mass. Westudy the uncertainties due to the top-mass renormalization scheme allowing thetrilinear Higgs boson self coupling to vary around its Standard Model valueincluding parton shower effects. Results are presented for both inclusive anddifferential observables.

Higgs boson pair production at NLO in the POWHEG approach and the top quark mass uncertainties