Higgs boson pair production at NLO in the Powheg approach and the top quark mass uncertainties Emanuele Bagnaschi, Giuseppe Degrassi and Ramona Gröber Eur. Phys. J. C, 83 11 (2023) 1054 Published online: 18 November 2023 DOI: 10.1140/epjc/s10052-023-12238-8