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The resummed transverse momentum distribution of the Higgs boson in gluonfusion through LO+NLL for small transverse momenta is considered, where theHiggs is produced through a top- and bottom-quark loop. We study the masseffects with respect to the infinite top-mass approach. The top-mass effectsare small and the heavy-top limit is valid to better than 4% as long as theHiggs' transverse momentum stays below 150 GeV. When the bottom loop isconsidered as well, the discrepancy reaches up to about 10%. We conclude thatbottom-mass effects cannot be included in a reasonable manner by a naivereweighting procedure in the heavy-top limit. We compare our results to anearlier, alternative approach based on POWHEG.

Top- and bottom-mass effects in hadronic Higgs production at small transverse momenta through LO+NLL