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In this proceeding we consider QCD radiative corrections to the production ofcolourless high-mass systems in hadron collisions. At small transverse momentumthe logarithmically-enhanced contributions can be organized to all perturbativeorders by a universal resummation formula that depends on a singleprocess-dependent hard factor. We show that the hard factor is directly relatedto the all-order virtual amplitude of the corresponding partonic process by auniversal (process independent) formula, which we explicitly evaluate up totwo-loop level. Once the next-to-next-to-leading order (NNLO) scatteringamplitude is available, the corresponding hard factor is directly determined.It can be used in fully-exclusive perturbative calculations (via q$_T$subtraction formalism) up to NNLO, in resummed calculations at fullnext-to-next-to-leading logarithmic (NNLL) accuracy, and also, it's a necessaryingredient to the next subsequent logarithmic order (N$^3$LL).

Transverse-momentum resummation and the structure of hard factors at the NNLO