https://doi.org/10.1140/epjc/s10052-021-09247-w
Regular Article - Theoretical Physics
production at NNLO: the flavour off-diagonal channels
1
INFN, Sezione di Firenze, Florence, Italy
2
Dipartimento di Fisica e Astronomia, Università di Firenze, Sesto Fiorentino, 50019, Florence, Italy
3
Physik Institut, Universität Zürich, 8057, Zurich, Switzerland
4
International Center for Advanced Studies (ICAS), ICIFI and ECyT,Universidad Nacional de San Martin(UNSAM), 25 de Mayo y Francia (1650), Buenos Aires, Argentina
5
Dipartimento di Fisica, Università degli Studi di Milano-Bicocca, Milan, Italy
6
INFN, Sezione di Milano-Bicocca, 20126, Milan, Italy
Received:
23
February
2021
Accepted:
17
May
2021
Published online:
2
June
2021
We consider QCD radiative corrections to the associated production of a heavy-quark pair (
) with a generic colourless system F at hadron colliders. We discuss the resummation formalism for the production of the 
system at small values of its total transverse momentum 
. We present the results of the corresponding resummation coefficients at next-to-leading and, partly, next-to-next-to-leading order. The perturbative expansion of the resummation formula leads to the explicit ingredients that can be used to apply the subtraction formalism to fixed-order calculations for this class of processes. We use the subtraction formalism to perform a fully differential perturbative computation for the production of a top-antitop quark pair and a Higgs boson. At next-to-leading order we compare our results with those obtained with established subtraction methods and we find complete agreement. We present, for the first time, the results for the flavour off-diagonal partonic channels at the next-to-next-to-leading order.
© The Author(s) 2021
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