Catani Stefano, Fabre Ignacio, Grazzini Massimiliano, Kallweit Stefan
INFN, Sezione di Firenze, Florence, Italy.
Dipartimento di Fisica e Astronomia, Università di Firenze, Sesto Fiorentino, 50019 Florence, Italy.
Eur Phys J C Part Fields. 2021;81(6):491. doi: 10.1140/epjc/s10052-021-09247-w. Epub 2021 Jun 2.
We consider QCD radiative corrections to the associated production of a heavy-quark pair ( ) with a generic colourless system 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.
我们考虑了强子对撞机中重夸克对（ ）与一般无色系统相关产生过程中的量子色动力学辐射修正。我们讨论了在总横向动量 较小时 系统产生的重整化形式。我们给出了在次领头阶以及部分次次次领头阶相应重整化系数的结果。重整化公式的微扰展开得到了可用于将 减法形式应用于此类过程固定阶计算的明确成分。我们使用 减法形式对顶 - 反顶夸克对与希格斯玻色子的产生进行全微分微扰计算。在次领头阶，我们将我们的结果与用已确立的减法方法得到的结果进行比较，发现完全一致。我们首次给出了次次次领头阶味非对角部分子通道的结果。
