We present new high precision predictions for bottom-quark pair production in hadronic collisions. These results are obtained through the implementation of a Monte Carlo event generator in the Powheg-Box framework, where the MiNNLOps method has been applied to match the next-to-next-to-leading order (NNLO) calculation to parton showers. Distributions inclusive over QCD radiation are NNLO...
Tuning of generators by the LHC experiments is presented.
In the colour decomposition approach to treating the SU(3) colour gauge group in automated event generators, the size of the colour matrix grows factorially with the number of external particles in the process. As such, the treatment of the colour degrees of freedom becomes the bottleneck for high-multiplicity QCD processes. We propose to utilize the large-$N_C$ expansion to obtain a sparse...
Two years ago, we introduced a new method for calculating Feynman diagrams more efficiently and transparently, the chirality-flow formalism. In this framework, which builds on the spinor-helicity formalism and is inspired by QCD colour flow, analytic tree-level Standard Model Feynman diagrams can be written down almost immediately as complex numbers, without the need for intermediate algebra....
