Abstract
In this presentation some aspects of Next-to-Leading Order (NLO) calculations in QCD are presented. The focus is brought to aspects of such calculations for processes involving a high final-state particle multiplicity.
Highlights
Events with a large number of jets are common place at the LHC, both in Standard Model (SM) measurements and as signature or background to beyond the standard model (BSM) models
Next-to-Leading Order (NLO) calculations improve upon Born-level calculations by reducing the dependence of the latter on the unphysical renormalisation scale
At NLO the situation is greatly improved since the virtual matrix elements they include have an additional dependence on the renormalisation scale which cancel the tree-level scale dependence to a large degree
Summary
Events with a large number of jets are common place at the LHC, both in Standard Model (SM) measurements and as signature or background to beyond the standard model (BSM) models. 2. Unitarity technique To calculate NLO cross sections one has to include real emission matrix element and the virtual one-loop matrix elements for the process to account for one additional radiation and the influence of virtual particles respectively.
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