In this thesis a detailed discussion of resummation in QCD for high
energy perturbative effects (with High Energy Jets or HEJ) and in the soft-collinear regime (with the Pythia parton shower) for processes involving the production of jets at hadron collider experiments. We develop and validate a sophisticated novel
prescription (HEJ+Pythia) for merging high energy with soft-collinear resummation, which preserves the logarithmic accuracy of each resummation. Predictions produced by merging the resummation schemes in this way are compared to experimental data for inclusive pp → jj production at the Large Hadron Collider (LHC). Future experimental analyses to disentangle high-energy and soft-collinear effects are suggested.

We also extend the HEJ framework and present significant developments in the description of Higgs production, particularly in describing inclusive pp → H + 1j production at hadron colliders, and compare predictions within this framework to LHC data. This presents the first leading-logarithmically accurate HEJ-resummed prediction for an inclusive single-jet process, and represents a significant development in precision descriptions of strong physics in the Higgs sector at large energies.