The High-Luminosity LHC (HL-LHC) offers unprecedented options to study QCD and the Standard Model in regions of phase space which were never accessible before. With the high luminosity, measurements can be performed in the multi-TeV regions, where the cross sections for production processes become small. For QCD studies this region is of extreme importance, because QCD-jets will become pencil-like since all particles are boosted into the jet direction, and QCD-jets allow resolutions of similar quality as leptons. In the extreme pt region, QCD resummation effects can be studied in a truly perturbative region.
At large transverse momenta, the masses of interacting particles becomes negligible. While parton densities of the proton, including in addition to quarks and gluons also the photon, are available, parton densities of the Z - and W - boson will become available in the next future. Processes like vector-boson fusion are calculated via matrix-elements, but at high transverse momenta, also resummation effects become important, and parton densities, as well as Transverse Momentum Dependent (TMD) parton densities of heavy bosons play a role.
The lecture will cover aspects of QCD in the very high pt region, introducing transverse momentum resummation, the evolution of heavy boson parton densities and its transverse momentum extension. The lecture will concentrate on possibilities of QCD at the HL-LHC, and cover experimental studies and results already obtained in the highest accessible pt region.
Disclaimer: this course will not discuss the application of general Monte Carlo event generators.
The Research Training Group (RTG) is carried out jointly by the Institute for Theoretical Particle Physics and Cosmology, Physics Institute III A and Physics Institute I B. The RTG is centred around LHC research. It builds on the particular strengths of the scientific groups at the RWTH Aachen University and the tradition of close collaboration between theory and experiment. The experimental groups at RWTH are part of the CMS collaboration. The theoretical group at RWTH covers a broad range of topics from precision calculations in quantum chromodynamics to the phenomenology of supersymmetry and dark matter.
