Unveiling the Structure of the Nucleon in High-Energy Collisions

Dr. Pedro Jimenez-Delgado

Jefferson National Accelerator Laboratory

Developments in our knowledge of nature at the most fundamental level are driven nowadays by large particle physics experiments. For the realization, analysis, and understanding of many such experiments, a precise description of scattering processes is needed. Some techniques for the calculation of observables in high-energy scattering experiments within the context of perturbative quantum chromodynamics will be overviewed. The description of collisions involving hadrons in the initial state is based in the so-called factorization theorems, which state that the structure of hadrons in such interactions may be described in terms of their constituents partons (quarks and gluons) by universal distribution functions which are extracted from experiment. The calculation of the structure functions of the nucleon in inclusive deep inelastic scattering will be described in some detail. Some aspects of the calculation of exclusive observables, in particular the construction of parton-level Monte Carlo event generators and subtraction techniques for the treatment of infrared singularities will be briefly discussed. Global QCD analysis, i.e., the determination of unpolarized (and polarized) parton distribution functions, will be overviewed; and a review of our current knowledge of these distributions will be given.