Research objectives and content
The investigation of lepton-hadron deep inelastic scattering at large momentum transfers allows the exploration of the fundamental interactions and constituents of matter at the smallest distances. At HERA, positrons (or electrons) and protons collide head-on with energies of 27.5 GeV and 820 GeV, respectively. Measurements of jet production in both neutral and charged current processes in deep inelastic scattering at large momentum transfers are sensitive to new particles or interactions beyond the Standard Model. The characteristics of the jets associated to these type of events depend upon the properties of the hypothetical new particle or interaction and, therefore, allow the determination of the source for new physics involved. If the results turn out to be in agreement with the predictions of the Standard Model, these measurements constitute in itself a test of Quantum Chromo Dynamics (the theory of the strong interactions) at the smallest distances explored so far. The measurement of jet rates, when compared to next-to-leading order perturbative calculations, allows a determination of the strong coupling constant of QCD, which is the fundamental parameter of the theory. Training content (objective, benefit and expected impact) The development of techniques to study the characteristics of very energetic positrons and jets of hadrons in calorimeters, to reconstruct as most accurately as possible the kinematic variables in deep inelastic scattering at large momentum transfers and to extract physics results from the measurements using next-to-leading order QCD programs.
Links with industry / industrial relevance (22)