A jet based approach to measuring soft contributions to proton-proton collisions with the CMS experiment [Elektronische Ressource] / von Michael Heinrich

AJET BASED APPROACH TO MEASURING SOFTCONTRIBUTIONS TO PROTON-PROTON COLLISIONS WITH THECMS EXPERIMENTZur Erlangung des akademischen Grades einesDOKTORS DER NATURWISSENSCHAFTENvon der Fakultat¨ fur¨ Physik desKarlsruher Instituts fur¨ Technologie (KIT) genehmigteDISSERTATIONvonDipl. Phys. Michael HeinrichTag der mundlichen¨ Prufung:¨ 21. Januar 2011Referent: Prof. Dr. G. QuastInstitut fur¨ Experimentelle KernphysikKorreferent: Prof. Dr. W. de BoerInstitut fur¨ Experimentelle Kernphysik’The Whole World is our Playground’A Jet-Based Approach to Measuring Soft Contributions to Proton Collisions with theCMS ExperimentThe early running stages of the Large Hadron Collider (LHC) offered perfect conditions tostudy the Underlying Event (UE) in proton collisions. This term denotes all effects in col-lider events that are not directly related to the hard partonic interaction. As these effectsare present in all collisions, it is necessary to include them in Monte Carlo simulations. Itis however not possible to calculate UE contributions with means of perturbation theory,which makes the application of phenomenological models necessary. These models have tobe tuned to data, a process that has to be repeated at every newly accessed collision energy.