Postdoctoral Theses

A review of CP violation in the $B$ system and strategies to determine the unitarity triangle of the CKM matrix is given. We begin with an introduction to the description of CP violation in the Standard Model of electroweak interactions, and discuss the basic features of the theoretical framework to deal with non-leptonic B decays, which play the main role in this review. [...]

The electron-proton collider HERA with centre of mass system energy of about 300 GeV has extended the available kinematic regime in deep inelastic scattering to low values of Bjorken-x ($10^{−5}−10^{−3}$) and made possible studies of the QCD dynamics in this region. The processes in which partons carry a very small fraction of the proton momentum may show deviations from the standard DGLAP dynamics and it is believed that their correct description is provided by the BFKL evolution formalism. [...]

La structure des evenements de la diffusion profondement inelastique a HERA permet une Observation detaillee de l'etat final hadronique dans le referentiel du laboratoire. Dans cette these, nous presentons d'abord differentes methodes de reconstruction de l'energie hadronique pour le detecteur H1, en combinant en particulier la mesure calorimetriqueavec la mesure des traces chargees [...]