Particle Physics Phenomenology

The Large Hadron Collider is the largest physics experiment ever built. Its objective is to test the most fundamental physics theories by making measurements at the smallest possible distances. An enormous joint effort between theorists and experimentalists is necessary to analyze and interpret the data. On the theory side one has to come up with models that solve the open problems of our present theory, the Standard Model. The most pressing open question after the discovery of the Higgs boson is whether electroweak symmetry is broken in a natural way or not, that is, whether a high degree of fine-tuning of fundamental parameters is necessary to reproduce the observed phenomena in Nature.