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The Standard Model of fundamental interactions, albeit an incredibly elegantand successful theory, lacks explanations for some experimental and theoreticalopen questions. Interestingly, many of these problems seem to be related to theelectroweak symmetry breaking sector of the theory, whose dynamical generationis still unknown. Important questions such as what is the true nature of theHiggs boson, why is its mass so light and so close to that of the electroweakgauge bosons or whether the properties of this particle are the ones predictedin the Standard Model remain unanswered. The LHC is our tool to unveil thesemysteries and vector boson scattering processes are the perfect window toaccess them, since they are considered as the most sensitive observables to newphysics in the electroweak symmetry breaking sector. In this Thesis we employthe effective electroweak chiral Lagrangian with a light Higgs, which assumes astrongly interacting electroweak symmetry breaking sector, to perform a modelindependent analysis of the phenomenology of vector boson scattering processesat the LHC as well as to present quantitative predictions for the sensitivityto possible beyond the Standard Model physics scenarios.

New Physics Signals of the Electroweak Chiral Lagrangian in Vector Boson Scattering at the LHC