In this Thesis two different parts can be distinguished. In the first one,
after a review of the SM Higgs sector, I describe some scenarios for new
physics such as Little Higgs and Supersymmetry and discuss our contributions in
each of them. In the second part I focus on one of the most interesting
experimental hints of new physics, the forward-backward asymmetry in top-pair
production measured at the Tevatron, analyzing in detail its possible
implications at the LHC.Comment: Ph.D. Thesis, Universidad de Granada, March 2012, 129 page
