Speakers
Antonio González
Carlos Quezada
Description
We continue previous studies of O(N) sigma models whose symmetry suffers of a spontaneous breaking down to O(N-1). We also consider soft explicit breaking terms, first, through an ad hoc variation of the potential and, in a second step, via one-loop corrections to the effective potential. These models are of a high interest for beyond Standard Model extensions (the minimally composite Higgs models, with N>=5) where, in addition to the spontaneous chiral symmetry breaking in the scalar sector, the Higgs arises as an additional (pseudo) Goldstone boson.
