Parity restoration at the LHC -- Alejandra Melfo (Andes University, Mérida Venezuela)

mercredi 14 déc. 2011, 14:00 → 15:00 Europe/Paris

Universe

Back in 1958 when Lee and Yang proposed that parity is broken in nature, they also produced a model for its possible restoration, involving three new families of "mirror" fermions. A more elegant approach is provided by the Left-Right symmetric model, where parity is broken spontaneously and leads to the (as yet) only evidence for physics beyond the standard model: neutrino mass.  In this talk I argue that the LHC can shed light on various aspects of both models. First,  I show that the mirror fermion possibility can only be realized with current high precision data if a new, inert higgs doublet is present, whose neutral component is in the right mass range to provide a dark matter candidate, but is possibly ruled out if the SM Higgs is in the light mass range. Then I give an example of how, in the context of Left-Right theories, the LHC can probe the existence of doubly-charged scalars responsible for neutrino mass through a type II see-saw mechanism, and how this can have implications for the SM Higgs search.