Prof. Svjetlana Fajfer: Higgs boson and expectation of New Physics

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   Higgs boson and  expectation of New Physics

   Prof. Svjetlana Fajfer, Oddelek za fiziko FMF Univerze v Ljubljani in Institut "Jožef Stefan"

Recent discovery of a Higgs-like particle with the mass ∼125 GeV, at LHC and Tevatron,  is extremely important for particle physics. The new particle has been observed in a number of different final states with rates roughly consistent with the Standard Model predictions. Only the decay rate of Higgs to two photons is slightly higher then the Standard model expectation. The role of the Higgs boson within Standard Model will be reviewed and possibilities of  New Physics presence  in Higgs boson physics will be discussed.   In particular, the impact of colored scalars that can couple directly to matter fields will be  considered.  Among all possible candidates only some colored scalar states can individually accommodate the excess and remain in agreement with all available data. Current experimental constraints require such colored states to have  a mass below 400 GeV. These states can appear in some of extensions of the Standard Model with primary focus on scenarios of matter unification.