Faculty of Physics
University of Vienna
Prof. Helmuth Hüffel



November 25 - 27, 2011





Alberto Tonero (Trieste):


First steps toward an asymptotically safe model of electroweak interactions



In a minimal realization of the standard model that contains no Higgs boson the breaking of SU(2)xU(1) symmetry is provided by the coupling of gauge bosons and fermions to a nonlinear sigma model. Normally this is regarded only as an approximate description valid below some cutoff energy scale. However, if there is a UV fixed point, the higgsless theory in which the Nambu-Goldstone bosons are thought of as fundamental degrees of freedom could hold up to higher energies, becoming asymptotically safe. In this talk I will present the RG analysis of the pure bosonic model and the predictions about the contributions to the oblique S and T parameters. Moreover, I will also discuss the inclusion of fermions and the (possible) modification they introduce to the asymptotic safety picture.


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http://www.univie.ac.at/vienna.seminar /  2011,  E-mail: vienna.theor-physik@univie.ac.at