Title: Sigma-assisted natural composite Higgs 
Speaker: Dr. Diogo Buarque Franzosi (Chalmers University of Technology) 
Time: 3:00 pm Oct.31(Wednesday), 2018 
Place: 319 Theoretical Physics Division 

Abstract: 
Electroweak precision observables as well as more recent LHC measurements push Composite Higgs model into unnatural region, with the vacuum misalignment angle Sinq =v/f \lesssim 0.2. Such values are difficult to achieve from the typical interactions that determine the vacuum alignment. The speaker will show how the techni-sigma scalar excitation might alleviate this problem in a theory of Composite Higgs with a partially composite top quark. He will use unitarity arguments to estimate mass and couplings of this scalar state and discuss the possibility to observe it at the LHC. The work is based on arXiv:1809.09146.