Exceptional Supersymmetric Standard Model (Dr. Roman Nevzorov, Physics-UHM)

by Dr Roman Nevzorov (Physics-UHM)

Tuesday Nov 3, 2009, 3:00 PM → 4:30 PM Pacific/Honolulu

WAT 417A (University of Hawai'i, Manoa)

We present a self-consistent E_6 inspired supersymmetric (SUSY) model with an extra U(1)_N gauge symmetry under which right-handed neutrinos have zero charge, so that a conventional see-saw mechanism can be used to shed light on the origin of the mass hierarchy in the lepton sector. In this exceptional supersymmetric standard model (E_6 SSM) the \mu problem is solved in a similar way to the NMSSM, but without the accompanying problems of singlet tadpoles or domain walls. To ensure anomaly cancellation and gauge coupling unification the low energy matter content of the E_6 SSM involves three 27 representations of E_6 and a pair of Higgs-like SU(2) doublets from additional 27 and \overline{27}. Thus E_6 SSM predicts a Z' boson and extra exotic matter beyond the MSSM. We explore Z-Z' mixing, two--loop renormalization group (RG) flow of gauge and Yukawa couplings as well as the Higgs sector in the framework of this model. The lightest Higgs boson in the considered model can be significantly heavier than in the MSSM and NMSSM. We also consider generation of lepton and baryon asymmetries of the Universe in the E_6 SSM, study the particle spectrum within the constrained version of this model and analyze the production of the Z' and extra exotic matter at future colliders. Since exotic quarks in the E_6 SSM can be either diquarks or leptoquarks they may provide spectacular new physics signals at the LHC.
Organizer: John Learned