Composite fermions in Electroweak Symmetry Breaking

by Duccio Pappadopulo (EPFL)

Monday 8 Dec 2008, 14:00 → 15:00 Europe/Zurich

EPFL, Salle 727 du BSP, EPFL

If the electroweak symmetry is broken by some unspecified strong dynamics, composite fermions may exist with definite transformation properties under $SU(2)_L\times SU(2)_R/SU(2)_{L+R}$ and may play a role in giving masses by mixing to all the standard quarks and leptons. Assuming this to be the case, we analyze the role of Singlets, Doublets and Triplets in the ElectroWeak Precision Tests and in Flavour Physics. Doublets and Triplets are generically disfavoured. In the Singlet case, we specify the breaking patterns of the flavour group that allow to keep the CKM picture of flavour physics and we discuss the effects of the mixing between composite and elementary fermions. These mixings affect in particular the LHC phenomenology of the composite fermions.