Abstract
Abstract We consider the phenomenology at the Large Hadron Collider of new heavy vector-like quarks which couple mainly to the third generation quarks via Yukawa interactions, with special emphasis on non-standard doublet representations which are less constrained from present data. We also discuss in detail the flavour limits at tree level and loop level and implications of a generalised CKM mixing matrix to these cases.
Highlights
Heavy vector-like fermions are not present in the Standard Model (SM), they naturally arise near the electroweak scale in many extensions of new physics
We have discussed in detail new vector-like quarks which can mix with the standard model quarks without conflicting with current experimental limits
In particular we focused on a non standard doublet that contains a top partner and an exotic quark with electric charge 5/3
Summary
Heavy vector-like fermions are not present in the Standard Model (SM), they naturally arise near the electroweak scale in many extensions of new physics. Flavour hierarchies among SM masses for fermions and their mixings are most often generated through their dynamical mixing with vector-like fermions These particles are present in many models of new physics, like for example extra dimensional, Little Higgs and dynamical models. More recently the possibility of gauging the Standard Model flavour group requiring anomaly cancellation with the addition of new vector-like fermions was studied with explicit model constructions which show the possibility of a relatively low new gauge flavour bosons scale [1] In this case the vector-like quarks play an important role both for anomaly cancellation and for the mechanism of generation of fermion masses (see [2] for an example with left-right symmetry). Two appendices contain more detailed material concerning the expansion of the CKM matrix and the notations used for the meson mixing formalism
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