Abstract :
[en] In this work we study which are the minimal anomaly-free chiral fermion sets, beyond the standard
model, that lead to vector-like particles with respect to SU(3) and U(1)em after symmetry
breaking. We focus on fermion multiplets with SU(3) and SU(2) dimensions less than or equal to
10 and 5, respectively. Furthermore, we study whether the addition of such chiral fermions allows
for gauge coupling unification, at some high scale compatible with proton decay limits.
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