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Integrating Out New Fermions At One Loop, Andrei Angelescu, Peisi Huang
Integrating Out New Fermions At One Loop, Andrei Angelescu, Peisi Huang
Department of Physics and Astronomy: Faculty Publications
We present the fermionic universal one-loop effective action obtained by integrating out heavy vector-like fermions at one loop using functional techniques. Even though previous approaches are able to handle integrating out heavy fermions with non-chiral interactions, i.e. vanishing γ5 interaction terms, the computations proceed in a tedious manner that obscures a physical interpretation. We show how directly tackling the fermionic functional determinant not only allows for a much simpler and transparent computation, but is also able to account for chiral interaction terms in a simple, algorithmic way. Finally, we apply the obtained results to integrate out at one loop …