  Chiral electroweak anomalies predict fermion interactions that violate baryon
($B$) and lepton number ($L$), and can be dressed with large numbers of Higgs
and gauge bosons. The estimation of the total $B+L$ violating rate from an
initial two-particle state --potentially observable at colliders-- has been the
subject of an intense discussion, mainly centered on the resummation of boson
emission, which is believed to contribute to the cross-section with an
exponential function of the energy, yet with an exponent (the "holy-grail"
function) which is not fully known in the energy range of interest. In this
article we focus instead on the effect of fermions beyond the Standard-Model
(SM) in the polynomial contributions to the rate. It is shown that $B+L$
processes involving the new fermions have a polynomial contribution that can be
several orders of magnitude greater than in the SM, for high centre-of-mass
energies and light enough masses. We also present calculations that hint at a
simple dependence of the holy grail function on the heavy fermion masses. Thus,
if anomalous $B+L$ violating interactions are ever detected at high-energy
colliders, they could be associated with new physics.
