Composite Vectorlike Fermions

TL;DR

This paper proposes a dynamical mechanism for generating composite vectorlike fermions from elementary chiral fermions and scalars, analyzing their properties and interactions in the large N limit, with implications for physics beyond the Standard Model.

Contribution

It introduces a novel dynamical mechanism for composite vectorlike fermion formation and analyzes their properties and interactions at large N, providing insights for beyond Standard Model physics.

Findings

Composite fermion mass is much smaller than the compositeness scale near critical coupling.

Contact interactions among four composite fermions scale as 1/N.

The mechanism offers a new pathway for composite fermions in BSM theories.

Abstract

We study a dynamical mechanism that generates a composite vectorlike fermion, formed by the binding of an $N$-tuplet of elementary chiral fermions to an $N$-tuplet of scalars. Deriving the properties of the composite fermion in the large $N$ limit, we show that its mass is much smaller than the compositeness scale when the binding coupling is near a critical value. We compute the contact interactions involving four composite fermions, and find that their coefficients scale as $1/N$. Physics beyond the Standard Model may include composite vectorlike fermions arising from this mechanism.