# Impact of new physics on $B+L$ violation at colliders

## TL;DR

This paper investigates how exotic fermions charged under $SU(2)_L$ could influence $B+L$ violation signals at colliders, indicating potential beyond Standard Model physics effects on observable nonperturbative processes.

## Contribution

It introduces the impact of exotic fermions on $B+L$ violation cross-sections, highlighting non-exponential contributions and their potential to reveal new physics.

## Key findings

- Exotic fermions significantly affect $B+L$ violation cross-sections.
- Non-exponential contributions can be sizable due to exotic fermions.
- Implications for observing beyond Standard Model physics at colliders.

## Abstract

In the Standard Model, chiral electroweak anomalies predict nonperturbative interactions that violate baryon ($B$) plus lepton number ($L$). The potential observability of these processes at colliders has been amply discussed in the literature, mostly focusing on the impact of the accompanying boson emission, which contributes to the cross sections through an exponential function of the center-of-mass energy. We focus instead on the impact of exotic fermions charged under $SU(2)_L$, which not only can be emitted in these processes, but also affect the non-exponential contributions to the cross-sections. Estimating the latter using instanton techniques, we find sizable effects that suggest that if $B+L$-violating processes are ever seen at colliders, they may involve physics beyond the Standard Model.