New Physics Opportunities in Triangle Singularity

TL;DR

This paper explores how loop-induced processes involving new physics particles can produce triangular singularities at high-energy colliders, leading to observable Standard Model final states and extending the potential for new physics discovery.

Contribution

It demonstrates that new physics particles can induce triangular singularities in collider processes, providing novel signatures for experimental detection.

Findings

Triangular singularities can occur at high energies with new physics particles.

Such singularities can produce visible Standard Model final states.

The paper identifies specific scenarios in supersymmetric and extended Higgs models.

Abstract

We show that loop-induced processes involving new physics particles can readily satisfy Landau Equation and trigger triangular singularities at high energy colliders, leading to fully visible Standard Model final states. Four-particle vertices in new physics allow triangular singularity diagrams to evade large virtuality suppression. In addition, a $t$-channel triangular singularity can also occur in particle scattering processes that may extend to low momentum exchange. We discuss several typical scenarios in supersymmetric and extended Higgs models, then identify the singular component in the loop-integral amplitude at specific external momentum points.