Goldstini Can Give the Higgs a Boost

TL;DR

This paper explores how multiple supersymmetry-breaking sectors introduce goldstini, significantly altering LOSP decay patterns and enabling enhanced Higgs production in collider experiments.

Contribution

It demonstrates that goldstini can dominate LOSP decays, especially to Higgs bosons, due to additional operators unconstrained by the supercurrent, especially with R symmetry.

Findings

LOSP can decay predominantly to Higgs and goldstino.

Goldstini enable new decay channels not constrained by supercurrent.

Enhanced Higgs production in SUSY cascades due to goldstini operators.

Abstract

Supersymmetric collider phenomenology depends crucially on whether the lightest observable-sector supersymmetric particle (LOSP) decays, and if so, what the LOSP decay products are. For instance, in SUSY models where the gravitino is lighter than the LOSP, the LOSP decays to its superpartner and a longitudinal gravitino via supercurrent couplings. In this paper, we show that LOSP decays can be substantially modified when there are multiple sectors that break supersymmetry, where in addition to the gravitino there are light uneaten goldstini. As a particularly striking example, a bino-like LOSP can have a near 100% branching fraction to a higgs boson and an uneaten goldstino, even if the LOSP has negligible higgsino fraction. This occurs because the uneaten goldstino is unconstrained by the supercurrent, allowing additional operators to mediate LOSP decay. These operators can be enhanced in the presence of an R symmetry, leading to copious boosted higgs production in SUSY cascade decays.