Singlet Scalar Top Partners from Accidental Supersymmetry

TL;DR

This paper introduces a four-dimensional model with singlet scalar top partners protected by a $Z_3$ symmetry, providing a natural solution to the hierarchy problem with distinctive collider signatures.

Contribution

It proposes a novel accidental supersymmetry model with complete singlet scalars and hidden sectors, offering more parametric freedom and unique phenomenology compared to existing models.

Findings

The model successfully cancels top loop quadratic divergences.

Hidden sector glueballs have longer decay lengths, affecting collider signatures.

Production of hidden sector particles leads to quirk or squirk bound states.

Abstract

We present a model wherein the Higgs mass is protected from the quadratic one-loop top quark corrections by scalar particles that are complete singlets under the Standard Model (SM) gauge group. While bearing some similarity to Folded Supersymmetry, the construction is purely four dimensional and enjoys more parametric freedom, allowing electroweak symmetry breaking to occur easily. The cancelation of the top loop quadratic divergence is ensured by a $Z_3$ symmetry that relates the SM top sector and two hidden top sectors, each charged under its own hidden color group. In addition to the singlet scalars, the hidden sectors contain electroweak-charged supermultiplets below the TeV scale, which provide the main access to this model at colliders. The phenomenology presents both differences and similarities with respect to other realizations of neutral naturalness. Generally, the glueballs of hidden color have longer decay lengths. The production of hidden sector particles results in quirk or squirk bound states, which later annihilate. We survey the possible signatures and corresponding experimental constraints.