Axion and Neutralinos from Supersymmetric Extensions of the Standard Model with anomalous U(1)'s

TL;DR

This paper explores supersymmetric models derived from string theory that include anomalous U(1) gauge interactions, demonstrating conditions for axion-like particles and neutralinos to be present in the spectrum, with implications for dark matter.

Contribution

It identifies conditions under which axion-like particles and neutralinos emerge in supersymmetric models with anomalous U(1) symmetries, extending previous models.

Findings

Axion-like particles appear with extra singlets in the spectrum.

Minimal superpotentials with charged singlets satisfy the conditions.

Dark matter includes axions and neutralinos with axino components.

Abstract

We analyze the conditions under which some supersymmetric generalizations of a class of models descending from string theory allow an axion in the physical spectrum, due to the presence of anomalous abelian gauge interactions. The gauge structure of these constructions involve the Stueckelberg supermultiplet and a supersymmetric version of the Wess-Zumino term for anomaly cancellation. While these conditions are not satisfied by the MSSM superpotential, we show that an axion-like particle appears in the spectrum if extra Standard Model singlets are present. We show that the minimal requirements are met by simple superpotentials in which the singlet superfield is charged under the anomalous U(1). The dark matter sector of these models include an axion and several neutralinos with an axino component.