Toroidal dipole moment of the lightest neutralino in the cMSSM

TL;DR

This paper investigates the electromagnetic property, specifically the toroidal dipole moment, of the lightest neutralino in the cMSSM, highlighting its non-zero but very small value across the parameter space relevant for dark matter.

Contribution

It provides the first detailed calculation of the neutralino's toroidal dipole moment within the cMSSM, showing it is non-zero and very small, with potential implications for dark matter detection.

Findings

Toroidal dipole moment is non-zero across the parameter space.

Maximum value of the dipole moment is around 10^{-3} GeV^{-2}.

Values are well below current experimental bounds.

Abstract

We study the toroidal dipole moment of the lightest neutralino in the constrained Minimal Supersymmetric Standard Model. The toroidal dipole moment is the only electromagnetic property of the neutralino. Since the neutralino is the LSP in many versions of the MSSM and therefore a candidate for dark matter, its characterization through its electromagnetic properties is important both for particle physics and for cosmology. We perform a scan in the parameter space of the cMSSM and find that the toroidal dipole moment is different from zero, albeit very small, in all the parameter space, and reaches a value around $10^{-3} \mathrm{GeV}^{-2}$ in a particular region of the parameter space, well below experimental bounds.