Anapole moment of the lightest neutralino in the cMSSM

Understand

We study the anapole moment of the lightest neutralino in the constrained Minimal Supersymmetric Standard Model (cMSSM).

• The electromagnetic anapole is the only allowed electromagnetic form factor for Majorana fermions, such as 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 anapole moment is different from zero albeit very small ($< 10^{-3}$ GeV$^{-2}$).