Flipped $g_\mu-2$

TL;DR

This paper explores how a flipped SU(5) GUT model allows for a supersymmetric contribution to the muon anomalous magnetic moment that could explain the experimental discrepancy while remaining consistent with collider constraints.

Contribution

It demonstrates that in flipped SU(5), the independence of certain gaugino and sfermion masses enables a viable explanation for the muon g-2 anomaly with detectable signatures.

Findings

Lightest neutralino and right-handed smuon can be light enough to explain g-2 discrepancy.

Other gauginos and sfermions can be heavy, evading LHC detection.

Potential detectability at LHC and future colliders.

Abstract

We analyze the possible magnitude of the supersymmetric contribution to $g_\mu - 2$ in a flipped SU(5) GUT model. Unlike other GUT models which are severely constrained by universality relations, in flipped SU(5) the U(1) gaugino mass and the soft supersymmetry-breaking masses of right-handed sleptons are unrelated to the other gaugino, slepton and squark masses. Consequently, the lightest neutralino and the right-handed smuon may be light enough to mitigate the discrepancy between the experimental measurement of $g_\mu - 2$ and the Standard Model calculation, in which case they may be detectable at the LHC and/or a 250 GeV $e^+ e^-$ collider, whereas the other gauginos and sfermions are heavy enough to escape detection at the LHC.