Flipped mathbf {g_mu - 2}

John Ellis,Jason L Evans,Keith A Olive,Natsumi Nagata,Dimitri V Nanopoulos

doi:10.1140/epjc/s10052-021-09829-8

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.

Highlights

This dampening of supersymmetric enthusiasm is not entirely warranted
Unlike other grand unification (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
We show in this paper that a significant supersymmetric contribution is possible in one specific GUT model, 1 See [49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66] for other supersymmetric interpretations of the gμ − 2 measurements

Summary

Introduction

This dampening of supersymmetric enthusiasm is not entirely warranted. The absence at the LHC so far of squarks and gluinos does not bear directly on the possible masses of smuons and their sneutrino, the lighter chargino and the lightest neutralino, which would likely give the largest supersymmetric contributions to gμ − 2.

Results

Conclusion