Muon g-2 and Dark Matter suggest Non-Universal Gaugino Masses: $\mathbf{SU}(5)\times {\mathbf{A}}_4$ case study at the LHC

Abstract

We argue that in order to account for the muon anomalous magnetic moment $g-2$, dark matter and LHC data, non-universal gaugino masses $M_i$ at the high scale are required in the framework of the Minimal Supersymmetric Standard Model (MSSM). We also need a right-handed smuon ${\tilde{\mu }}_R$ with a mass around 100 GeV, evading LHC searches due to the proximity of a neutralino ${\tilde{\chi }}_1^0$ several GeV lighter which allows successful dark matter. We discuss such a scenario in the framework of an $SU(5)$ Grand Unified Theory (GUT) combined with $A_4$ family symmetry, where the three $\overline{5}$ representations form a single triplet of $A_4$ with a unified soft mass $m_F$, while the three $10$ representations are singlets of $A_4$ with independent soft masses $m_{T1},m_{T2},m_{T3}$. Although $m_{T2}$ (and hence ${\tilde{\mu }}_R$) may be light, the muon $g-2$ and relic density also requires light $M_1\simeq 250$ GeV, which is incompatible with universal gaugino masses due to LHC constraints on $M_2$ and $M_3$ arising from gaugino searches. After showing that universal gaugino masses $M_{1/2}$ at the GUT scale are excluded by gluino searches, we provide a series of benchmarks which show that while $M_1=M_2\ll M_3$ is also excluded by chargino searches, $M_1<M_2\ll M_3$ is currently allowed. Even this scenario is almost excluded by the tension between the muon $g-2$, relic density, Dark Matter direct detection and LHC data. The surviving parameter space is characterised by a higgsino mass $\mu \approx -300$ GeV, as required by the muon $g-2$. The LHC will be able to fully test this scenario with the upgraded luminosity via muon-dominated tri- and di-lepton signatures resulting from higgsino dominated ${\tilde{\chi }}_1^{\pm }{\tilde{\chi }}_2^0$ and ${\tilde{\chi }}_1^{+}{\tilde{\chi }}_1^{-}$ production.

arXiv comment23 pages, 10 figures

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