Abstract
The requirement of electroweak naturalness in supersymmetric (SUSY) models of particle physics necessitates light higgsinos not too far from the weak scale characterized by m_{weak}sim m_{W,Z,h}sim 100hbox { GeV}. On the other hand, LHC Higgs mass measurements and sparticle mass limits point to a SUSY breaking scale in the multi-TeV regime. Under such conditions, the lightest SUSY particle is expected to be a mainly higgsino-like neutralino with non-negligible gaugino components (required by naturalness). The computed thermal WIMP abundance in natural SUSY models is then found to be typically a factor 5–20 below its measured value. To gain concordance with observations, either an additional DM particle (the axion is a well-motivated possibility) must be present or additional non-thermal mechanisms must augment the neutralino abundance. We compare present direct and indirect WIMP detection limits to three natural SUSY models based on gravity-, anomaly- and mirage-mediation. We show that the case of natural higgsino-only dark matter where non-thermal production mechanisms augment its relic density, is essentially excluded by a combination of direct detection constraints from PandaX-II, LUX and Xenon-1t experiments, and by bounds from Fermi-LAT/MAGIC observations of gamma rays from dwarf spheroidal galaxies.
Highlights
125 GeV [1,2] seems to require TeV-scale highly mixed top squarks, at least in the framework of the Minimal Supersymmetric Standard Model, or MSSM [3,4,5,6,7]
We examine expectations for SUSY WIMP dark matter from three different, well-motivated classes of natural SUSY models that lead to qualitatively different patterns of gaugino and higgsino masses which in turn determines the nature of the SUSY WIMP
The Fermi-LAT/MAGIC channel to be compared against is their result for annihilation ito W W since the gammas come primarily from V → qq → π 0s → γ γ and these configurations are similar for V = W or V = Z
Summary
125 GeV [1,2] seems to require TeV-scale highly mixed top squarks, at least in the framework of the Minimal Supersymmetric Standard Model, or MSSM [3,4,5,6,7]. TeV-scale highly mixed top squarks [28] This latter condition lifts the Higgs mass to mh ∼ 125 GeV. 1. Gravity-mediated SUSY breaking models, as exemplified by the two-extra-parameter natural non-universal. For nAMSB, one expects weak scale gaugino masses in the ratio M1:M2:M3 ∼ 3:1:8 but with μ < M(gauginos) so that a higgsino-like neutralino (mixed with some wino component) is the lightest.
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