Is natural higgsino-only dark matter excluded?

Journal Article · Wed Oct 17 00:00:00 EDT 2018 · European Physical Journal. C, Particles and Fields

DOI:https://doi.org/10.1140/epjc/s10052-018-6306-y· OSTI ID:1598036

Baer, Howard ^[1]; Barger, Vernon ^[2]; Sengupta, Dibyashree ^[3]; Tata, Xerxes ^[4]

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1. Univ. of Oklahoma, Norman, OK (United States); UH High Energy Physics Group
2. Univ. of Wisconsin, Madison, WI (United States)
3. Univ. of Oklahoma, Norman, OK (United States)
4. Indian Inst. of Science, Bangalore (India); Univ. of Hawaii, Honolulu, HI (United States)

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)~ m(W,Z,h)~100 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.

• Research Organization: Univ. of Hawaii, Honolulu, HI (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
• Grant/Contract Number: SC0010504
• OSTI ID: 1598036
• Alternate ID(s): OSTI ID: 22757358
• Journal Information: European Physical Journal. C, Particles and Fields, Journal Name: European Physical Journal. C, Particles and Fields Journal Issue: 10 Vol. 78; ISSN 1434-6044
• Publisher: Springer
• Country of Publication: United States
• Language: English

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