Is natural higgsino-only dark matter excluded?

Baer, Howard and Barger, Vernon and Sengupta, Dibyashree and Tata, Xerxes (2018) Is natural higgsino-only dark matter excluded? In: EUROPEAN PHYSICAL JOURNAL C, 78 (10).

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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) similar to m(W,Z,h) similar to 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.

Item Type:	Journal Article
Publication:	EUROPEAN PHYSICAL JOURNAL C
Publisher:	SPRINGER
Additional Information:	Copy right for this article belong to SPRINGER
Department/Centre:	Division of Physical & Mathematical Sciences > Centre for High Energy Physics
Date Deposited:	14 Nov 2018 15:12
Last Modified:	14 Nov 2018 15:12
URI:	http://eprints.iisc.ac.in/id/eprint/61050

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