Detection Prospects for Majorana Fermion WIMPless Dark Matter

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Abstract

We consider both velocity-dependent and velocity-independent contributions to spin-dependent (SD) and spin-independent (SI) nuclear scattering (including one-loop corrections) of WIMPless dark matter, in the case where the dark matter candidate is a Majorana fermion. We find that spin-independent scattering arises only from the mixing of exotic squarks, or from velocity-dependent terms. Nevertheless (and contrary to the case of MSSM neutralino WIMPs), we find a class of models which cannot be detected through SI scattering, but can be detected at IceCube/DeepCore through SD scattering. We study the detection prospects for both SI and SD detection strategies for a large range of Majorana fermion WIMPless model parameters.

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Hadronic Uncertainties in the Elastic Scattering of Supersymmetric Dark Matter

Christopher Savage, Keith Olive, John Ellis (2008)

We review the uncertainties in the spin-independent and -dependent elastic scattering cross sections of supersymmetric dark matter particles on protons and neutrons. We propagate the uncertainties in quark masses and hadronic matrix elements that are related to the

$\pi$ -nucleon

$\sigma$ term and the spin content of the nucleon. By far the largest single uncertainty is that in spin-independent scattering induced by our ignorance of the

matrix elements linked to the

$\pi$ -nucleon

$\sigma$ term, which affects the ratio of cross sections on proton and neutron targets as well as their absolute values. This uncertainty is already impacting the interpretations of experimental searches for cold dark matter. {\it We plead for an experimental campaign to determine better the

$\pi$ -nucleon

$\sigma$ term.} Uncertainties in the spin content of the proton affect significantly, but less strongly, the calculation of rates used in indirect searches.

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Dark matter-motivated searches for exotic fourth-generation mirror quarks in Tevatron and early LHC data

Jonathan L. Feng, Jason Kumar, Shufang Su … (2010)

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Fermion WIMPless Dark Matter at DeepCore and IceCube

Vernon Barger, Enrico Maria Sessolo, Danny Marfatia … (2010)

We investigate the prospects for indirect detection of fermion WIMPless dark matter at the neutrino telescopes IceCube and DeepCore. The dark matter annihilating in the Sun is a hidden sector Majorana fermion that couples through Yukawa couplings to a connector particle and a visible sector particle, and it exhibits only spin-dependent scattering with nuclei via couplings to first generation quarks. We consider cases where the annihilation products are taus, staus, or sneutrinos of the three generations. To evaluate the muon fluxes incident at the detector, we propagate the neutrino spectra through the solar medium and to the Earth and account for the effects of neutrino oscillations, energy losses due to neutral- and charged-current interactions, and tau regeneration. We find that for the stau and sneutrino channels, a 5 yr 3

$\sigma$ detection of dark matter lighter than about 300 GeV is possible at IceCube for large Yukawa couplings or for dark matter and connector particles with similar masses. The tau channel offers far better detection prospects. However, due to its lower energy threshold and better muon background rejection capability, DeepCore is able to detect signals in all annihilation channels and for a wider range of dark matter masses.

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Publication date Created: 25 March 2011

Publication date Updated: 2011-08-03

Article

DOI: 10.1103/PhysRevD.84.014020

ArXiV ID: 1103.5068

SO-VID: edc9b66e-59af-4712-a6db-5baeac7d6167

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http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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Report No UH-511-1166-2011, UTTG-06-11, TCC-008-11

Journal reference Phys.Rev.D84:014020,2011

Comments 14 pages, 3 figures. v2: updated to match published version

Categories hep-ph astro-ph.CO astro-ph.HE

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Detection Prospects for Majorana Fermion WIMPless Dark Matter

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Most cited references 3

Hadronic Uncertainties in the Elastic Scattering of Supersymmetric Dark Matter

Dark matter-motivated searches for exotic fourth-generation mirror quarks in Tevatron and early LHC data

Fermion WIMPless Dark Matter at DeepCore and IceCube

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