Dark matter and hierarchies from electroweak symmetry breaking
- Jefferson Laboratory of Physics, Harvard University, Cambridge, Massachusetts 02138 (United States)
A simple and well-motivated explanation for the origin of dark matter is that it consists of thermal relic particles that get their mass entirely through electroweak symmetry breaking. Furthermore, this possibility suggests an environmental explanation of the hierarchy between the weak and Planck scales and of the small value of the cosmological constant relative to the weak scale. In simple models with these features, the dark matter is a mixture of two Dirac neutrinos with opposite isospin, and so has suppressed coupling to the Z. Other minimal models of this form are also consistent with gauge coupling unification. We predict a dark matter (DM) mass of m{sub DM}{approx_equal}45 GeV or m{sub DM}{approx_equal}90-95 GeV and DM-neutron spin-independent cross sections {sigma}{sub DM-n}{approx}10{sup -6}-10{sup -8} pb. An enhancement of the galactic halo gamma ray and positron flux coming from annihilations of these particles is also expected across the {approx}1-100 GeV range.
- OSTI ID:
- 20713811
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 72, Issue 9; Other Information: DOI: 10.1103/PhysRevD.72.093005; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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