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Mixed dark matter in Universal Extra Dimension models with TeV scale WR and Z'

Ken Hsieh1, Rabindra N. Mohapatra1 and Salah Nasri2

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We show that in a class of universal extra dimension (UED) models that solves both the neutrino mass and proton decay problems using low scale left-right symmetry, the dark matter of the Universe consists of an admixture of KK photon and KK right-handed neutrinos. We present a full calculation of the dark matter density in these models taking into account the co-annihilation effects due to near by states such as the scalar partner of the KK photon as well as fermion states near the right-handed KK neutrino. Using the value of the relic CDM density, we obtain upper limits on R−1 of about 400-650 GeV and MZ' ≤ 1.5 TeV, both being accessible to LHC. For a region in this parameter space where the KK right-handed neutrino contributes significantly to the total relic density of dark matter, we obtain a lower bound on the dark matter-nucleon scattering cross section of 10−44 cm2, which can be probed by the next round of dark matter search experiments.

Keywords

Beyond Standard Model

Compactification and String Models

Cosmology of Theories beyond the SM

 

E-print Number: hep-ph/0610155

Cited: by |

Refers: to

PACS

95.35.+d Dark matter (stellar, interstellar, galactic, and cosmological)

14.60.St Non-standard-model neutrinos, right-handed neutrinos, etc.

12.60.-i Models beyond the standard model

98.80.Cq Particle-theory and field-theory models of the early Universe (including cosmic pancakes, cosmic strings, chaotic phenomena, inflationary universe, etc.)

Subjects

Gravitation and cosmology

Particle physics and field theory

Astrophysics and astroparticles

Dates

Issue 12 (December 2006)

Received 16 October 2006, accepted for publication 30 November 2006

Published 19 December 2006



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