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Messenger sneutrinos as cold dark matter

T. Han, R. Hempfling

Abstract

In models where supersymmetry breaking is communicated into the visible sector via gauge interactions the lightest supersymmetric particle is typically the gravitino which is too light to account for cold dark matter. We point out that the lightest messenger sneutrinos with mass in the range of one to three TeV may serve as cold dark matter over most of the parameter space due to one-loop electroweak radiative corrections. However, in the minimal model this mass range has been excluded by the direct dark matter searches. We propose a solution to this problem by introducing terms that explicitly violate the messenger number. This results in low detection rate for both direct and indirect searches and allows messenger sneutrinos to be a valid dark matter candidate in a wide region of SUSY parameter space.

Messenger sneutrinos as cold dark matter

Abstract

In models where supersymmetry breaking is communicated into the visible sector via gauge interactions the lightest supersymmetric particle is typically the gravitino which is too light to account for cold dark matter. We point out that the lightest messenger sneutrinos with mass in the range of one to three TeV may serve as cold dark matter over most of the parameter space due to one-loop electroweak radiative corrections. However, in the minimal model this mass range has been excluded by the direct dark matter searches. We propose a solution to this problem by introducing terms that explicitly violate the messenger number. This results in low detection rate for both direct and indirect searches and allows messenger sneutrinos to be a valid dark matter candidate in a wide region of SUSY parameter space.

Paper Structure

This paper contains 9 sections, 36 equations, 2 figures.

Table of Contents

  1. 1 Introduction
  2. 2 Messenger Sneutrinos as Cold Dark Matter
  3. 3 CDM Particle Detection
  4. 4 Conclusions
  5. 5 Acknowledgement
  6. Appendix A: $m_{ \phi^-}$--$m_{ \phi^0}$ mass difference
  7. Appendix B: Annihilation Rate and Relic Density
  8. Appendix C: sneutrino-nuclei Elastic Scattering via Higgs exchange
  9. References

Figures (2)

  • Figure 1: The relic density of $\phi^0$ as a function of $m_{\phi^0}$ in the limit that the mass of all MSSM particles are much lighter than $m_{ \phi^0}$. The two upper curves are for our symmetric phase calculation and the lower ones are for the broken phase.
  • Figure 2: The event rate for DM particles consisting of messenger sneutrinos in direct and indirect searches as a function of their mass, $m_{\phi^0}$.