| DATE: |
2011-10-18 11:00 - 12:00 |
| PLACE: |
4th building 3F, Room 345 |
| TITLE: |
Dark matter in UED : the role of the second KK level |
| CONTACT: |
Masato Yamanaka, masato.yamanaka-AT-kek.jp |
| SPEAKER: |
Dr. Mitsuru Kanzaki (Toyama Universty) |
| LANGUAGE: |
English |
| URL: |
http://research.kek.jp/group/www-theory/schedule.html |
| ABSTRACT: |
（ABSTRACT）
We perform a complete calculation of the relic abundance of the KK-photon LKP in the universal extra dimension model including all coannihilation channels and all resonances. We show that the production of level 2 particles which decay dominantly into SM particles contribute significantly to coannihilation processes involving level 1 KK-leptons. As a result the preferred dark matter scale is increased to R^{-1}=1.3 TeV. A dark matter candidate at or below the TeV scale can only be found in the non-minimal model by reducing the mass splittings between the KK-particles and the LKP. The LKP nucleon scattering cross section is typically small, sigma < 10^{-10} pb, unless the KK-quarks are nearly degenerate with the LKP.
Reference: G. Belanger, M. Kakizaki, A. Pukhov, JCAP 02, 009 (2011). [arXiv:1012.2577 [hep-ph]].
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