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T: Teilchenphysik

T 503: Kosmologie II

T 503.1: Talk

Thursday, March 30, 2006, 16:20–16:40, HG2-HS5

Significant effects of second KK particles on LKP dark matter physics — •Mitsuru Kakizaki^1,2, Shigeki Matsumoto³, Yoshio Sato⁴, and Masato Senami² — ¹Physikalisches Institut der Universitaet Bonn, Nussallee 12, 53115 Bonn, Germany — ²ICRR, University of Tokyo, Kashiwa 277-8582, Japan — ³Theory Group, KEK, Oho 1-1, Tsukuba, Ibaraki 305-0801, Japan — ⁴Department of Physics, Saitama University, Saitama 338-8570, Japan

We point out that Kaluza-Klein (KK) dark matter physics is drastically affected by second KK particles. In particular, we reevaluate the annihilation cross section and thermal relic density of the KK dark matter quantitatively in universal extra dimensions, in which all the standard model particles propagate. In these models, the first KK mode of photon is a viable dark matter candidate by virtue of KK-parity. We demonstrate that the KK dark matter annihilation cross section can be enhanced, compared with the tree level cross section mediated only by first KK particles. The dark matter mass consistent with the WMAP observation is increased.