Bonn 2010 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 19: Beyond the Standard Model (Theorie) III

T 19.3: Vortrag

Mittwoch, 17. März 2010, 14:30–14:45, HG XIV

Collider phenomenology of split-UED — Chuan-Ren Chen¹, Mihoko M. Nojiri^1,2,3, Seong Chang Park¹, Jing Shu¹, and •Michihisa Takeuchi^2,4 — ¹Institute for the Physics and Mathematics of the Universe, The University of Tokyo, Kashiwa-no Ha, Kashiwa City, Chiba 277-8568, Japan — ²Theory Group, KEK 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan — ³The Graduate University for Advanced Studies (SOKENDAI), 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan — ⁴Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto 606-8502, Japan

Split-universal extra dimension (split-UED), a recently suggested modification of universal extra dimension (UED) model, can nicely explain recent anomalies in cosmic-ray positrons and electrons observed by PAMELA and Fermi. In this model, Kaluza-Klein (KK) dark matters mainly annihilate into leptons because the hadronic branching fraction is highly suppressed by large KK quark masses and the antiproton flux agrees very well with the observation where no excess is found. Collider signatures of the colored KK particles at the LHC, especially q₁q₁ production, are studied in detail. Due to the large split in masses of KK quarks and other particles, hard p_T jets and missing E_T are generated, which make it possible to suppress the standard model background and to discover the signals.