Dark matter and collider phenomenology of split-UED

Chuan-Ren Chen; Jing Shu; Michihisa Takeuchi; Mihoko M. Nojiri; Seong Chan Park

Dark matter and collider phenomenology of split-UED

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arxiv 0903.1971 v1 pith:LRUX6S4C submitted 2009-03-11 hep-ph

Chuan-Ren Chen , Mihoko M. Nojiri , Seong Chan Park , Jing Shu , Michihisa Takeuchi This is my paper · ORCID

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We explicitly show that split-universal extra dimension (split-UED), a recently suggested extension of universal extra dimension (UED) model, can nicely explain recent anomalies in cosmic-ray positrons and electrons observed by PAMELA and ATIC/PPB-BETS. 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 . The flux of cosmic gamma-rays from pion decay is also highly suppressed and hardly detected in low energy region (E<20 GeV). Collider signatures of colored KK particles at the LHC, especially q_1 q_1 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 discover the signals.

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Revisiting Universal Extra-Dimension Model with Gravity Mediated Decays
hep-ph 2024-12 conditional novelty 5.0 of 10

Existing LHC data exclude fat-brane mUED compactification scales below about 3 TeV, and ML-tagged searches at 500 fb^-1 could extend the reach to roughly 3.2 to 3.4 TeV.

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