摘要: 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 (Eγ . 20 GeV). Collider signatures of 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 pT jets and missing ET are generated, which make it possible
to suppress the standard model background and discover the signals.