摘要: Motivated by the recent observation of the high energy electron and positron excesses in cosmic
ray by PAMELA and ATIC/PPB-BETS, we suggest an anomaly-free scenario for the universal extra
dimension that localizes the SM quarks and splits the spectrum of KK quarks from KK leptons.
When the SM quarks are “well localized” at the boundaries, the most stringent bound of the model
(1/R > 510 GeV) comes from the resonance search for the Tevatron dijet channels. Even at the
early stage of LHC, one can discover the second KK gluon for masses up to 4 TeV.