TY - JOUR
T1 - Dark matter and collider phenomenology of split-UED
AU - Chen, Chuan Ren
AU - Nojiri, Mihoko M.
AU - Park, Seong Chan
AU - Shu, Jing
AU - Takeuchi, Michihisa
PY - 2009
Y1 - 2009
N2 - 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 γ ≲ 20 GeV). Collider signatures of colored KK particles at the LHC, especially q 1q 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.
AB - 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 γ ≲ 20 GeV). Collider signatures of colored KK particles at the LHC, especially q 1q 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.
KW - Phenomenology of field Theories in higher dimensions
UR - http://www.scopus.com/inward/record.url?scp=70350043672&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=70350043672&partnerID=8YFLogxK
U2 - 10.1088/1126-6708/2009/09/078
DO - 10.1088/1126-6708/2009/09/078
M3 - Article
AN - SCOPUS:70350043672
SN - 1126-6708
VL - 2009
JO - Journal of High Energy Physics
JF - Journal of High Energy Physics
IS - 9
M1 - 078
ER -