Dark matter and collider phenomenology of split-UED

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

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number078
JournalJournal of High Energy Physics
Volume2009
Issue number9
DOIs
Publication statusPublished - 2009 Oct 22

Fingerprint

phenomenology
dark matter
quarks
antiprotons
leptons
cosmic rays
positrons
pions
signatures
gamma rays
anomalies
decay
electrons
energy

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

Cite this

Chen, Chuan Ren ; Nojiri, Mihoko M. ; Park, Seong Chan ; Shu, Jing ; Takeuchi, Michihisa. / Dark matter and collider phenomenology of split-UED. In: Journal of High Energy Physics. 2009 ; Vol. 2009, No. 9.
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Dark matter and collider phenomenology of split-UED. / Chen, Chuan Ren; Nojiri, Mihoko M.; Park, Seong Chan; Shu, Jing; Takeuchi, Michihisa.

In: Journal of High Energy Physics, Vol. 2009, No. 9, 078, 22.10.2009.

Research output: Contribution to journalArticle

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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.

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