7,778 research outputs found
Dark Matter and Collider Physics in Split-UED
Kaluza-Klein dark matter is an attractive weakly interacting massive particle
in universal extra dimension model. In the recent extension "split-UED",
annihilation of Kaluza-Klein dark matter with a mass range 600-1000 GeV
provides excellent fits to the recently observed excesses in cosmic electron
and positron fluxes of Pamela, ATIC and Fermi-LAT experiments. The cosmic
gamma-ray flux in the same process can be significant around 300 GeV, thus can
be observed or constrained by the forthcoming Fermi-LAT diffuse gamma-ray data.
The collider signal at the LHC is the resonance in the dijets channels and the
large missing energy in the missing energy plus jets.Comment: 3 pages, 6 figures, Talks given at 17th International Conference on
Supersymmetry and the Unification of Fundamental Interactions (SUSY09),
Boston, USA, 5-10 June 200
Split-UED and Dark Matter
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 ( 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.Comment: 4 pages, 3 figures, 1 tabl
Prospects for Triple Gauge Coupling Measurements at Future Lepton Colliders and the 14 TeV LHC
The production is the primary channel to directly probe the triple gauge
couplings. We first analyze the process at the
future lepton collider, China's proposed Circular Electron-Positron Collider
(CEPC). We use the five kinematical angles in this process to constrain the
anomalous triple gauge couplings and relevant dimension six operators at the
CEPC up to the order of magnitude of . The most sensible information
is obtained from the distributions of the production scattering angle and the
decay azimuthal angles. We also estimate constraints at the 14 TeV LHC, with
both 300 fb and 3000 fb integrated luminosity from the leading
lepton and azimuthal angle difference distributions in
the di-lepton channel. The constrain is somewhat weaker, up to the order of
magnitude of . The limits on the triple gauge couplings are
complementary to those on the electroweak precision observables and Higgs
couplings. Our results show that the gap between sensitivities of the
electroweak and triple gauge boson precision can be significantly decreased to
less than one order of magnitude at the 14 TeV LHC, and that both the two
sensitivities can be further improved at the CEPC.Comment: 36 pages, 5 figures, 8 tables, version to appear in JHE
Towards the fate of natural composite Higgs model through single search at the 8 TeV LHC
We analyze the observational potential of single production in both the
and decay channels at 8 TeV
LHC using an integrated luminosity of 25 . Our analysis is
based on a simplified model with minimal coset in which the
is a singlet of the unbroken SO(4). The single production, as a
consequence of electroweak symmetry breaking, is less kinematically suppressed,
associated with a light forward jet and has boosted decay products at the 8 TeV
LHC. Therefore it provides the most promising channel in searching for a heavy
. We have exploited the above kinematical features and used the jet
substructure method to reconstruct the boosted Higgs in decay channel. It
is shown that a strong constraint on the coupling () at the 95% C. L. can be obtained for GeV.Comment: 22 pages, 8 figures, 5 tables, refs added in v
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