5,207 research outputs found
Higgs-dilaton(radion) system confronting the LHC Higgs data
We consider the Higgs-dilaton(radion) system using the trace of
energy-momentum tensor () with the full Standard Model (SM) gauge
symmetry , and find out
that the resulting phenomenology for the Higgs-dilaton(radion) system is
distinctly different from the earlier studies based on the with
the unbroken subgroup of
. After electroweak symmetry breaking (EWSB), the SM Higgs boson
and dilaton(radion) will mix with each other, and there appear two Higgs-like
scalar bosons and the Higgs-dilaton mixing changes the scalar phenomenology in
interesting ways. The signal strengths for the -initiated channels could be
modified significantly compared with the SM predictions due to the QCD scale
anomaly and the Higgs-dilaton(radion) mixing, whereas anomaly contributions are
almost negligible for other channels. We also discuss the self-couplings and
the signal strengths of the GeV scalar boson in various channels and
possible constraints from the extra light/heavy scalar boson. The
Higgs-dilaton(radion) system considered in this work has a number of
distinctive features that could be tested by the upcoming LHC running and at
the ILC.Comment: Minor corrections, including a few new figures, version appearing in
Physics Letters
AdS/QCD approach to the scale-invariant extension of the standard model with a strongly interacting hidden sector
In this paper, we revisit a scale-invariant extension of the standard model
(SM) with a strongly interacting hidden sector within AdS/QCD approach. Using
the AdS/QCD, we reduce the number of input parameters to three, {\it i.e.}
hidden pion decay constant, hidden pion mass and that is defined as
the ratio of the vacuum expectation values (VEV) of the singlet scalar field
and the SM Higgs boson. As a result, our model has sharp predictability. We
perform the phenomenological analysis of the hidden pions which is one of the
dark matter (DM) candidates in this model. With various theoretical and
experimental constraints we search for the allowed parameter space and find
that both resonance and non-resonance solutions are possible. Some typical
correlations among various observables such as thermal relic density of hidden
pions, Higgs boson signal strengths and DM-nucleon cross section are
investigated. We provide some benchmark points for experimental tests.Comment: minor corrections, version appeared in JHE
- …