156 research outputs found
A strong first order phase transition in the UMSSM
In this work, the electroweak phase transition (EWPT) strength has been
investigated within the extended Minimal Supersymmetric Standard Model
(UMSSM) without introducing any exotic fields. We found that the EWPT could be
strongly first order for reasonable values of the lightest Higgs and neutralino
masses.Comment: talk presented in PASCOS2010, Valencia, Spain from 19-23 Jul. 201
Higgs Phenomenology in the Two-Singlet Model
We study the phenomenology of the Standard Model (SM) Higgs sector extended
by two singlet scalars. The model predicts two CP-even scalars which
are a mixture of doublet and singlet components as well as a pure singlet
scalar which is a dark matter candidate. We show that the model can
satisfy the relic density and direct detection constraints as well as all the
recent ATLAS and CMS measurements. We also discuss the effect of the extra
Higgs bosons on the different Higgs triple couplings ,
. A particular attention is given to the triple self-coupling of the
SM-like Higgs where we found that the one loop corrections can reach is
some cases. We also discuss some production mechanisms for and
at the LHC as well as at the future International Linear Collider. It is found
that the production cross section of a pair of SM-like Higgs bosons could be
much larger than the corresponding one in the SM and would reveal physics
beyond the SM if observable. We also show that in this model the branching
ratio of the SM-like Higgs decaying to two singlet scalars could be of the
order of , therefore the production of the SM Higgs followed by its decay
to a pair of singlets would be an important source of production of singlet
scalars.Comment: 27 pages, 8 figures, 2 tables, published versio
Triple Higgs Coupling as a Probe of the Twin-Peak Scenario
In this letter, we investigate the case of a twin peak around the observed
125 GeV scalar resonance, using di-Higgs production processes at both LHC and
Linear Colliders. We have shown that both at LHC and Linear
Collider the triple Higgs couplings play an important role to identify this
scenario; and also that this scenario can be distinguishable from any Standard
Model extension by extra massive particles which might modify the triple Higgs
coupling. We also introduce a criterion that can be used to ruled out the twin
peak scenario.Comment: 6 pages, 4 figures, typos corrected, some results are modified &
version published in PL
A Radiative Model for the Weak Scale and Neutrino Mass via Dark Matter
We present a three-loop model of neutrino mass in which both the weak scale
and neutrino mass arise as radiative effects. In this approach, the scales for
electroweak symmetry breaking, dark matter, and the exotics responsible for
neutrino mass, are related due to an underlying scale-invariance. This
motivates the otherwise-independent O(TeV) exotic masses usually found in
three-loop models of neutrino mass. We demonstrate the existence of viable
parameter space and show that the model can be probed at colliders, precision
experiments, and dark matter direct-detection experiments.Comment: 24 pages, 7 figures; v2 Published versio
The Scale-Invariant Scotogenic Model
We investigate a minimal scale-invariant implementation of the scotogenic
model and show that viable electroweak symmetry breaking can occur while
simultaneously generating one-loop neutrino masses and the dark matter relic
abundance. The model predicts the existence of a singlet scalar (dilaton) that
plays the dual roles of triggering electroweak symmetry breaking and sourcing
lepton number violation. Important constraints are studied, including those
from lepton flavor violating effects and dark matter direct-detection
experiments. The latter turn out to be somewhat severe, already excluding large
regions of parameter space. None the less, viable regions of parameter space
are found, corresponding to dark matter masses below (roughly) 10 GeV and above
200 GeV.Comment: 21 pages, 8 figures; v2 JHEP versio
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