107 research outputs found
Single and pair production of MSSM Higgs bosons as a probe of scalar-pseudoscalar mixing at e+e- colliders
We study the associated production of the neutral CP--odd Higgs boson
with a neutral gauge boson as well as single production of via
at the one loop level in the Minimal
Supersymmetric Standard Model (MSSM). We show that the MSSM cross--section may
be enhanced by light SUSY particles. Then we study the production processes
, and in the context of
the MSSM with scalar-pseudoscalar mixing. In a given channel we show that the
cross--section for all i (=1,2,3) can be above 0.1 fb provided M_{H_{2,3}}\la
300 GeV. This should be detectable at a Next Linear Collider and would provide
evidence for scalar--pseudoscalar mixing.Comment: 7 pages, latex, 2 eps figures, preprints LPHEA/2002-05,
MPI-PhT/2002-64, Talk given at the 10th International Conference on
Supersymmetry and Unification of Fundamental Interactions, DESY, Hamburg,
Germany, June 17--23, 200
Effect of Fourth Generation CP Phase on b\to s Transitions
We study the effect of a sequential fourth generation on b\to s gamma, B_s
mixing, B\to K^{(*)}\ell^+\ell^-, X_s\ell^+\ell^- and \phi K_S, taking into
account the presence of a new CP phase in quark mixing. We find that the
effects via electromagnetic and strong penguins, such as in b\to s gamma or CP
violation in B\to \phi K_S, are rather mild, but impact via box or Z penguins
is quite significant. Not only can one have much larger than expected B_s
mixing, even if it is measured near the present limit, mixing dependent CP
violation could become maximal. For electroweak penguin modes, the fourth
generation can provide the enhancement that perhaps may be needed, while the
m_{\ell^+\ell^-} dependence of the forward-backward asymmetry in B\to
K^{*}\ell^+\ell^- can further probe for the fourth generation. These effects
can be studied in detail at the B factories and the Tevatron.Comment: 8 pages, latex, 9 eps figures, one reference added, to appear in EPJ
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
Bosonic Decays of Charged Higgs Bosons in a 2HDM Type-I
In this study, we focus on the bosonic decays of light charged Higgs bosons
in the 2-Higgs Doublet Model (2HDM) Type-I. We quantify the Branching Ratios
(BRs) of the and channels and show that
they could be substantial over several areas of the parameter space of the 2HDM
Type-I that are still allowed by Large Hadron Collider (LHC) and other
experimental data as well as theoretical constraints. We suggest that and/or could be used as a feasible discovery
channel alternative to .Comment: 6 pages, 4 figures, Discussion extended, typos corrected and
references adde
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