1,276 research outputs found
Higgs pair production via gluon fusion in the Two-Higgs-Doublet Model
We study the production of Higgs boson pairs via gluon fusion at the LHC in
the Two-Higgs-Doublet Model. We present predictions at NLO accuracy in QCD,
matched to parton showers through the MC@NLO method. A dedicated reweighting
technique is used to improve the NLO calculation upon the infinite top-mass
limit. We perform our calculation within the MadGraph5_aMC@NLO framework, along
with the 2HDM implementation based on the NLOCT package. The inclusion of the
NLO corrections leads to large K-factors and significantly reduced theoretical
uncertainties. We examine the seven 2HDM Higgs pair combinations using a number
of representative 2HDM scenarios. We show how the model-specific features
modify the Higgs pair total rates and distribution shapes, leading to trademark
signatures of an extended Higgs sector.Comment: 39 pages, 10 figures, 11 tables, matching published versio
The Higgs singlet extension at LHC Run 2
We discuss the current status of theoretical and experimental constraints on
the real Higgs singlet extension of the Standard Model. For the second neutral
(non-standard) Higgs boson the mass range up to 1 TeV accessible at past and
current collider experiments is considered. We furthermore discuss electroweak
corrections to the H to hh partial decay width within this model.Comment: 5 pages, 3 figures, Proceedings of the XXIV International Workshop on
Deep-Inelastic Scattering and Related Subject
Gauge-independent Renormalization of the N2HDM
The Next-to-Minimal 2-Higgs-Doublet Model (N2HDM) is an interesting benchmark
model for a Higgs sector consisting of two complex doublet and one real singlet
fields. Like the Next-to-Minimal Supersymmetric extension (NMSSM) it features
light Higgs bosons that could have escaped discovery due to their singlet
admixture. Thereby, the model allows for various different Higgs-to-Higgs decay
modes. Contrary to the NMSSM, however, the model is not subject to
supersymmetric relations restraining its allowed parameter space and its
phenomenology. For the correct determination of the allowed parameter space,
the correct interpretation of the LHC Higgs data and the possible distinction
of beyond-the-Standard Model Higgs sectors higher order corrections to the
Higgs boson observables are crucial. This requires not only their computation
but also the development of a suitable renormalization scheme. In this paper we
have worked out the renormalization of the complete N2HDM and provide a scheme
for the gauge-independent renormalization of the mixing angles. We discuss the
renormalization of the soft breaking parameter and
the singlet vacuum expectation value . Both enter the Higgs self-couplings
relevant for Higgs-to-Higgs decays. We apply our renormalization scheme to
different sample processes such as Higgs decays into bosons and decays into
a lighter Higgs pair. Our results show that the corrections may be sizeable and
have to be taken into account for reliable predictions
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