scholarly journals A three Higgs doublet model with symmetry-suppressed flavour changing neutral currents

2021 ◽  
Vol 2021 (11) ◽  
Author(s):  
Dipankar Das ◽  
P. M. Ferreira ◽  
António P. Morais ◽  
Ian Padilla-Gay ◽  
Roman Pasechnik ◽  
...  
Keyword(s):  
Higgs Doublet ◽  
Higgs Bosons ◽  
Flavour Changing Neutral Currents ◽  
Neutral Currents ◽  
The Future ◽  
Future Collider ◽  
Doublet Model

Abstract We construct a three-Higgs doublet model with a flavour non-universal U(1) × ℤ2 symmetry. That symmetry induces suppressed flavour-changing interactions mediated by neutral scalars. New scalars with masses below the TeV scale can still successfully negotiate the constraints arising from flavour data. Such a model can thus encourage direct searches for extra Higgs bosons in the future collider experiments, and includes a non-trivial flavour structure.

scholarly journals Higgs pair production in the CP-violating two-Higgs-doublet model

2017 ◽  
Vol 32 (34) ◽  
pp. 1746002 ◽  
Author(s):  
Ligong Bian ◽  
Ning Chen ◽  
Yun Jiang
Keyword(s):  
Higgs Boson ◽  
Pair Production ◽  
Cross Sections ◽  
Higgs Doublet ◽  
High Energy ◽  
Higgs Bosons ◽  
Mixing Angles ◽  
The Future ◽  
Doublet Model ◽  
Two Higgs Doublet Model

The SM-like Higgs pair production is discussed in the framework of the general CP-violating two-Higgs-doublet model, where we find that the CP-violating mixing angles can be related to the Higgs self-couplings. Therefore, the future experimental searches for Higgs boson pairs can be constrained by the improved precision of the electric dipole moment measurements. Based on a series of constraints of the SM-like Higgs boson signal fits, the perturbative unitarity and stability bounds to the Higgs potential, and the most recent LHC searches for heavy Higgs bosons, we suggest a set of benchmark models for the future high-energy collider searches for Higgs pair production. The [Formula: see text] colliders operating at [Formula: see text] are capable of measuring the Higgs cubic self-couplings of the benchmark models directly. We also estimate the cross sections of the resonance contributions to the Higgs pair productions for the benchmark models at the future LHC and SppC/FCC-hh runs.

scholarly journals The “96 GeV excess” at the LHC

2021 ◽  
pp. 2142018
Author(s):  
T. Biekötter ◽  
M. Chakraborti ◽  
S. Heinemeyer
Keyword(s):  
Higgs Boson ◽  
Decay Mode ◽  
Higgs Doublet ◽  
Higgs Bosons ◽  
Final State ◽  
Light Higgs Boson ◽  
Doublet Model ◽  
Higgs Boson Search

The CMS collaboration reported an intriguing [Formula: see text] (local) excess at 96 GeV in the light Higgs-boson search in the diphoton decay mode. This mass coincides with a [Formula: see text] (local) excess in the [Formula: see text] final state at LEP. We briefly review the proposed combined interpretations for the two excesses. In more detail, we review the interpretation of this possible signal as the lightest Higgs boson in the 2 Higgs Doublet Model with an additional real Higgs singlet (N2HDM). We show which channels have the best prospects for the discovery of additional Higgs bosons at the upcoming Run 3 of the LHC.

scholarly journals LEPTON-FLAVOR-VIOLATING τ DECAYS IN TWO-HIGGS-DOUBLET MODEL III

2010 ◽  
Vol 25 (25) ◽  
pp. 4827-4837 ◽  
Author(s):  
WEN-JUN LI ◽  
YING-YING FAN ◽  
LIN-XIA LÜ ◽  
SU-ZHI GAO ◽  
GONG-WEI LIU
Keyword(s):  
Perturbation Theory ◽  
Parameter Space ◽  
Chiral Perturbation Theory ◽  
Higgs Doublet ◽  
Higgs Bosons ◽  
Chiral Perturbation ◽  
Model Parameter ◽  
Lepton Flavor ◽  
Doublet Model ◽  
Two Higgs Doublet Model

We study the lepton-flavor-violating processes of τ- → μ-PP decays with PP = K+K-, [Formula: see text], π+π-, π0π0 in the framework of two-Higgs-doublet model III by virtue of the chiral perturbation theory. In this model, only three neutral Higgs bosons contribute to these decays. With the current experimental constraints, we show that (a) the contributions of the |λuu(dd)| term are very small for these four decays; (b) we get the correlation between |λss| and |λτμ|; for |λτμ| ~ 10–400, one has |λss| ~ 40–1; (c) in the existing model parameter space, Br (τ- → μ- K+K-) could reach the order of [Formula: see text], but Br (τ → μ-π+π-/π0π0) are too small to be observed.

scholarly journals Echoes of 2HDM inflation at the collider experiments

2020 ◽  
Vol 80 (9) ◽  
Author(s):  
Tanmoy Modak ◽  
Kin-ya Oda
Keyword(s):  
Large Hadron Collider ◽  
Linear Collider ◽  
Hadron Collider ◽  
International Linear Collider ◽  
Higgs Doublet ◽  
Lepton Colliders ◽  
The Future ◽  
Doublet Model ◽  
Near Degeneracy ◽  
Two Higgs Doublet Model

AbstractWe study the correlation between the constraints on general two Higgs doublet model from Higgs inflation and from collider experiments. The parameter space receives meaningful constraints from direct searches at the large hadron collider and from flavor physics if $$m_H$$ m H , $$m_A$$ m A , and $$m_{H^\pm }$$ m H ± are in the sub-TeV range, where H, A, and $$H^\pm $$ H ± are the CP even, CP odd, and charged Higgs bosons, respectively. We find that in the parameter region favored by the Higgs inflation, H, A, and $$H^\pm $$ H ± are nearly degenerate in mass. We show that such near degeneracy can be probed directly in the upcoming runs of the Large Hadron Collider, while the future lepton colliders such as the International Linear Collider and the future circular collider would provide complementary probes.

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