scholarly journals The LHC searches for heavy neutral Higgs bosons by jet substructure analysis

2016 ◽  
Vol 31 (33) ◽  
pp. 1644009 ◽  
Author(s):  
Ning Chen
Keyword(s):  
Top Quarks ◽  
Higgs Doublet ◽  
Higgs Bosons ◽  
Jet Substructure ◽  
High Luminosity ◽  
Decay Modes ◽  
Substructure Analysis ◽  
Doublet Model ◽  
Two Higgs Doublet Model ◽  
Search Modes

The two-Higgs-doublet model contains extra Higgs bosons with mass ranges spanning from several hundred GeV to about 1 TeV. We study the possible experimental searches for the neutral Higgs bosons of [Formula: see text] and [Formula: see text] at the future high-luminosity LHC runs. Besides of the conventional search modes that are inspired by the supersymmetric models, we discuss two search modes which were not quite addressed previously. They are the decay modes of [Formula: see text] and [Formula: see text]. Thanks to the technique of tagging boosted objects of SM-like Higgs bosons and top quarks, we show the improved mass reaches for heavy neutral Higgs bosons with masses up to [Formula: see text]. The modes proposed here are complementary to the conventional experimental searches motivated by the MSSM.

scholarly journals Analysis of Top Quark Pair Production Signal from Neutral 2HDM Higgs Bosons at LHC

2018 ◽  
Vol 2018 ◽  
pp. 1-8
Author(s):  
Majid Hashemi ◽  
Mahbobeh Jafarpour
Keyword(s):  
Higgs Boson ◽  
Pair Production ◽  
Top Quark ◽  
Top Quarks ◽  
Higgs Doublet ◽  
Higgs Bosons ◽  
Type I ◽  
Final State ◽  
Doublet Model ◽  
Two Higgs Doublet Model

In this paper, the top quark pair production events are analyzed as a source of neutral Higgs bosons of the two Higgs doublet model type I at LHC. The production mechanism is pp→H/A→tt¯ assuming a fully hadronic final state through t→Wb→jjb. In order to distinguish the signal from the main background which is the standard model tt¯, we benefit from the fact that the top quarks in signal events acquire large Lorentz boost due to the heavy neutral Higgs boson. This feature leads to three collinear jets (a fat jet) which is a discriminating tool for identification of the top quarks from the Higgs boson resonances. Events with two identified top jets are selected and the invariant mass of the top pair is calculated for both signal and background. It is shown that the low tan β region has still some parts which can be covered by this analysis and has not yet been excluded by flavor physics data.

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 The Higgs potential in 2HDM extended with a real triplet scalar: A roadmap

2021 ◽  
pp. 2150131
Author(s):  
B. Ait-Ouazghour ◽  
M. Chabab
Keyword(s):  
Decay Channel ◽  
Higgs Doublet ◽  
Higgs Potential ◽  
Mixing Angle ◽  
Decay Modes ◽  
Higgs Decay ◽  
Clear Insight ◽  
Doublet Model ◽  
Two Higgs Doublet Model ◽  
Comprehensive Study

We perform a comprehensive study of the Higgs potential of the two Higgs doublet model extended by a real triplet scalar field [Formula: see text]. This model, dubbed [Formula: see text], has a rich Higgs spectrum consisting of three CP-even Higgs [Formula: see text], one CP-odd [Formula: see text] and two pairs of charged Higgs [Formula: see text]. First, we determine the perturbative unitarity constraints and a set of nontrivial conditions for the boundedness from below (BFB). Then we derive the Veltman conditions by considering the quadratic divergencies of Higgs boson self-energies in [Formula: see text]. We find that the parameter space is severely delimited by these theoretical constraints, as well as experimental exclusion limits and Higgs signal rate measurements at LEP and LHC. Using HiggsBounds-5.3.2beta and HiggSignals-2.2.3beta public codes, an exclusion test at [Formula: see text] is then performed on the physical scalars of [Formula: see text]. Our analysis provides a clear insight on the nonstandard scalar masses, showing that the allowed ranges are strongly sensitive to the sign of mixing angle [Formula: see text], essentially when naturalness is involved. For [Formula: see text] scenario, our results place higher limits on the bounds of all scalar masses, and show that the pairs [Formula: see text] and [Formula: see text] are nearly mass degenerate varying within the intervals [Formula: see text] GeV and [Formula: see text] GeV, respectively. When [Formula: see text] turns positive, we show that consistency with theoretical constraints and current LHC data, essentially on the diphoton decay channel, favors Higgs masses varying within wide allowed ranges: [Formula: see text] GeV for [Formula: see text]; [Formula: see text] GeV for ([Formula: see text], [Formula: see text]) and [Formula: see text] GeV for ([Formula: see text], [Formula: see text]). Finally, we find that the [Formula: see text] and [Formula: see text] Higgs decay modes are generally correlated if [Formula: see text] lies within the reduced intervals [Formula: see text] and [Formula: see text] parameter is frozen around [Formula: see text] ([Formula: see text]) for [Formula: see text] ([Formula: see text]).

scholarly journals SIGNATURES OF NEW PHYSICS IN DILEPTONIC B-DECAYS

2006 ◽  
Vol 21 (12) ◽  
pp. 2617-2634 ◽  
Author(s):  
S. RAI CHOUDHURY ◽  
A. S. CORNELL ◽  
NAVEEN GAUR ◽  
G. C. JOSHI
Keyword(s):  
B Mesons ◽  
B Meson ◽  
Higgs Doublet ◽  
New Physics ◽  
Final State ◽  
Decay Modes ◽  
Leptonic Decays ◽  
The Standard Model ◽  
Doublet Model ◽  
Two Higgs Doublet Model

Leptonic decays of B-mesons are theoretically very clean probes for testing the Standard Model (SM) and possible physics beyond it. Amongst the various leptonic decays of the B-meson, the pure dileptonic decay B → ℓ+ ℓ- is very important, as this mode is helicity suppressed in the SM but can be substantially enhanced in some of the models beyond the SM, such as supersymmetric (SUSY) theories and the two Higgs doublet model (2HDM). Although the purely dileptonic decay mode is helicity suppressed in the SM its associated mode B → ℓ+ ℓ-γ does not have the same suppression, due to the presence of γ in the final state. In this paper we will also analyze the effects of enhanced Z-penguins on these two decay modes.

MODELS OF CP VIOLATION EXCLUSIVELY VIA NEUTRAL-SCALAR EXCHANGE

1994 ◽  
Vol 09 (11) ◽  
pp. 1873-1888 ◽  
Author(s):  
L. LAVOURA
Keyword(s):  
Cp Violation ◽  
W Bosons ◽  
Higgs Doublet ◽  
Higgs Bosons ◽  
Neutral Scalar ◽  
Charged Higgs ◽  
Doublet Model ◽  
Charged Higgs Bosons ◽  
Two Higgs Doublet Model

I suggest a two-Higgs-doublet model in which CP violation is mediated only by the neutral Higgs bosons, via the mechanism of scalar-pseudoscalar mixing. In this model there is no CP violation in the exchange of either W bosons or charged Higgs bosons. The model has only two basic CP-violating quantities. I remark that other models of this kind, but with more than two Higgs doublets, may also be built.

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