THE Z BOSON, THE TOP QUARK, AND NON-MINIMAL HIGGS BOSONS

1990 ◽  
Vol 05 (24) ◽  
pp. 1909-1917 ◽  
Author(s):  
W. HOLLIK
Keyword(s):  
Top Quark ◽  
Z Boson ◽  
Vector Boson ◽  
Higgs Bosons ◽  
Precision Measurements ◽  
Negative Contribution ◽  
Mixing Angle ◽  
The Standard Model ◽  
Charged Higgs ◽  
Charged Higgs Bosons

The impacts of a heavy top quark on the relation between the vector boson masses and the mixing angle at the Z peak, the on-resonance asymmetries, and the Z decay widths are reviewed in the minimal model and extensions within SU (2) × U (1). Of particular interest are models with two scalar doublets where the charged Higgs bosons can give a sizeable negative contribution to the partial width [Formula: see text] This enhancement of the Standard Model top effect can be used to separate models with charged Higgs bosons coupling to the (t, b) doublet from other classes of models affecting only the ρ-parameter. Precision measurements of the Z partial widths will provide significant constraints on the two doublet models if the top quark is very heavy.

SEARCH FOR CHARGED HIGGS BOSONS IN DECAYS OF PAIR-PRODUCED TOP QUARKS AT DØ

2001 ◽  
Vol 16 (supp01a) ◽  
pp. 395-398
Author(s):  
◽  
PHILLIP GUTIERREZ
Keyword(s):  
Standard Model ◽  
Top Quark ◽  
Top Quarks ◽  
Higgs Bosons ◽  
Full Data ◽  
The Standard Model ◽  
Charged Higgs ◽  
Charged Higgs Bosons

We present a search for t → bH+ in [Formula: see text] candidate events at DØ based on two methods. The first seeks a deficit in signal relative to expectations from the standard model (SM). Such a deficit would imply the presence of a non-SM decay of the top quark. This search involves the full data sample of ≈ 110 pb -1 of [Formula: see text] collisions at [Formula: see text], collected with the DØ detector. The second method looks for charged Higgs decays to τ leptons (and associated neutrinos), and is based on a 62 pb -1 subset of the aforementioned data sample.

scholarly journals Top quark polarization as a probe of charged Higgs bosons

2018 ◽  
Vol 98 (11) ◽  
Author(s):  
Abdesslam Arhrib ◽  
Adil Jueid ◽  
Stefano Moretti
Keyword(s):  
Top Quark ◽  
Higgs Bosons ◽  
Charged Higgs ◽  
Charged Higgs Bosons

scholarly journals Searching for heavy charged Higgs bosons through top quark polarization

2020 ◽  
Vol 35 (15n16) ◽  
pp. 2041011 ◽  
Author(s):  
Abdesslam Arhrib ◽  
Adil Jueid ◽  
Stefano Moretti
Keyword(s):  
Higgs Boson ◽  
Top Quark ◽  
Hadron Collider ◽  
Underlying Mechanism ◽  
Charged Higgs Boson ◽  
Higgs Bosons ◽  
Type I ◽  
Chiral Structure ◽  
Charged Higgs ◽  
Charged Higgs Bosons

We study the production of a heavy charged Higgs boson at the Large Hadron Collider (LHC) in [Formula: see text] within a 2-Higgs Doublet Model (2HDM). The chiral structure of the [Formula: see text] coupling can trigger a particular spin state of the top quark produced in the decay of a charged Higgs boson and, therefore, is sensitive to the underlying mechanism of the Electroweak Symmetry Breaking (EWSB). Taking two benchmark models (2HDM type-I and 2HDM type-Y) as an example, we show that inclusive rates, differential distributions and forward–backward asymmetries of the top quark’s decay products can be used to search for heavy charged Higgs bosons and also as model discriminators.

SEARCH FOR CHARGED HIGGS BOSONS AT SSC

1987 ◽  
Vol 02 (04) ◽  
pp. 1055-1067 ◽  
Author(s):  
Hans-Uno Bengtsson ◽  
Hiroaki Yamamoto ◽  
Sachio Komamiya
Keyword(s):  
Decay Mode ◽  
Top Quark ◽  
Vacuum Expectation ◽  
Higgs Doublet ◽  
Higgs Bosons ◽  
Quark Interaction ◽  
Charged Higgs ◽  
Charged Higgs Bosons ◽  
Two Higgs Doublet Models ◽  
Very High

We examine the possibility of finding charged Higgs bosons (H±) at the SSC. The charged Higgs boson is produced with a top quark via a gluon+bottom quark interaction (g+b→H+t). For the two Higgs doublet models, H± decays predominantly into t+b. Since the background from QCD processes will be very severe for this decay mode, we studied the H±→τ+ν decay mode. Even for this mode, background from the processes pp→W+t+spectators→ℓ+νℓ+t+spectators will be very high. In the two Higgs doublet models, it is very difficult to extract the charged Higgs signal for reasonable values of the ratio of the two vacuum expectation values ( tan β=v1/v2).

scholarly journals Search for charged Higgs bosons produced in vector boson fusion processes and decaying into vector boson pairs in proton–proton collisions at $$\sqrt{s} = 13\,{\text {TeV}} $$

2021 ◽  
Vol 81 (8) ◽  
Author(s):  
A. M. Sirunyan ◽  
A. Tumasyan ◽  
W. Adam ◽  
J. W. Andrejkovic ◽  
T. Bergauer ◽  
...  
Keyword(s):  
Branching Fraction ◽  
Vector Boson ◽  
Higgs Bosons ◽  
Vector Boson Fusion ◽  
Proton Proton ◽  
Proton Collisions ◽  
Charged Higgs ◽  
Vector Bosons ◽  
Charged Higgs Bosons ◽  
Proton Proton Collisions

AbstractA search for charged Higgs bosons produced in vector boson fusion processes and decaying into vector bosons, using proton–proton collisions at $$\sqrt{s}=13\,{\text {TeV}} $$ s = 13 TeV at the LHC, is reported. The data sample corresponds to an integrated luminosity of 137$$\,{\text {fb}}^{-1}$$ fb - 1 collected with the CMS detector. Events are selected by requiring two or three electrons or muons, moderate missing transverse momentum, and two jets with a large rapidity separation and a large dijet mass. No excess of events with respect to the standard model background predictions is observed. Model independent upper limits at 95% confidence level are reported on the product of the cross section and branching fraction for vector boson fusion production of charged Higgs bosons as a function of mass, from 200 to 3000$$\,{\text {GeV}}$$ GeV . The results are interpreted in the context of the Georgi–Machacek model.

scholarly journals One-loop corrections to the two-body decays of the charged Higgs bosons in the real and complex NMSSM

2021 ◽  
Vol 81 (4) ◽  
Author(s):  
Thi Nhung Dao ◽  
Margarete Mühlleitner ◽  
Shruti Patel ◽  
Kodai Sakurai
Keyword(s):  
Cp Violation ◽  
Higgs Bosons ◽  
Supersymmetric Extension ◽  
Wide Range ◽  
The Standard Model ◽  
Charged Higgs ◽  
Charged Higgs Bosons ◽  
The One ◽  
Higher Order Corrections ◽  
The Impact

AbstractWe evaluate the full next-to-leading order supersymmetric (SUSY) electroweak and SUSY-QCD corrections to the on-shell two-body decays of the charged Higgs bosons in the framework of the next-to-minimal supersymmetric extension of the Standard Model (NMSSM) allowing also for CP violation. We furthermore provide the possibility to choose between different renormalization schemes in the electroweakino and the squark and slepton sectors. Our corrections are implemented in the code and thus complete the one-loop corrections of the charged Higgs boson decays which so far only included the state-of-the-art QCD corrections and the resummed SUSY-electroweak and SUSY-QCD corrections. We investigate the impact of the NLO corrections including the newly computed higher-order corrections for each decay mode in a wide range of the parameter space that is allowed by the theoretical and experimental constraints as well as the effect of CP violation and the dependence on the choice of the renormalization scheme. The new version of is made publicly available.

scholarly journals Combination oftt¯cross section measurements and constraints on the mass of the top quark and its decays into charged Higgs bosons

2009 ◽  
Vol 80 (7) ◽  
Author(s):  
V. M. Abazov ◽  
B. Abbott ◽  
M. Abolins ◽  
B. S. Acharya ◽  
M. Adams ◽  
...  
Keyword(s):  
Cross Section ◽  
Top Quark ◽  
Higgs Bosons ◽  
Charged Higgs ◽  
Charged Higgs Bosons
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