scholarly journals DECAY WIDTH MODELING OF HIGGS BOSON WITHIN THDM MODEL

2021 ◽  
pp. 11-13
Author(s):  
T.V. Obikhod ◽  
E.A. Petrenko
Keyword(s):  
Higgs Boson ◽  
Decay Width ◽  
Cross Section ◽  
Production Cross Section ◽  
Production Cross ◽  
New Physics ◽  
Higgs Bosons ◽  
Beyond The Standard Model ◽  
The Standard Model

As part of the search for new physics beyond the Standard Model, we chose the determination of the Higgs boson decay width as one of the least experimentally determined values. The decay widths into the four fermions of the lightest and heaviest CP-even Higgs bosons of the THDM model were calculated, taking into account QCD and electroweak corrections in the NLO approximation. To achieve this goal, the program Monte Carlo Prophecy 4f with special scenarios of parameters, 7B1 and 5B1 were used. It was found that the decay width of the heavier CPeven Higgs boson H differs from HSM by 1227.93 times and changes to a negative value when deviating from the standard scenarios. Scale factors kZ2 and kW2 showed the predominance of the associated with Z boson production cross section of CP-even Higgs boson over the associated with W production cross section.

scholarly journals HIGGS SEARCHES AT THE TEVATRON

2010 ◽  
Vol 25 (27n28) ◽  
pp. 5097-5104
Author(s):  
◽  
KAZUHIRO YAMAMOTO
Keyword(s):  
Higgs Boson ◽  
Standard Model ◽  
Cross Section ◽  
Mass Range ◽  
Higgs Bosons ◽  
Beyond The Standard Model ◽  
Standard Model Higgs Boson ◽  
Significant Excess ◽  
Proton Antiproton ◽  
The Standard Model

We present the latest results on searches for the standard and beyond-the-standard model Higgs bosons in proton-antiproton collisions at [Formula: see text] by the CDF and DØ experiments at the Fermilab Tevatron. No significant excess is observed above the expected background, and the cross section limits for the Higgs bosons are calculated. It is noticed that the standard model Higgs boson in the mass range 163 – 166 GeV/c2 is excluded at the 95% C.L.

scholarly journals S-boson production in the reaction of Coulomb scattering of a nucleus by a proton or electron

2019 ◽  
pp. 88-89
Author(s):  
O. Barabash ◽  
V. S. Kovtoniuk
Keyword(s):  
Cross Section ◽  
Production Cross Section ◽  
Production Cross ◽  
Fusion Reaction ◽  
Boson Production ◽  
Beyond The Standard Model ◽  
Scalar Boson ◽  
The Standard Model ◽  
Nucleus Scattering ◽  
Ds Meson

The production cross-section of the beyond the standard model (BSM) scalar boson (S boson) have been considered it the article. Scalar boson produced via photon fusion reaction in the deep inelastic scattering of a charged particle (proton or electron) on heavy nucleus of the target. This process is one of the possible mechanisms of BSM boson production at the SHiP (Search for Hidden Particles) experiment at the CERN LHC and may be dominating among others processes due to large nuclear charge. Previously [1], the amplitude and the production cross-section of this reaction were found. The found cross-section was analyzed for the case of proton scattering on the lead nucleus and compared with the production cross-section in the decay of Ds meson. In this paper we make estimate of the process more accurate and consider also electron-nucleus scattering. It was found that the photon fusion reaction pZ \to S may be effective only in the case of massless S boson.

scholarly journals Search for Heavy Higgs Bosons with the ATLAS Detector

2018 ◽  
Vol 46 ◽  
pp. 1860056
Author(s):  
Jana Schaarschmidt
Keyword(s):  
Large Hadron Collider ◽  
Cross Section ◽  
Production Cross Section ◽  
Production Cross ◽  
Hadron Collider ◽  
New Physics ◽  
Atlas Detector ◽  
Higgs Bosons ◽  
Final States ◽  
Atlas Experiment

The ATLAS experiment at the Large Hadron Collider performed searches for heavy Higgs bosons, whose presence would establish the existance of new physics. Searches for charged and neutral Higgs bosons are carried out using 8 or 13 TeV data for various production modes and in many different final states. No deviations from Standard Model expectations are observed. Exclusions limits are set on the production cross section and on parameters in various benchmark models.

scholarly journals Comparing production cross-sections for QCD matter, Higgs boson, neutrino with dark energy in accelerating universe

2017 ◽  
Vol 14 (10) ◽  
pp. 1750139 ◽  
Author(s):  
Tooraj Ghaffary
Keyword(s):  
Dark Energy ◽  
Higgs Boson ◽  
Event Horizon ◽  
Cross Section ◽  
Cross Sections ◽  
Production Cross Section ◽  
Production Cross ◽  
Higgs Bosons ◽  
Accelerating Universe ◽  
The Universe

In this research, the production cross-sections for quantum chromodynamics (QCD) matter, neutrino and dark energy due to acceleration of Universe are calculated. To obtain these cross-sections, the Universe production cross-section is multiplied by the particle or dark energy distribution in accelerating Universe. Also, missing cross-section for each matter and dark energy due to formation of event horizon is calculated. It is clear that the cross-section of particles produced near event horizon of Universe is much larger for higher acceleration of Universe. This is because as the acceleration of Universe becomes larger, the Unruh temperature becomes larger and the thermal radiations of particles are enhanced. There are different channels for producing Higgs boson in accelerating Universe. Universe may decay to quark and gluons, and then these particles interact with each other and Higgs boson is produced. Also, some Higgs bosons are emitted directly from event horizon of Universe. Comparing Higgs boson cross-sections via different channels, it is observed that at lower acceleration, [Formula: see text], the Universe will not be able to emit Higgs, but is still able to produce a quark and eventually for [Formula: see text] the Universe can only emit massless gluons. As the acceleration of Universe at the large hadron collider (LHC) increases, [Formula: see text], most of Higgs bosons production will be due to Unruh effect near event horizon of Universe. Finally comparing the production cross-section for dark energy with particle cross-sections, it is found that the cross-section for dark energy is dominated by QCD matter, Higgs boson and neutrino. This result is consistent with previous predictions for dark energy cross-section.

Prospects for Observing $t\bar tH$ at Run II: A discovery mode for the Higgs boson?

2001 ◽  
Vol 16 (supp01a) ◽  
pp. 308-310 ◽  
Author(s):  
J. Goldstein ◽  
C. S. Hill ◽  
J. Incandela ◽  
Stephen Parke ◽  
D. Rainwater ◽  
...  
Keyword(s):  
Higgs Boson ◽  
Cross Section ◽  
Top Quark ◽  
Production Cross Section ◽  
Production Cross ◽  
Branching Ratio ◽  
Higgs Bosons ◽  
Standard Model Higgs Boson ◽  
High Luminosity ◽  
Associated Production

The production of a Standard Model Higgs boson in association with a top quark pair at the upcoming high luminosity run (15 fb -1 integreted luminosity) of the Fermilab Tevatron [Formula: see text] is revisited. For Higgs masses below 140 GeV we demonstrate that the production cross section times branching ratio for [Formula: see text] decays yields a significant number of events and that this mode is competitive with and complementary to the searches using [Formula: see text], ZH associated production. For higher mass Higgs bosons the H → W+ W- decays are more difficult but have the potential to provide a few spectacular events.

scholarly journals A special Higgs challenge: measuring the mass and production cross section with ultimate precision at FCC-ee

2021 ◽  
Vol 137 (1) ◽  
Author(s):  
Paolo Azzurri ◽  
Gregorio Bernardi ◽  
Sylvie Braibant ◽  
David d’Enterria ◽  
Jan Eysermans ◽  
...  
Keyword(s):  
Higgs Boson ◽  
Cross Section ◽  
Production Cross Section ◽  
Production Cross ◽  
Boson Mass ◽  
Higgs Boson Mass ◽  
Centre Of Mass ◽  
Reconstruction Performance ◽  
Statistical Limit

AbstractThe FCC-ee offers powerful opportunities to determine the Higgs boson parameters, exploiting over $$10^6$$ 10 6 $${ \hbox {e}^+\hbox {e}^- \rightarrow \hbox {ZH}}$$ e + e - → ZH events and almost $$10^5$$ 10 5 $${ \hbox {WW} \rightarrow \hbox {H}}$$ WW → H events at centre-of-mass energies around 240 and 365 GeV. This essay spotlights the important measurements of the ZH production cross section and of the Higgs boson mass. The measurement of the total ZH cross section is an essential input to the absolute determination of the HZZ coupling—a “standard candle” that can be used by all other measurements, including those made at hadron colliders—at the per-mil level. A combination of the measured cross sections at the two different centre-of-mass energies further provides the first evidence for the trilinear Higgs self-coupling, and possibly its first observation if the cross section measurement can be made accurate enough. The determination of the Higgs boson mass with a precision significantly better than the Higgs boson width (4.1 MeV in the standard model) is a prerequisite to either constrain or measure the electron Yukawa coupling via direct $${ \hbox {e}^+\hbox {e}^- \rightarrow \hbox {H}}$$ e + e - → H production at $$\sqrt{s} = 125$$ s = 125  GeV. Approaching the statistical limit of 0.1% and $${\mathcal {O}}(1)$$ O ( 1 )  MeV on the ZH cross section and the Higgs boson mass, respectively, sets highly demanding requirements on accelerator operation (ZH threshold scan, centre-of-mass energy measurement), detector design (lepton momentum resolution, hadronic final state reconstruction performance), theoretical calculations, and analysis techniques (efficiency and purity optimization with modern tools, constrained kinematic fits, control of systematic uncertainties). These challenges are examined in turn in this essay

scholarly journals Search for a heavy Higgs boson decaying into two lighter Higgs bosons in the ττbb final state at 13 TeV

2021 ◽  
Vol 2021 (11) ◽  
Author(s):  
◽  
A. Tumasyan ◽  
W. Adam ◽  
J. W. Andrejkovic ◽  
T. Bergauer ◽  
...  
Keyword(s):  
Higgs Boson ◽  
Cross Section ◽  
Production Cross Section ◽  
Production Cross ◽  
Branching Fractions ◽  
Center Of Mass ◽  
Final State ◽  
Signal Process ◽  
Center Of Mass Energy ◽  
Heavy Higgs Boson

Abstract A search for a heavy Higgs boson H decaying into the observed Higgs boson h with a mass of 125 GeV and another Higgs boson hS is presented. The h and hS bosons are required to decay into a pair of tau leptons and a pair of b quarks, respectively. The search uses a sample of proton-proton collisions collected with the CMS detector at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 137 fb−1. Mass ranges of 240–3000 GeV for mH and 60–2800 GeV for $$ {m}_{{\mathrm{h}}_{\mathrm{S}}} $$ m h S are explored in the search. No signal has been observed. Model independent 95% confidence level upper limits on the product of the production cross section and the branching fractions of the signal process are set with a sensitivity ranging from 125 fb (for mH = 240 GeV) to 2.7 fb (for mH = 1000 GeV). These limits are compared to maximally allowed products of the production cross section and the branching fractions of the signal process in the next-to-minimal supersymmetric extension of the standard model.

On the model dependence of fiducial cross-section measurements

2019 ◽  
Vol 34 (38) ◽  
pp. 2050065
Author(s):  
Gabriel Facini ◽  
Kyrylo Merkotan ◽  
Matthias Schott ◽  
Alexander Sydorenko
Keyword(s):  
Standard Model ◽  
Cross Section ◽  
Production Cross ◽  
Hadron Collider ◽  
New Physics ◽  
Effective Field ◽  
Model Bias ◽  
Systematic Uncertainties ◽  
Standard Model Cross Section ◽  
The Standard Model

Fiducial production cross-section measurements of Standard Model processes, in principle, provide constraints on new physics scenarios via a comparison of the predicted Standard Model cross-section and the observed cross-section. This approach received significant attention in recent years, both from direct constraints on specific models and the interpretation of measurements in the view of effective field theories. A generic problem in the reinterpretation of Standard Model measurements is the corrections application of to data to account for detector effects. These corrections inherently assume the Standard Model to be valid, thus implying a model bias of the final result. In this work, we study the size of this bias by studying several new physics models and fiducial phase–space regions. The studies are based on fast detector simulations of a generic multi-purpose detector at the Large Hadron Collider. We conclude that the model bias in the associated reinterpretations is negligible only in specific cases, however, typically on the same level as systematic uncertainties of the available measurements.

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