scholarly journals Higgs production via weak boson fusion in the standard model and the MSSM

2012 ◽  
Vol 2012 (2) ◽  
Author(s):  
Terrance Figy ◽  
Sophy Palmer ◽  
Georg Weiglein
Keyword(s):  
Standard Model ◽  
Higgs Production ◽  
Weak Boson ◽  
The Standard Model

TeV Scale B – L Phenomenology at LHC

2007 ◽  
Vol 22 (31) ◽  
pp. 5889-5908 ◽  
Author(s):  
M. Abbas ◽  
W. Emam ◽  
S. Khalil ◽  
M. Shalaby
Keyword(s):  
Standard Model ◽  
Gauge Boson ◽  
Cross Sections ◽  
Branching Ratios ◽  
Higgs Production ◽  
Neutrino Masses ◽  
Natural Explanation ◽  
The Standard Model ◽  
The Cross

We present the phenomenology of the low scale U(1)B–L extension of the standard model and its implications at LHC. We show that this model provides a natural explanation for the presence of three right-handed neutrinos and can naturally account the observed neutrino masses and mixing. We study the decay and production of the extra gauge boson and the SM singlet scalar (heavy Higgs) predicted in this type of models. We find that the cross sections of the SM-like Higgs production are reduced by ~ 20% – 30%, while its decay branching ratios remain intact. The extra Higgs has relatively small cross sections and the branching ratios of Z′ → l+l− are of order ~ 20% compared to ~ 3% of the SM results.

Electroweak Interactions and W, Z Boson Properties

2020 ◽  
Author(s):  
Maarten Boonekamp ◽  
Matthias Schott
Keyword(s):  
Standard Model ◽  
Weak Interaction ◽  
Top Quark ◽  
Quantum Electrodynamics ◽  
Weak Interactions ◽  
Higgs Field ◽  
Nuclear Research ◽  
Strong Interactions ◽  
Weak Boson ◽  
The Standard Model

With the huge success of quantum electrodynamics (QED) to describe electromagnetic interactions in nature, several attempts have been made to extend the concept of gauge theories to the other known fundamental interactions. It was realized in the late 1960s that electromagnetic and weak interactions can be described by a single unified gauge theory. In addition to the photon, the single mediator of the electromagnetic interaction, this theory predicted new, heavy particles responsible for the weak interaction, namely the W and the Z bosons. A scalar field, the Higgs field, was introduced to generate their mass. The discovery of the mediators of the weak interaction in 1983, at the European Center for Nuclear Research (CERN), marked a breakthrough in fundamental physics and opened the door to more precise tests of the Standard Model. Subsequent measurements of the weak boson properties allowed the mass of the top quark and of the Higgs Boson to be predicted before their discovery. Nowadays, these measurements are used to further probe the consistency of the Standard Model, and to place constrains on theories attempting to answer still open questions in physics, such as the presence of dark matter in the universe or unification of the electroweak and strong interactions with gravity.

scholarly journals Gluon-fusion Higgs production in the Standard Model Effective Field Theory

2017 ◽  
Vol 2017 (12) ◽  
Author(s):  
Nicolas Deutschmann ◽  
Claude Duhr ◽  
Fabio Maltoni ◽  
Eleni Vryonidou
Keyword(s):  
Field Theory ◽  
Standard Model ◽  
Effective Field Theory ◽  
Gluon Fusion ◽  
Effective Field ◽  
Higgs Production ◽  
The Standard Model

THE LONGITUDINAL WEAK-BOSON CONTRIBUTION TO LEPTONIC DECAYS IN THE STANDARD MODEL

1990 ◽  
Vol 05 (31) ◽  
pp. 2633-2642 ◽  
Author(s):  
E. H. LEMKE
Keyword(s):  
Standard Model ◽  
Decay Amplitude ◽  
Leptonic Decay ◽  
Precision Measurements ◽  
Electroweak Theory ◽  
Projection Formula ◽  
Weak Boson ◽  
Sensitive Measure ◽  
Leptonic Decays ◽  
The Standard Model

The "longitudinal" projection [Formula: see text] of the W± propagator is analyzed in leptonic decays and found to provide a practical and sensitive measure of the accuracy of leptonic decay experiments. It is known that the standard π± decay amplitude can be ascribed to this projection. We find that the leptonic decay data do not make it possible to exhibit its effect clearly. Analogously, and this is the same, the data do not prove that weak bosons do not couple to conserved lepton currents. A verification of the effect becomes feasible by increased-precision measurements of the polarized or unpolarized spectra of the muons from the decay [Formula: see text]. This would represent a new test of the standard SU (2) × U (1) electroweak theory.

scholarly journals Differential cross-section measurements for the electroweak production of dijets in association with a Z boson in proton–proton collisions at ATLAS

2021 ◽  
Vol 81 (2) ◽  
Author(s):  
G. Aad ◽  
◽  
B. Abbott ◽  
D. C. Abbott ◽  
A. Abed Abud ◽  
...  
Keyword(s):  
Standard Model ◽  
Differential Cross Section ◽  
Cross Section ◽  
Cross Sections ◽  
Differential Cross ◽  
Azimuthal Angle ◽  
Proton Proton ◽  
Weak Boson ◽  
The Standard Model ◽  
Two Jets

AbstractDifferential cross-section measurements are presented for the electroweak production of two jets in association with a Z boson. These measurements are sensitive to the vector-boson fusion production mechanism and provide a fundamental test of the gauge structure of the Standard Model. The analysis is performed using proton–proton collision data collected by ATLAS at $$\sqrt{s}=13\ \hbox {TeV}$$ s = 13 TeV and with an integrated luminosity of $$139\ \hbox {fb}^{-1}$$ 139 fb - 1 . The differential cross-sections are measured in the $$Z\rightarrow \ell ^+\ell ^-$$ Z → ℓ + ℓ - decay channel ($$\ell =e,\mu $$ ℓ = e , μ ) as a function of four observables: the dijet invariant mass, the rapidity interval spanned by the two jets, the signed azimuthal angle between the two jets, and the transverse momentum of the dilepton pair. The data are corrected for the effects of detector inefficiency and resolution and are sufficiently precise to distinguish between different state-of-the-art theoretical predictions calculated using Powheg+Pythia8, Herwig7+Vbfnlo and Sherpa 2.2. The differential cross-sections are used to search for anomalous weak-boson self-interactions using a dimension-six effective field theory. The measurement of the signed azimuthal angle between the two jets is found to be particularly sensitive to the interference between the Standard Model and dimension-six scattering amplitudes and provides a direct test of charge-conjugation and parity invariance in the weak-boson self-interactions.

scholarly journals Testing anomalous $$H-W$$ couplings and Higgs self-couplings via double and triple Higgs production at $$e^+e^-$$ colliders

2021 ◽  
Vol 81 (3) ◽  
Author(s):  
M. Gonzalez-Lopez ◽  
M. J. Herrero ◽  
P. Martinez-Suarez
Keyword(s):  
Standard Model ◽  
Higgs Field ◽  
Effective Field ◽  
Higgs Production ◽  
Beyond The Standard Model ◽  
Effective Lagrangian ◽  
The Standard Model ◽  
Non Linear ◽  
First Time ◽  
Chiral Lagrangian

AbstractIn the present work we study the implications at the future $$e^+e^-$$ e + e - colliders of the modified interaction vertices WWH, WWHH, HHH and HHHH within the context of the non-linear effective field theory given by the Electroweak Chiral Lagrangian. These vertices are given by four parameters, a, b, $$\kappa _3$$ κ 3 and $$\kappa _4$$ κ 4 , respectively, that are independent and without any constraint from symmetry considerations in this non-linear effective Lagrangian context, given the fact the Higgs field is a singlet. This is in contrast to the Standard Model, where the vertices are related by $$V_{WWH}^\mathrm{SM}=v V_{WWHH}^\mathrm{SM}$$ V WWH SM = v V WWHH SM and $$V_{HHH}^\mathrm{SM}=v V_{HHHH}^\mathrm{SM}$$ V HHH SM = v V HHHH SM , with $$v=246$$ v = 246 GeV. We investigate the implications of the absence of these relations in the Electroweak Chiral Lagrangian case. We explore the sensitivity to these Higgs anomalous couplings in the two main channels at these colliders: double and triple Higgs production (plus neutrinos). Concretely, we study the access to a and b in $$e^+e^- \rightarrow HH \nu {\bar{\nu }}$$ e + e - → H H ν ν ¯ and the access to $$\kappa _3$$ κ 3 and $$\kappa _4$$ κ 4 in $$e^+e^- \rightarrow HHH \nu {\bar{\nu }}$$ e + e - → H H H ν ν ¯ . Our study of the beyond the Standard Model couplings via triple Higgs boson production at $$e^+e^-$$ e + e - colliders is novel and shows for the first time the possible accessibility to the quartic Higgs self-coupling.

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