Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 13 of 13 for “"Electroweak symmetry breaking"”.
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Aspects of electroweak symmetry breaking in physics beyond the standard model
… expectation that the minimal model for electroweak symmetry breaking, with a single Higgs boson, is not realised in nature and that new physics, in addition to (or instead of) the Higgs, will be discovered at the Large Hadron Collider (LHC). However constraints on new physics indicate …
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Electroweak symmetry breaking in the era of the Higgs boson discovery
… thesis we study possible deviations from the electroweak symmetry breaking mechanism as predicted by the Standard Model (SM), and we introduce a new framework to analyze hadronic final states at colliders. In the first part, we begin by considering supersymmetric extensions of the SM and by …
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New Aspects of Gauge-Boson Couplings and the Higgs Sector
… stability of their potential and to spontaneous electroweak symmetry breaking. Further, two approaches to the model-independent parameterisation of new-physics effects in the gauge-boson sector are studied. In a form-factor approach to three-gauge-boson couplings at linear colliders in the …
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Scale of Fermion Mass Generation
… implies an upper bound on the scale of electroweak symmetry breaking, Lambda EWSB ≡ 8pv ≈ 1 TeV. Appelquist and Chanowitz have derived an analogous upper bound on the scale of fermion mass generation, proportional to v 2/mf, by considering the scattering of same-helicity …
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Search for the Higgs Boson in the ZZ --> ℓℓvv channel with CMS
… remains to be addressed is the mechanism for electroweak symmetry breaking (EWSB). Without EWSB in the theory, the massive weak force mediators - the W and Z bosons, are required to be massless to satisfy gauge symmetry. To incorporate EWSB into the SM, the Higgs mechanism is invoked and …
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Beyond Standard Model Physics under the ground and in the sky
… the nature of Higgs and its connections to electroweak symmetry breaking, we have performed a model independent study of spin-1 contributions in gauge extensions of Standard model. The null results of all low energy supersymmetric searches has lead to the development of Split SUSY models …
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Suppression of the fake lepton background in same-sign W-boson scattering with the ATLAS experiment
… process that is useful for probing the nature of electroweak symmetry breaking and the Higgs mechanism. Analysis is currently underway to measure the cross-section to a significance of 5σ or higher using √s = 13 TeV data from the ATLAS detector's Run 2. The two scattered W-bosons decay …
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Measurement of W Boson Polarization in Top Quark Decay
… W boson is intimately related to the electroweak symmetry breaking mechanism, and the standard model gives a specific prediction for the fraction longitudinal W bosons from top decays, it is of particular interest for study. This thesis presents a measurement of W boson polarization in …
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Electroweak physics and evidence for a Higgs boson decaying to a pair of tau leptons with the CMS detector
.Studies of the electroweak interactions using final states with leptons in proton-proton collisions at the Large Hadron Collider at [square root of] s = 7 TeV, [square root of] s = 8 TeV, and [square root of] s = 13 TeV center-of-mass energies are described. Measurements of total inclusive and …
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Observation of the electroweak production of two same-sign W bosons in proton-proton collisions with the ATLAS detector
… within the Standard Model (SM). It results from electroweak mediated processes such as Vector Boson Scattering (VBS), a process linked with electroweak symmetry breaking. Therefore, an observation of the W±W± VBS process does not only confirm the predictions of the SM at such a small …
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Phenomenological aspects of new physics at high energy hadron colliders
… and a model moti- vated by strong dynamics electroweak symmetry breaking that contains new resonances, leptoquarks, that couple primarily to quarks and leptons of the third generation. In the prior model, we improve the current treatment of the W′ by considering interference ef- fects with …
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Precision Physics with W-bosons at the Large Hadron Collider
… Standard Model. Being central to what is called Electroweak Symmetry Breaking mechanism, they obtain mass by interacting with the Higgs field. Their longitudinal polarisation is induced by the Goldstone modes of the Higgs field and provides a direct handle on any massive new physics models. In …
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Higgs production via weak boson fusion in the Standard Model and the MSSM
… of the Higgs boson and the mechanism of electroweak symmetry breaking. In this thesis this process is studied in detail for both the LHC and a future linear collider. Results for light Higgs production via vector boson fusion at a linear collider, taking the Higgsstrahlung contribution …