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Electroweak interaction

About: Electroweak interaction is a research topic. Over the lifetime, 16333 publications have been published within this topic receiving 468927 citations. The topic is also known as: electroweak force.


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Journal ArticleDOI
TL;DR: In this paper, the radiative corrections of the strong and electroweak interactions are calculated for the Higgs-boson decays H→WW/ZZ→4f with semileptonic or hadronic four-fermion final states in next-to-leading order.
Abstract: The radiative corrections of the strong and electroweak interactions are calculated for the Higgs-boson decays H→WW/ZZ→4f with semileptonic or hadronic four-fermion final states in next-to-leading order. This calculation is improved by higher-order corrections originating from heavy-Higgs-boson effects and photonic final-state radiation off charged leptons. The W- and Z-boson resonances are treated within the complex-mass scheme, i.e. without any resonance expansion or on-shell approximation. The calculation essentially follows our previous study of purely leptonic final states. The electroweak corrections are similar for all four-fermion final states; for integrated quantities they amount to some per cent and increase with growing Higgs-boson mass MH, reaching 7–8% at MH ~ 500 GeV. For distributions, the corrections are somewhat larger and, in general, distort the shapes. Among the QCD corrections, which include corrections to interference contributions of the Born diagrams, only the corrections to the squared Born diagrams turn out to be relevant. These contributions can be attributed to the gauge-boson decays, i.e. they approximately amount to αs/π for semileptonic final states and 2αs/π for hadronic final states. The discussed corrections have been implemented in the Monte Carlo event generator PROPHECY4F.

197 citations

Journal ArticleDOI
TL;DR: In this article, the electroweak breaking mechanism in the minimal supersymmetric standard model (MSSM) using the one-loop effective potential (V_1) was examined.
Abstract: We examine the electroweak breaking mechanism in the minimal supersymmetric standard model (MSSM) using the {\em complete} one-loop effective potential $V_1$. First, we study what is the region of the whole MSSM parameter space (i.e. $M_{1/2},m_o,\mu,...$) that leads to a succesful $SU(2)\times U(1)$ breaking with an acceptable top quark mass. In doing this it is observed that all the one-loop corrections to $V_1$ (even the apparently small ones) must be taken into account in order to get reliable results. We find that the allowed region of parameters is considerably enhanced with respect to former "improved" tree level results. Next, we study the fine-tuning problem associated with the high sensitivity of $M_Z$ to $h_t$ (the top Yukawa coupling). Again, we find that this fine-tuning is appreciably smaller once the one-loop effects are considered than in previous tree level calculations. Finally, we explore the ambiguities and limitations of the ordinary criterion to estimate the degree of fine-tuning. As a result of all this, the upper bounds on the MSSM parameters, and hence on the supersymmetric masses, are substantially raised, thus increasing the consistency between supersymmetry and observation.

197 citations

Journal ArticleDOI
TL;DR: In this paper, a simple and well motivated global U(2) symmetry, acting on the lightest two generations, completely solves the flavour changing problem and necessarily leads to a predictive texture for the Yukawa couplings.

196 citations

Journal ArticleDOI
John Preskill1
TL;DR: In this paper, the spectral function sum rules were used to determine the symmetry breakdown pattern of the electroweak symmetry breakdown for a large class of models, including weak mixing angles and pseudo-Goldstone bosons.

196 citations

Journal ArticleDOI
TL;DR: In this article, the fit of electroweak precision observables within the Standard Model with a 126 GeV Higgs boson was performed, comparing the results with theoretical predictions and discuss the impact of recent experimental and theoretical improvements.
Abstract: We perform the fit of electroweak precision observables within the Standard Model with a 126 GeV Higgs boson, compare the results with the theoretical predictions and discuss the impact of recent experimental and theoretical improvements. We introduce New Physics contributions in a model-independent way and fit for the S, T and U parameters, for the ϵ 1,2,3,b ones, for modified $ Zb\overline{b} $ couplings and for a modified Higgs coupling to vector bosons. We point out that composite Higgs models are very strongly constrained. Finally, we compute the bounds on dimension-six operators relevant for the electroweak fit.

196 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023368
2022916
2021548
2020527
2019574
2018660