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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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TL;DR: In this paper, the cosmological relic density of the lightest supersymmetric particle under the assumption of gauge and Yukawa coupling unification is calculated under the universal boundary conditions from gravity-mediated supersymmetry breaking.
Abstract: The cosmological relic density of the lightest supersymmetric particle of the minimal supersymmetric standard model is calculated under the assumption of gauge and Yukawa coupling unification. We employ radiative electroweak breaking with universal boundary conditions from gravity-mediated supersymmetry breaking. Coannihilation of the lightest supersymmetric particle, which turns out to be an almost pure bino, with the next-to-lightest supersymmetric particle (the lightest stau) is crucial for reducing its relic density to an acceptable level. Agreement with the mixed or the pure cold (in the presence of a nonzero cosmological constant) dark matter scenarios for large scale structure formation in the universe requires that the lightest stau mass is about 2-8% larger than the bino mass, which can be as low as 222 GeV. The smallest allowed value of the lightest stau mass turns out to be about 232 GeV.

225 citations

Journal ArticleDOI
TL;DR: In this article, a complete study of ΔS = 2 and ΔB = 2 processes in a warped extra dimensional model with a custodial protection of ZbLL was presented, including eK, ΔMK, ΔMs, ΔMd, ASLq, ΔΓq, ACP(Bd→ψKS) and ACP (Bs→ ψ).
Abstract: We present a complete study of ΔS = 2 and ΔB = 2 processes in a warped extra dimensional model with a custodial protection of ZbLL, including eK, ΔMK, ΔMs, ΔMd, ASLq, ΔΓq, ACP(Bd→ψKS) and ACP(Bs→ψ). These processes are affected by tree level contributions from Kaluza-Klein gluons, the heavy KK photon, new heavy electroweak gauge bosons ZH and Z', and in principle by tree level Z contributions. We confirm recent findings that the fully anarchic approach where all the hierarchies in quark masses and weak mixing angles are geometrically explained seems implausible and we confirm that the KK mass scale MKK generically has to be at least ~ 20 TeV to satisfy the eK constraint. We point out, however, that there exist regions in parameter space with only modest fine-tuning in the 5D Yukawa couplings which satisfy all existing ΔF = 2 and electroweak precision constraints for scales MKK 3 TeV in reach of the LHC. Simultaneously we find that ACP(Bs → ψ) and AsSL can be much larger than in the SM as indicated by recent results from CDF and DO data. We point out that for Bd,s physics ΔF = 2 observables the complex (ZH,Z') can compete with KK gluons, while the tree level Z and KK photon contributions are very small. In particular we point out that the ZdiLjL couplings are protected by the custodial symmetry. As a by-product we show the relation of the RS flavour model to the Froggatt-Nielsen mechanism and we provide analytic formulae for the effective flavour mixing matrices in terms of the fundamental 5D parameters.

223 citations

Journal ArticleDOI
TL;DR: The phenomenology of a Higgs sector for the standard model which contains both doublet and triplet fields (under SU(2){sub {ital L}})}, which has many exotic features and surprising experimental signatures is explored.
Abstract: Even though the standard model of the strong and electroweak interactions has proven enormously successful, it need not be the case that a single Higgs-doublet field is responsible for giving masses to the weakly interacting vector bosons and the fermions In this paper we explore the phenomenology of a Higgs sector for the standard model which contains both doublet and triplet fields (under SU(2){sub {ital L}}) The resulting Higgs bosons have many exotic features and surprising experimental signatures Since a critical task of future accelerators will be to either discover or establish the nonexistence of Higgs bosons with mass below the TeV scale, it will be important to keep in mind the alternative possibilities characteristic of this and other nonminimal Higgs sectors

223 citations

Journal ArticleDOI
TL;DR: In this article, the boundary conditions at the ends of an extra dimensional interval were found consistent with the variational principle and explained which ones arise in various physical circumstances, and they were applied to Higgsless models of electroweak symmetry breaking, where the symmetry is not broken by a scalar vacuum expectation value, but rather by the boundary condition of the gauge fields.
Abstract: We consider fermions on an extra dimensional interval. We find the boundary conditions at the ends of the interval that are consistent with the variational principle, and explain which ones arise in various physical circumstances. We apply these results to Higgsless models of electroweak symmetry breaking, where electroweak symmetry is not broken by a scalar vacuum expectation value, but rather by the boundary conditions of the gauge fields. We show that it is possible to find a set of boundary conditions for bulk fermions that would give a realistic fermion mass spectrum without the presence of a Higgs scalar, and present some sample fermion mass spectra for the standard model quarks and leptons as well as their resonances.

223 citations

Journal ArticleDOI
TL;DR: In this article, the authors examined the extent to which the new Higgs particle's couplings resemble those of the single Higgs boson of the Standard Model and showed that these couplings are highly consistent with a dependence on particle masses that is linear to within a few %.
Abstract: There are many indirect and direct experimental indications that the new particle H discovered by the ATLAS and CMS Collaborations has spin zero and (mostly) positive parity, and that its couplings to other particles are correlated with their masses. To a high degree of confidence, it is a Higgs boson, and here we examine the extent to which its couplings resemble those of the single Higgs boson of the Standard Model. Our global analysis of its couplings to fermions and massive bosons determines that they have the same relative sign as in the Standard Model. We also show directly that these couplings are highly consistent with a dependence on particle masses that is linear to within a few %, and scaled by the conventional electroweak symmetry-breaking scale to within 10%. We also give constraints on loop-induced couplings, on the total Higgs decay width, and on possible invisible decays of the Higgs boson under various assumptions.

222 citations


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