Topic
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 authors show that the baryon asymmetry of our universe can be explained, if the present large-scale magnetic fields indicated by the blazar observations have a negative helicity and existed in the early Universe before the electroweak phase transition.
Abstract: Helical hypermagnetic fields in the primordial Universe can produce the observed amount of baryon asymmetry through the chiral anomaly without any ingredients beyond the standard model of particle physics. While they generate no $B\ensuremath{-}L$ asymmetry, the generated baryon asymmetry survives the spharelon washout effect, because the generating process remains active until the electroweak phase transition. Solving the Boltzmann equation numerically and finding an attractor solution, we show that the baryon asymmetry of our Universe can be explained, if the present large-scale magnetic fields indicated by the blazar observations have a negative helicity and existed in the early Universe before the electroweak phase transition. We also derive the upper bound on the strength of the helical magnetic field, which is tighter than the cosmic microwave background constraint, to avoid the overproduction of baryon asymmetry.
110 citations
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TL;DR: In this paper, the use of four gauge invariant form factors allows a dense notation of electroweak one loop effects in muon pair production frome+e−-annihilation.
Abstract: The use of four gauge invariant form factors allows a dense notation of electroweak one loop effects in muon pair production frome+e−-annihilation. These form factors may be interpreted as finite renormalizations of the muon decay constant and of the weak mixing angle. Such a formulation is well adopted for use in Monte Carlo programs. The general formulae are applied to a realistic line shape scan of theZ boson resonance. For a precise determination of theZ boson's mass and width it is sufficient to take data in the small energy region within\(\sqrt s = M_z \pm \Gamma _z /2\). Finally, it is demonstrated that a simple model independent ansatz yields nearly equally good results.
109 citations
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TL;DR: In this paper, the authors considered the generation of gravitational waves by primordial helical inverse-cascade magnetohydrodynamic (MHD) turbulence produced by bubble collisions at the electroweak phase transition.
Abstract: We consider the generation of gravitational waves by primordial helical inverse-cascade magnetohydrodynamic (MHD) turbulence produced by bubble collisions at the electroweak phase transition. We extend the previous study 1 by considering both currently discussed models of MHD turbulence. For popular electroweak phase transition parameter values, the generated gravitational wave spectrum is only weakly dependent on the MHD turbulence model. Compared with the unmagnetized electroweak phase transition case, the spectrum of MHD-turbulence-generated gravitational waves peaks at lower frequency with larger amplitude and can be detected by the proposed Laser Interferometer Space Antenna.
109 citations
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TL;DR: In this paper, the double-pole approximation is applied to the reaction e+e− → W+W− → 4 fermions, which allows to address all the key issues of dealing with unstable particles, like gauge invariance, interactions between different stages of the reaction, and overlapping resonances.
109 citations
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TL;DR: In this article, a gauge-Higgs unification model in the Randall-Sundrum warped space with top and bottom quarks is constructed, where the bottom quark mass is generated by the combination of brane interactions and the Hosotani mechanism.
Abstract: An $SO(5)\ifmmode\times\else\texttimes\fi{}U(1)$ gauge-Higgs unification model in the Randall-Sundrum warped space with top and bottom quarks is constructed. Additional fermions on the Planck brane make exotic particles heavy by effectively changing boundary conditions of bulk fermions from those determined by orbifold conditions. Gauge couplings of a top quark multiplet trigger electroweak symmetry breaking by the Hosotani mechanism, simultaneously giving a top quark the observed mass. The bottom quark mass is generated by the combination of brane interactions and the Hosotani mechanism, where only one ratio of brane masses is relevant when the scale of brane masses is much larger than the Kaluza-Klein scale ($\ensuremath{\sim}1.5\text{ }\text{ }\mathrm{TeV}$). The Higgs mass is predicted to be 49.9 (53.5) GeV for the warp factor ${10}^{15}$ (${10}^{17}$). The Wilson line phase turns out $\frac{1}{2}\ensuremath{\pi}$ and the Higgs couplings to $W$ and $Z$ vanish so that the LEP2 bound for the Higgs mass is evaded. In the flat spacetime limit the electroweak symmetry is unbroken.
109 citations