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 article, the role of electroweak penguin operators in non-leptonic Bd decays is analyzed both within a general framework and more specifically in view of the theoretical cleanliness of methods to determine CKM phases.
Abstract: The phenomenon of CP violation in the B system and strategies for extracting CKM phases are reviewed. We focus both on general aspects and on some recent developments including CP-violating asymmetries in Bd decays, the Bs system in light of a possible width difference ΔΓs, charged B decays, and SU(3) relations among certain transition amplitudes. In order to describe the relevant nonleptonic B decays, low energy effective Hamiltonians calculated beyond the leading logarithmic approximation are used. Special emphasis is given to the role of electroweak penguin operators in such transitions. These effects are analyzed both within a general framework and more specifically in view of the theoretical cleanliness of methods to determine CKM phases. Strategies for obtaining insights into the world of electroweak penguins are discussed.
115 citations
TL;DR: In this article, a scenario that the universe undergoes a two-step phase transition with the first step happened to the dark matter sector and the second step being the transition between the dark mass and the electroweak vacuums, where the barrier between the two vacuacs, that is necessary for a strongly first-order electroweak phase transition (EWPT) as required by the baryogenesis mechanism, arises at the tree-level.
Abstract: We study in this work a scenario that the universe undergoes a two step phase transition with the first step happened to the dark matter sector and the second step being the transition between the dark matter and the electroweak vacuums, where the barrier between the two vacuums, that is necessary for a strongly first order electroweak phase transition (EWPT) as required by the electroweak baryogenesis mechanism, arises at the tree-level. We illustrate this idea by working with the standard model (SM) augmented by a scalar singlet dark matter and an extra scalar singlet which mixes with the SM Higgs boson. We study the conditions for such pattern of phase transition to occur and especially for the strongly first order EWPT to take place, as well as its compatibility with the basic requirements of a successful dark matter, such as observed relic density and constraints of direct detections. We further explore the discovery possibility of this pattern EWPT by searching for the gravitational waves generated during this process in spaced based interferometer, by showing a representative benchmark point of the parameter space that the generated gravitational waves fall within the sensitivity of eLISA, DECIGO and BBO.
115 citations
TL;DR: In this paper, the authors present results for the two-loop self-energy functions for neutral and charged Higgs scalar bosons in minimal supersymmetry, including all terms involving the QCD coupling, and those following from Feynman diagrams involving Yukawa couplings and scalar interactions that do not vanish as the electroweak gauge couplings are turned off.
Abstract: I present results for the two-loop self-energy functions for neutral and charged Higgs scalar bosons in minimal supersymmetry. The contributions given here include all terms involving the QCD coupling, and those following from Feynman diagrams involving Yukawa couplings and scalar interactions that do not vanish as the electroweak gauge couplings are turned off. The impact of these contributions on the computation of pole masses of the neutral and charged Higgs scalar bosons is studied in a few examples.
115 citations
TL;DR: In this article, the authors investigate a mono-Z process as a potential dark matter search strategy at the LHC, where a single Z boson recoils against missing transverse momentum, attributed to dark matter particles, which escape the detector.
Abstract: We investigate a mono-Z process as a potential dark matter search strategy at the LHC. In this channel a single Z boson recoils against missing transverse momentum, attributed to dark matter particles, χ, which escape the detector. This search strategy is related and complementary to monojet and monophoton searches. For illustrative purposes we consider the process qq→χ χZ in a toy dark matter model, where the Z boson is emitted from either the initial state quarks or from the internal propagator. Among the signatures of this process will be a pair of muons with high pT that reconstruct to the invariant mass the Z, and large amounts of missing transverse energy. Being a purely electroweak signal, QCD and other Standard Model backgrounds are relatively easily removed with modest selection cuts. We compare the signal to Standard Model backgrounds and demonstrate that even for conservative cuts, there exist regions of parameter space where the signal may be clearly visible above background in future LHC data, allowing either new discovery potential or the possibility of supplementing information about the dark sector beyond that available from other observable channels. © 2012 American Physical Society.
115 citations
TL;DR: In this paper, the potential of LEP2 to measure the trilinear couplings of the vector bosons, Z 0 W + W − and γW+ W − among one another, was investigated.
115 citations