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, a diagrammatic calculation of the leading two-loop QCD corrections to the masses of the neutral CP-even Higgs bosons in the Minimal Supersymmetric Standard Model is presented.
Abstract: We present detailed results of a diagrammatic calculation of the leading two-loop QCD corrections to the masses of the neutral CP-even Higgs bosons in the Minimal Supersymmetric Standard Model (MSSM). The two-loop corrections are incorporated into the full diagrammatic one-loop result and supplemented with refinement terms that take into account leading electroweak two-loop and higher-order QCD contributions. The dependence of the results for the Higgs-boson masses on the various MSSM parameters is analyzed in detail, with a particular focus on the part of the parameter space accessible at LEP2 and the upgraded Tevatron. For the mass of the lightest Higgs boson, mh, a parameter scan has been performed, yielding an upper limit on mh which depends only on tan�. The results for the Higgs-boson masses are compared with results obtained by renormalization group methods. Good agreement is found in the case of vanishing mixing in the scalar quark sector, while sizable deviations occur if squark mixing is taken into account.
936 citations
TL;DR: In this article, a systematic investigation of all simple possibilities of having massive neutrinos in SU(2) models of electroweak interactions, without the ad hoc imposition of lepton number conservation, is presented.
Abstract: We make a systematic investigation of all simple possibilities of having massive neutrinos in SU(2)\ifmmode\times\else\texttimes\fi{}U(1) models of electroweak interactions, without the ad hoc imposition of lepton-number conservation. The minimal standard model is enlarged with triplet or singly or doubly charged singlet scalars as well as fermions in singlet and doublet representations. We find that in all cases the neutrino mass eigenstates are Majorana fields. This is so even though right-handed neutrino fields are added to the model. When mass terms of the Dirac type are also present (and if ${\ensuremath{
u}}_{R}'\mathrm{s}$ also have small masses) neutrinos will oscillate into antineutrinos (which, we argue, are most likely "sterile"). General fermion mass terms of both Dirac and Majorana types are studied and the results are included in the Appendix.
920 citations
TL;DR: The Inert Doublet Model as discussed by the authors is an extension of the Standard Model to include a second Higgs doublet that has neither a vev nor couplings to quarks and leptons.
Abstract: The quadratic divergences of the Higgs mass may be cancelled either accidentally or by the exchange of some new particles. Alternatively its impact on naturalness may be weakened by raising the Higgs mass, which requires changing the Standard Model below its natural cut-off. We show in detail how this can be achieved, while preserving perturbativity and consistency with the electroweak precision tests, by extending the Standard Model to include a second Higgs doublet that has neither a vev nor couplings to quarks and leptons. This Inert Doublet Model yields a perturbative and completely natural description of electroweak physics at all energies up to 1.5 TeV. The discrete symmetry that yields the Inert Doublet is unbroken, so that Dark Matter may be composed of neutral inert Higgs bosons, which may have escaped detection at LEP2. Predictions are given for multilepton events with missing transverse energy at the Large Hadron Collider, and for the direct detection of dark matter.
888 citations
TL;DR: SOFTSUSY as discussed by the authors is a program which accurately calculates the spectrum of superparticles in the CP-conserving minimal supersymmetric standard model (MSSM), with a full flavour mixing structure.
Abstract: SOFTSUSY is a program which accurately calculates the spectrum of superparticles in the CP-conserving Minimal Supersymmetric Standard Model (MSSM), with a full flavour mixing structure The program solves the renormalisation group equations with theoretical constraints on soft supersymmetry breaking terms provided by the user Weak-scale gauge coupling and fermion mass data (including one-loop finite MSSM corrections) are used as a boundary condition, as well as successful radiative electroweak symmetry breaking The program can also calculate a measure of fine-tuning The program structure has been designed to easily generalise to extensions of the MSSM This article serves as a self-contained guide to prospective users, and indicates the conventions and approximations used
885 citations
TL;DR: In this paper, one-loop corrections to masses and couplings in the minimal supersymmetric standard model are presented, and a set of compact approximations which hold over the unified parameter space associated with radiative electroweak symmetry breaking are presented.
884 citations