An overview of recent results in Higgs boson physics obtained with the ATLAS and CMS experiments at the Large Hadron Collider located at CERN, Geneva, is presented. The focus is on measurements of the properties of the recently discovered Higgs boson with a mass of about 125 GeV. A brief selection of results in searches for Higgs bosons beyond the Standard Model is given, and prospects of futur...

Electroweak precision observables (EWPO) can give valuable information about the last unknown paramter of the Standard Model (SM), the Higgs-boson mass M H . EWPO can also restrict the parameter space of new physics models (NPM) such as the Minimal Supersymmetric Standard Model (MSSM). We review the respective constraints from the W boson mass, the effective leptonic mixing angle, the anomalous...

Final results from the combined data of the four LEP experiments ALEPH, DELPHI, L3 and OPAL on Standard Model (SM) Higgs boson searches are presented. New preliminary results of searches in extended models are reviewed. Final results from the combined data of the four LEP experiments ALEPH, DELPHI, L3 and OPAL on Standard Model (SM) Higgs boson searches are presented. New preliminary results of...

Higgs Mixing in the NMSSM and Light Higgsinos Kwang Sik Jeong a,b∗, Yutaro Shoji c†, Masahiro Yamaguchi c‡ a DESY, Notkestrasse 85, 22607 Hamburg, Germany b Center for Theoretical Physics of the Universe, IBS, Daejeon 305-811, Korea c Department of Physics, Tohoku University, Sendai 980-8578, Japan Abstract We explore the effects of Higgs mixing in the general next-to-minimal supersymmetric Sta...

We compute the dominant two-loop electroweak correction, of O(GFM t ), to the partial width of the decay of an intermediate-mass Higgs boson into a pair of photons. We use the asymptotic-expansion technique in order to extract the leading dependence on the top-quark mass plus four expansion terms that describe the dependence on the W and Higgs-boson masses. This correction reduces the Born resu...

In this contribution we consider the production of a Standard Model Higgs boson to next-to-next-to-leading order accuracy taking into account a finite top quark mass. This result improves the one based on the effective theory and is important for precise predictions of Higgs boson production both at Tevatron and LHC. c Copyright owned by the author(s) under the terms of the Creative Commons Att...

Several topics related to phenomenology of the Higgs sector in the supersymmetric standard model are reviewed. The upper bound of the lightest Higgs mass in the minimal supersymmetric standard model as well as extended version of it is discussed and it is shown that an ee linear collider with √ s ∼ 300−500 GeV can find at least one Higgs boson in these models. It is also pointed out that the he...

Theoretical implications of the possible observation of a Higgs boson with a mass of about 115 GeV at LEP are discussed. Within the Standard Model a Higgs boson in this mass range agrees well with the indirect constraints from electroweak precision data. However, it would nevertheless point towards physics beyond the Standard Model, in particular to Supersymmetric extensions. The interpretation...

The Standard Model (SM) requires a Higgs boson to explain the generation of fermion and gauge boson masses. The precise electroweak (EW) measurements at LEP suggest that the Higgs boson must be relatively light1, with mH < 219 GeV. A light Higgs is also required in order to unitarize the longitudinal WL −WL scattering amplitude2. In addition, the triviality bound indicates that the SM with a li...

Experiments with the Large Electron-Positron Collider at CERN have been started in 1989. Four large detectors have been constructed at LEP: ALEPH, DELPHI, L3, and OPAL. The simultaneous operation of all these detectors provided powerful cross checks of the obtained results that made them highly reliable. PNPI took an active part in construction and operation of the L3 detector. In the first per...