The Higgs-mass dependence of the two-loop contributions to muon decay is analyzed at the two-loop level. Exact results are given for the Higgsdependent two-loop corrections associated with the fermions, i.e. no expansion in the top-quark and the Higgs-boson mass is made. The remaining theoretical uncertainties in the Higgs-mass dependence of ∆r are discussed. 1 Contribution to the proceedings o...

If spacetime contains large compact extra dimensions, the fundamental mass scale of nature, Λ, may be close to the weak scale, allowing gravitational physics to significantly modify electroweak symmetry breaking. Operators of the form (1/Λ2)|φ†Dμφ|2 and (1/Λ)φWμνB φ, where Wμν and B μν are the SU(2) and U(1) field strengths and φ is the Higgs field, remove the precision electroweak bound on the...

This article reports three analyses of W and Z boson properties from the DØ experiment at the Fermilab Tevatron. The W boson mass measurement using 1 f b −1 DØ data is presented. This measurement reaches a 43 MeV precision on the W boson mass, which is currently the most precise result from a single experiment. It is used to place indirect constraint on the mass of the hypothetical Higgs boson....

A combined search for the Standard Model Higgs boson with the ATLAS detector at the LHC is presented. The data sets used correspond to integrated luminosities from 4:6 fb 1 to 4:9 fb 1 of protonproton collisions collected at ffiffi s p 1⁄4 7 TeV in 2011. The Higgs boson mass ranges of 111.4 GeV to 116.6 GeV, 119.4 GeV to 122.1 GeV, and 129.2 GeV to 541 GeVare excluded at the 95% confidence leve...

Preliminary results from the four LEP experiments using data collected at 189 GeV have shown no evidence for the Standard Model Higgs boson. The preliminary 95% confidence level lower limits on the SM Higgs boson mass from ALEPH, DELPHI, OPAL, and L3 are 90.4 GeV/c, 94.1 GeV/c, 95.5 GeV/c, and 95.2 GeV/c, respectively. When LEP finishes in the year 2000, each experiment expects to collect 200 p...

A gauge model with chiral color symmetry is considered and possible effects of the color G-boson octet predicted by this symmetry are investigated in dependence on two free parameters, the mixing angle θG and G ′ mass mG′ . The allowed region in the mG′ − θG plane is found from the Tevatron data on the cross section σtt̄ and forward-backward asymmetry A pp̄ FB of the tt̄ production. The mass limit...

We study Higgs boson production via Double Pomeron Exchange allowing for the presence of Pomeron remnants. We estimate the number of events produced at the LHC collider, as a function of the Higgs boson mass and its decay channel. The model which successfully describes the high mass dijet spectrum observed at Tevatron (run I) is used to predict rates of events with tagged protons for the accept...

The production cross section for amH ≈ 115 GeV, SM Higgs boson in weak boson fusion at the LHC is sizable. However, the branching fraction for H → WW is expected to be relatively small. The signal, with its two forward jets, is sufficiently different from the main backgrounds that a signal to background ratio of better than 1:1 can nevertheless be obtained, with large enough rate to allow for a...