We study Higgs boson decays in the minimal supersymmetric standard model where the tree–level CP invariance of the Higgs potential is explicitly broken by loop effects of soft CP–violating Yukawa interactions related to scalar quarks of the third generation. The scalar–pseudoscalar mixing among two neutral CP–even Higgs bosons and one CP–odd Higgs boson due to explicit CP violation modifies the...

We investigate the decoupling properties of the Higgs-sector-induced one-loop corrections in the lightest Higgs-boson self-couplings, in the framework of the Minimal Supersymmetric Standard Model (MSSM). The renormalized n-point vertex functions with external Higgs particles in the MSSM and in the SM are derived to the one-loop level and compared in the M A 0 ≫ M Z limit. The computation has be...

Abstract In the Randall-Sundrum model, the radion-Higgs mixing is weakly suppressed by the effective electroweak scale. One of its novel features would be a sizable three-point vertex of h (n) μν -h-φ. We explored the potential of the Fermilab Tevatron and the CERN LHC in probing the radion-Higgs mixing via the associated production of the radion with the Higgs boson. The observation of the rar...

Trilinear couplings of the neutral CP -even Higgs bosons in the Minimal Supersymmetric Standard Model (MSSM) can be measured through the multiple production of the lightest CP -even Higgs boson (h) at high-energy ee colliders. This includes the production of the heavier CP -even Higgs boson (H) via ee → ZH, in association with the CP -odd Higgs boson (A) in ee → AH, or via ee → νeν̄eH, with H su...

For energies relevant to future linear colliders, √ s & 500 GeV, the WW fusion channel dominates the Higgs boson production cross section e+e− → ν̄νh0. We have calculated the one-loop corrections to this process due to fermion and sfermion loops in the context of the MSSM. As a special case, the contribution of the fermion loops in the SM has also been studied. In general, the correction is nega...

A first search is reported for a standard model Higgs boson (H) that is produced through vector boson fusion and decays to a bottom-quark pair. Two data samples, corresponding to integrated luminosities of 19.8 inverse femtobarns and 18.3 inverse femtobarns of proton-proton collisions at √ s = 8 TeV were selected for this channel at the CERN LHC. The observed significance in these data samples ...

The two-loop corrections to the electroweak gauge boson quartic couplings, growing quadratically with the Higgs boson mass, are calculated in the Standard Model in the limit of large Higgs mass. The corrections to WWWW , WWZZ and ZZZZ four-vertices are found to be an order of magnitude larger than the two-loop m2H corrections to light fermion and triple gauge boson vertices. For a heavy Higgs b...

In the Little Higgs class of models [1], the Higgs Boson is a pseudoGoldstone boson of a spontaneously broken global symmetry. Gauge and Yukawa couplings break the symmetry explicitely, but every single coupling conserves enough of the symmetry to keep the Higgs massless. This way, the radiative corrections to the Higgs mass are only logarithmically divergent at one loop (and not quadratically ...

We calculate the dominant O ( G2FM 4 H ) two-loop electroweak corrections to the fermionic decay widths of a heavy Higgs boson in the Standard Model. Use of the Goldstone-boson equivalence theorem reduces the problem to one involving only the physical Higgs boson H and the Goldstone bosons w Electronic address: [email protected] Electronic address: [email protected] Elect...

We present a calculation of the loop-induced processes gg → HH and gg → HHH , and investigate the observability of multi-Higgs boson production at the CERN Large Hadron Collider (LHC) in the Standard Model (SM) and beyond. While the SM cross sections are too small to allow observation at the LHC, we demonstrate that physics beyond the SM can lead to amplified, observable cross sections. Further...