We study electroweak parameters sensitive to the radiative corrections, such as ρratio and H → f f̄ decay rates in the MS-scheme in the heavy t-quark mass limit mt ≫ mw. In MS-scheme the two-loop electroweak corrections ∼ mt dominate over the QCD corrections ∼ αsmt in the ρ-ratio. The relation between the on-shell coupling constants and MS-parameters is found to be rather sensitive to the Higgs ...

New experimental data on medium to heavy single Λ hypernuclei revealed a much larger spin-orbit splitting than observed in older measurements of light hypernuclei. Taking into account particle threshold effects and the density-dependence of inmedium coupling constants the apparent suppression of spin-orbit strength in light hypernuclei as well as the spin-orbit structure observed in medium to h...

In a two-dimensional two-component plasma, the second moment of the density correlation function has the simple value {12π[1 − (Γ/4)]2}−1, where Γ is the dimensionless coupling constant. This result is derived by using analogies with critical systems.

I review how electroweak precision observables can be used to constrain the Higgs boson mass and the strong coupling constant. Implications for physics beyond the Standard Model are also addressed.

The possibility that the mass hierarchy is intimately associated with the compositeness level of the matters is proposed in supersymmetric gauge theory. This implies, for instance, that the preons constituting top quark consists of the “prepreons” binded by the same gauge force making the charm quark out of another preons. The exemplifying toy model illustrates how the hierarchy in the yukawa c...