Werner Bernreuther

Decoupling of heavy quarks in the minimal subtraction scheme

We investigate decoupling of a heavy quark in QCD renormalized by minimal subtraction. The relation between the coupling αMS and the effective coupling αMS− characterizing the theory below the heavy quark threshold is discussed to all orders of perturbation theory. This relation can be used to systematically determine the scale parameter ΛMS− of the effective theory in terms of the scale parameter of the theory which includes the heavy quark, or vice versa. For phenomenological applications we plot corresponding results valid to two and three loops.

Strongly interacting Higgs sector andW-pair production ine+e−-collisions

Within the strongly-interacting electroweak symmetry breaking scenario (SIH) we investigate a few observables which are sensitive to SIH effects ine+e−→W+W− at TeV collision energies.

Fermion-meron interactions in Minkowski space-time

Abstract The interaction between massless isospinor fermions and a class of regular (classical) Yang-Mills fields in Minkowski space-time is analyzed. For the case in which the potential corresponds to the meron field of DeAlfaro, Fubini and Furlan the resulting Dirac equations are solved in general. Some properties of the general solution and the ensuing physical picture are briefly discussed.

Improved effective vector boson approximation revisited

We reexamine the improved effective vector boson approximation which is based on two-vector-boson luminosities

Probing Higgs Boson - and Supersymmetry-Induced CP Violation

\mathrm{\mathbf{L}}_{\rm pol}

Production of heavy Higgs bosons and decay into top quarks at the LHC. II: top-quark polarization and spin correlation effects

for the computation of weak gauge-boson hard scattering subprocesses

Note on classical solution of the Yang-Mills equations in Minkowski space

V_1 V_2\to {\cal W}

Probing Higgs sector CP violation with top quarks at a photon linear collider

in high-energy hadron-hadron or

Effect of massive quarks on the vacuum polarization of chiral currents

e^-e^+

Determination of the CP parity of Higgs bosons in their tau decay channels at the ILC

collisions. We calculate these luminosities for the nine combinations of the transverse and longitudinal polarizations of