arXiv subjects

P. Overmann

Publications and source records attributed to P. Overmann.

3 recordsLinked to original sources

arXiv1997

CP Violation in radiative Z Decays

We propose to test the CP symmetry in the reactions Z -> mu+ mu- gamma and Z -> tau+ tau- gamma. The experimental analysis of angular correlations allows to determine a set of effective couplings: the electric and weak dipole moments of the muon and the tau lepton, and in particular chirality conserving 4-particle couplings, all of which can be induced by CP--violation in renormalizable theories of electroweak interactions beyond the Standard Model. We update an indirect bound on the weak dipole moment of the muon.

hep-ph↗

arXiv1996

CP Violation Beyond the Standard Model and Tau Pair Production in $e^+ e^-$ Collisions

We show that the CP-violating dipole form factors of the tau lepton can be of the order of $α/π$ in units of the length scale set by the inverse $Z$ boson mass. We propose a few observables which are sensitive to these form factors at LEP2 and higher e^+e^- collision energies.

hep-ph↗

arXiv1996

CP Nonconservation in Top Quark Production by (Un) Polarized $e^+e^-$ and $γγ$ Collisions

We report on an investigation of CP violation in (un)polarized $e^+e^-\to{\bar t}t$ resulting from an extended neutral Higgs sector or from the minimal SUSY extension of the Standard Model (SM). We consider c.m. energies from the ${\bar t}t$ threshold to the TeV range. In addition sensitivity estimates for CP-violating form factors of the top quark are made. Further we discuss the prospects of probing Higgs sector CP violationin $γγ\to{\bar t}t$.

hep-ph↗