abstract

After a brief review of the standard model’s prediction for toponium, various consequences of supersymmetry on toponium S- and P-state decays are discussed. Depending on the mass of scalar quarks and gluinos, supersymmetry could have minor effects on toponium decays or alter its properties completely. We then predict the properties and production mechanisms of onia which are specific to supersymmetry: squarkonia and gluino balls.

abstract

It is shown how to combine Monte Carlo techniques with methods based on spin amplitudes in order to calculate radiatively corrected, integrated, and/or differential QED cross sections efficiently for heavy lepton t production in an electron-positron annihilation process. A particular emphasis is put on those aspects which are potentially important for future developments for this process, for applications to similar processes (production of heavy quarks), and for other QED processes where mass and spin effects are also important (in addition to the radiative ones).