Forward tracking at the next e+ e- collider part I: the physics case

In a series of notes we explore the detector requirements of the forward tracking region for a future $e^+ e^-$ collider with a center-of-mass energy in the range from 500 GeV to 3 TeV. In this first part we investigate the relevance of the forward region for a range of physics processes that are likely to be relevant in such a machine. We find that many examples can be found where excellent performance of the forward detector system may lead to a considerable increase of the physics output of the experiment. A particularly clear physics case can be made for the reconstruction of electrons at small polar angle.Comment: category: instrumentation

e"+e"- physics at LEP and a future linear collider

A summary of results obtained from e"+e"- annihilations at LEP is given. The precision measurements around the Z resonance, the results from charged gauge boson production and searches for new particles are reviewed. Particular emphasis is devoted to the Higgs boson. The prospects of an e"+e"- linear collider in the energy range of about 1 TeV are discussed. (orig.)Available from TIB Hannover: RA 2999(01-218) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman

Charged current couplings in #tau# decay

We discuss the impact of the recent measurements of the Michel parameter in #tau# decay. These measurements are used to extract limits on the charged current couplings beyond the Standard Model, first in a model independent way and then with some additional but very general assumptions. The measurements substantiate the Standard Model V-A hypothesis and restrict right handed couplings of the #tau#. On the other hand, left handed scalar and tensor couplings of the #tau# channot be bounded in the model independent framework with presently available data. (orig.)23 refs.Available from TIB Hannover: RA 2999(95-188) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman