Top quark production in the reaction e"+e"-#->#e#nu#tb at linear collider energies

Abstract

The complete tree-level cross sections for the reaction e"+e"- #-># e#nu#tb are computed for top masses of 160 to 200 GeV at center-of-mass energies between 0.2 and 2.0 TeV using the packages CompHEP and GRACE. It is demonstrated that t anti t-pair production dominates around #sq root#s = 0.5 TeV, whereas soft photon t-channel exchange contributions grow with increasing energy such that above 1.5 TeV it dominates. Detailed cross section considerations close to the t anti t threshold reveals some peculiar properties. It is shown that a precise top quark mass determination is not significantly hampered by the existence of non-t anti t diagrams. With desirable assumptions on linear collider luminosities the CKM matrix element vertical stroke V_t_b vertical stroke might be measured best at or close to #sq root#s = 2 TeV. (orig.)23 refs.Available from TIB Hannover: RA 2999(95-151) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman