THE B(B)OVER-BAR-PAIR PRODUCTION AND THE HIGGS SIGNAL IN THE REACTIONE--]E+E-B(B)OVER-BAR AT LEPII AND NLC ENERGIES(E)

Results of calculations of all tree-level Standard Model diagrams for the reaction e+ e- -->e+ e- b bBAR in the energy range of LEPII and th e Next e+ e- Linear Collider are presented. The complete matrix elemen t was calculated by means of the software package CompHEP; phase space integration and event generation were carried out with the computer p rograms BASES/SPRING with additional regularizations necessary in orde r to handle singularities. The contributions of the dominating subsets of diagrams, the possible interference terms and their influence on t he Higgs signal are studied in detail. Agreement with results of previ ous calculations as well as with those derived from simple analytical approximations is demonstrated. Encouraging results were obtained rega rding the extraction of the Higgs signal from the overwhelming backgro und.