SLD is a magni cent piece of craft, and I wish to thank all men and women who participated in its designing and manufacturing. Regarding this analysis, I wish to thank Su Dong for bringing the topic to my attention, for his availability in spite of all the workload, and for the countless contributions to the analysis. I especially wish to thank Dave Muller for the help with numerous details in the applications of the CRID system in the physics studies, and for thoroughly revising the entire chapters on the analysis method and on the electron and muon identi cation, which resulted in a number of signi cant corrections to the previous calculations. Very special thanks go to Chris Damerell, for reviewing the entire document, and for the great experience while working with him on the VXD3. I wish to thank Professor John Donoghue for useful inputs in phenomenology and theory, and other members of the dissertation committee: Professor Monroe Rabin, Professor Charles Weems, Professor Richard Ko er, and Professor Stephane Willocq, for thoroughly reading the manuscript, and for a number of truly useful suggestions that improved both its content and the form. I also want to thank Achim Wiedemann for the help with the details of the luminosity measurement, and Danning Dong for supplying me with ready and easy to use fragmentation functions, which w ere essential in the systematic studies of this analysis. Some cross-checks in the lepton identi cation studies were done using event data that I got from Timothy Barklow, and I want to thank him as well. Very special thanks go to Ray Cowan for the help with the L A T E X issues, and for all his availability a n d time spent formating this document. Many thanks go to Mike Hu er, from whom I adopted philosophy of dealing with programming tasks in hierarchical and object oriented manner.