Amherst in partial fulllment of the requirements for the degree of DOCTOR OF PHILOSOPHY September 1996 Department o f P h ysics and Astronomy ACKNOWLEDGMENTS First and foremost, I am very grateful to my advisor, Janice Button-Shafer, for bringing me into the collaboration and making it possible for me to obtain my degree from experiment E143. I am thankful for the important guidance which she provided for me. I thank all the committee members for their help and support. I truly appreciate Charlie Young for serving on my committee and traveling to Massachusetts for my dissertation defense. His guidance throughout the analysis work was very valuable to me. The experiment w as performed by the whole collaboration, and I would like to thank everyone in the collaboration, but also all the SLAC personnel for their eort and work. It was a very enjoyful time for me. I w ould like to thank the spokespersons of the experiment, Ray Arnold and Oscar Rondon, especially Ray for his quiet, but ecient w a y of helping the group to run a smooth and successful experiment. I am grateful to the many members of the collaboration who took the time to discuss the physics and analysis with me, especially Peter Bosted and Steve R o c k. I thank all the people who answered my n umerous questions and gave me suggestions for my dissertation. What would be the experiment without all the graduate students? It was a pleasure to work with the fellow graduate students on the experiment and the subsequent analysis: