First and foremost I would like to thank my advisor Meenakshi Narain. When I showed up six years ago I had never taken a course on particle physics, had almost no experience with programing (beyond writing code to output ’Hello World ’ or compute the Fibonacci sequence, and had limited knowledge of statistical inference (reading the mean and r.m.s. of a histogram). Almost everything that I have learned about the practice of experimental physics is due to her. As well, she was always encouraging-from the time I when there was no evidence of this particles whose mass I was suppose to measure in our data through the debugging and cross-checking of the final result. Without her guidance I most likely would have been lost and discouraged. Secondly I would like to thank my committee members for a careful reading of my thesis and making me think critically about my work: Ulrich Heintz, Robert Carey, Claudio Rebbi, and Bennet Goldberg. As well, there are several important people who have helped me along the way at the DØ experiment. Aurelio Juste who scrutinized every plot, corrected every reference, and was instrumental in starting this analysis. Slava Kulik and Martij
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