| This dissertation describes a measurement of the mass of the top quark using events consistent with the hypothesis tt¯ → bW + b¯W- → bl+nu b¯l -nu, where (l = e, mu). The events are obtained from nearly 230 pb-1 of pp¯ collision data collected by the DO experiment between 2002 and 2004 during Run II. In this decay channel two neutrinos remain undetected. Extraction of the mass of the top quark by kinematic reconstruction is not possible because the event is under-constrained. Therefore, a dynamical likelihood method is developed to obtain the mass of the top quark. The mass of top quark obtained from the candidate events selected in the di-electron channel and the emu channel is: 154.1+14.2-12.8st at.+/-6.6sys t.GeV. |
