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We present a measurement of the top quark mass using 19.7 $\pm$ 0.5 fb$^{-1}$of $\sqrt{s} = 8$ TeV CMS data. In particular, we study dileptonic $t\bar{t}$decays, in which a top-antitop pair decays to a final state containing twoelectrons or muons. We use the Analytical Matrix Weighting Technique (AMWT),and have performed the first blind top mass measurement at CMS. The mass of thetop quark is measured as $m_t = 172.47 \pm 0.17(\text{stat}) \pm1.40(\text{syst})$ GeV.

Measurement of the Top Quark Mass From Dileptonic $t\bar{t}$ Decays With 2012 CMS Data