Measurement of the top quark mass in the dilepton channel in pp collisions at sqrts=7TeV

We present a measurement of the top quark mass $m_{\rm top}$ in the dilepton decay channel $t\bar{t}\rightarrow(l^{+}\nu_l b)~(l^{-}\bar{\nu}_l \bar{b})$ in pp collisions at $\sqrt{s}=7$~TeV. The data sample of the measurement corresponds to an integrated luminosity of 2.3~fb$^{-1}$ collected with the CMS detector at the LHC. Events are selected by requiring two leptons, at least two jets and missing transverse energy. The mass is reconstructed from the kinematic characteristics of the events with a full kinematic analysis. A set of templates is constructed from simulated samples and a likelihood fit is performed to derive the mass. The result yields a measurement of $m_{\rm top}=173.3\pm 1.2({\rm stat.}) ^{+2.5}_{-2.6}({\rm syst.})~\text{GeV}\!/\!c^2$.