Title: "Top quark mass measurement in dilepton channel"

Abstract:

We present a top quark mass measurement using 1.2 fb^-1 of data collected by the CDF experiment. The measurement uses ttbar event candidates which have two high transverse momentum leptons, at least two jets and missing transverse energy from escaping neutrinos. Reconstruction of the top quark mass from dilepton events involves an underconstrained system. In this analysis, it is resolved by introducing an additional equation for the longitudinal momentum of the ttbar system. The sample is separated into b-tagged and non-tagged sub-samples, and the top quark mass is reconstructed for each event. The measured top mass from 70 candidate events is Mtop=169.1 +5.2-4.9 (stat.) +-3.1 (syst.) GeV/c^2.