Date of this Version
PHYSICAL REVIEW LETTERS 107, 082004 (2011); DOI: 10.1103/PhysRevLett.107.082004
We measure the top quark mass (mt) in pp̅ collisions at a center of mass energy √s= 1.96 TeV using dilepton tt̅ →W+bW-b̅→ℓ+vℓbℓ-v̅ℓb̅ events, where ℓ denotes an electron, a muon, or a tau that decays leptonically. The data correspond to an integrated luminosity of 5:4 fb1 collected with the D0 detector at the Fermilab Tevatron Collider. We obtain mt= 174.0±1.8(stat) ± 2.4 (syst) GeV, which is in agreement with the current world average mt = 173.3 ± 1.1 GeV. This is currently the most precise measurement of mt in the dilepton channel.