Publication at Faculty of Mathematics and Physics |
2011
Abstract
We measure the top quark mass (m(t)) in p (p) over bar collisions at a center of mass energy sqrt(s) = 1.96 TeV using dilepton t (t) over bar -} W(+)bW(-)b(-) -} l(+)nu(l)bl(-)(nu) over bar (l)(b) over bar events, where l denotes an electron, a muon, or a tau that decays leptonically. The data correspond to an integrated luminosity of 5.4 fb(-1) collected with the D0 detector at the Fermilab Tevatron Collider.
We obtain m(t) = 174.0 +/- 1.8(stat) +/- 2.4(syst) GeV, which is in agreement with the current world average m(t) = 173.3 +/- 1.1 GeV. This is currently the most precise measurement of mt in the dilepton channel.