Freiburg 2008 – scientific programme
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T: Fachverband Teilchenphysik
T 48: Suche nach neuer Physik V
T 48.3: Talk
Friday, March 7, 2008, 14:35–14:50, KGII-Audimax
Search for scalar top admixture in the tt→ℓ+jets channel with the DØ detector — •Su-Jung Park1,2 and Regina Demina2 — 1II. Physikalisches Institut, Universität Göttingen — 2University of Rochester, NY, USA
We report on a search for scalar top quark pair production in the lepton+jets channel. Just like Standard Model top quarks, scalar top quarks are produced in pairs in proton-antiproton collisions. One of the preferred scenarios is for the scalar top to decay to a b-quark and a chargino, with the chargino subsequently decaying into a real or virtual W boson and a neutralino. The neutralino escapes without being detected. Thus, the final state signature can be a lepton, two b-jets, two light quark jets and missing transverse energy, which is identical to the signature of Standard Model tt production. We use the kinematic differences between the exotic and the Standard Model scenarios to separate the two.