Aug 23 – 28, 2010
Europe/Berlin timezone

Top, W and Z in ATLAS

Aug 24, 2010, 2:00 PM
Kl. Hörsaal Mathematik (Bonn)

Kl. Hörsaal Mathematik


Nussallee 12


Dr Sara Strandberg (LBNL)


Top quarks are expected to be produced copiously at the LHC, even at the lower beam energy and luminosity expected in the first year of running. Establishing the top-pair signal and measuring the production cross-section will be important benchmarks for ATLAS, which will also help understand the detector performance for events with high-pT leptons, high jet multiplicity, missing transverse energy and b-jets. With more data, the single top production process will also become observable, allowing detailed studies of electroweak top quark production and measurement of the CKM matrix element Vtb. The prospects for these early top physics measurements will be shown, with a particular emphasis on the progress achieved with data so far. The top quark is unique in the Standard Model by virtue of its large mass, possible role in electroweak symmetry breaking, and rapid decay without forming bound states. Precise measurements of its properties offer both sensitive tests of the Standard Model and possible pathways to discovering new physics, and are an important and challenging part of the ATLAS physics program. The prospects for measurements of the top quark mass, top quark decay properties such as polarization, spin correlations and anomalous couplings, and rare top decays signaling beyond-Standard Model physics, will be described The first measurement of the production cross-sections for W and Z bosons in proton proton interactions at sqrt(s) = 7 TeV are reported from the ATLAS experiment. Based on its excellent capability for reconstructing both high pT electrons and muons, the electron and the muon decay modes of the W/Z bosons are compared. First results for the ratio of W/Z production and of W+/W- production will also be described.

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