ICHEP 2010 - 35th International Conference on High Energy Physics

Date de début :

23/07/2010 11:00

Date de fin :

23/07/2010 12:00

Lieu :

Palais des Congrès - Porte Maillot

Ville :

Paris (France)

Producteur :

L'Institut national de physique nucléaire et de physique des particules

Durée :

0:23:06

Type :

video/mp4

Format :

mp4

Résolution :

720x576

Top quark study at CMS

The top quark is a fundamental building block of the standard model. Due to the large cross section, top-antitop pairs will be copiously produced in high energy proton-proton collisions at the Large Hadron Collider (LHC). We present the first results of a selection of top-quark pair production events in the dilepton channel, where both W-bosons from the top quarks decay leptonically into either an electron or a muon, plus a neutrino. We use LHC collision data at 7 TeV centre-of-mass energy collected with the CMS experiment during the period of April to July 2010. Events with two isolated, prompt leptons with high energy, at least two jets with high transverse momentum, and significant missing transverse energy are selected. Several background contributions from other standard model processes, most importantly Drell-Yan and W+jets, are estimated in a data-driven way. Results obtained from data are compared with the simulation, indicating the status of the analysis towards a first cross section measurement in this channel at sqrt(s) = 7 TeV. Similarly, first results are reported for the lepton+jets channel, where one W-boson from the top decays leptonically into a muon (or electron) and a neutrino, while the other one decays into a quark-antiquark pair.

CHRISTIANSEN, Tim

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