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T: Fachverband Teilchenphysik

T 35: Top-Quark: Produktion 4

T 35.7: Vortrag

Donnerstag, 1. März 2012, 18:20–18:35, ZHG 104

Searching for tt resonances in the ATLAS experiment at √s = 7 TeV — •Luz Stella Gomez Fajardo — Desy, Zeuthen, Germany

New resonances decaying into top quark pairs (tt) are predicted by many models beyond the standard model and its pursuit is one of the targets of the ATLAS experiment at the CERN Large Hadron Collider (LHC). For this goal, two final topologies are considered: e+jets and µ+jets, resulting from the decay chain in which one of the W bosons from top quark decay decays into an electron or a muon and a neutrino, and the other decays hadronically. This study searches for a resonance in the tt mass spectrum where the tt pair is reconstructed from identified decay products: jets, leptons and a neutrino.

This presentation describes the search for the tt resonances in the l+jets final states along with the topology of the highly boosted top candidates where rather than trying to resolve the jets individually, the complete decay products is reconstructed as a single fat jet. For this analysis data collected by the ATLAS experiment in 2011 at √s= 7 TeV pp collisions are used. A description of the data-driven studies of the background as well as comparisons of the data with the expectations will be shown.