Göttingen 2012 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 35: Top-Quark: Produktion 4
T 35.9: Vortrag
Donnerstag, 1. März 2012, 18:50–19:05, ZHG 104
Search for tt resonance in the lepton plus jets channel in ATLAS — Tobias Heck1, •Weina Ji1, Lucia Masetti1, Elin Bergeaas Kuutmann2, Thorsten Kuhl2, Luz Stella Gomez2, Marcello Barisonzi3, Thorsten Boek3, Andrey Khoroshilov3, Peter Mättig3, Markus Mechtel3, and Daniel Wicke3 — 1Institut für Physik, Universität Mainz — 2Deutsches Elektronen-Synchrotron, Zeuthen — 3Bergische Universität Wuppertal
The Large Hadron Collider is opening up a new energy regime for exploring possible signatures of new physics. Many theoretical models of physics beyond the Standard Model have predicted the existence of new heavy particles which strongly couple to top quarks. In this talk, we summarise the search for such resonances decaying into tt pairs in proton-proton collisions at a centre-of-mass energy of 7 TeV collected by the ATLAS experiment in 2011. The search is performed in the lepton plus jets final state with the tt pair reconstructed from individually resolved decay products. Limits at 95% confidence level are set on the production cross-section times branching ratio to top quark pairs for leptophobic topcolor Z′ bosons and Kaluza-Klein gluons.