Mainz 2014 – scientific programme
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T: Fachverband Teilchenphysik
T 63: Top-Quarks: Paarproduktion
T 63.6: Talk
Tuesday, March 25, 2014, 18:00–18:15, P104
Search for tt resonances in the full hadronic final state with the CMS Detector — Rebekka Höing, Ivan Marchesini, Alexander Schmidt, and •Emanuele Usai — Universität Hamburg
A search for new physics in the form of high-mass particles decaying to highly-energetic top quark-antiquark pairs is performed using 19.7 fb−1 of proton-proton collisions at a center-of-mass energy of 8 TeV collected with the CMS detector.
In this search the decay products of the top quarks are boosted and cannot be reconstructed as separate jets. Top tagging algorithm are then used to reconstruct the top decay.
For moderately boosted regimes the HEPTopTagger algorithm is used, while for higly boosted regimes the CMSTopTagger is used.
Jet substructure tools, in addition to newly developed techniques of b-tagging in boosted topologies, are employed to reduce the QCD multijet background and improve the sensitivity of the analysis.
Exclusion limits are set for several physics models, including both wide and narrow Z’ resonance production.