Dresden 2013 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 9: Eingeladene Vorträge 4

T 9.5: Eingeladener Vortrag

Donnerstag, 7. März 2013, 15:45–16:15, HSZ-02

Searches for top quark resonances in boosted topologies with the ATLAS detector — •Elin Bergeaas Kuutmann — Humboldt-Universität zu Berlin

After three successful years of data-taking, the ATLAS experiment at the LHC is now able to conduct searches for physics beyond the Standard Model at energies never explored before, and many proposed theories for new physical phenomena have been excluded using LHC data. In order to fully exploit the potential of the LHC, we now need to develop new more advanced algorithms for the reconstruction of the very high-energetic tail of the data.

In several proposed extensions of the Standard Model (such as extra dimensions, the little Higgs scenario or technicolor) new heavy bosons emerge, heavy enough to decay into top quark pairs (tt). When massive (m>1 TeV) particles decay into tt, the top quarks can be boosted and the decay products often become merged in the detector. In such a case, the standard top reconstruction algorithms might fail. Dedicated methods for reconstructing boosted top quarks are described in the talk.

Two of the new models investigated predict the existence of Kaluza-Klein gluons and a new heavy vector boson, Z^′. The current limits on these hypothetical particles will be discussed and the future for searches involving high-energetic top quarks outlined.