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T: Fachverband Teilchenphysik

T 11: Top Quark Tagging

T 11.3: Vortrag

Montag, 29. Februar 2016, 11:30–11:45, VMP8 SR 05

Search for Heavy Resonances with the HEPTopTagger in pp collisions at √s = 13 TeV with the ATLAS Experiment — Christoph Anders, Danilo Ferreira de Lima, Sebastian Schätzel, André Schöning, and •David Sosa — Physikalisches Institut, Universität Heidelberg

A search for heavy resonances where two top quarks decay hadronically is carried out using the full 2015 proton-proton ATLAS dataset. The HEPTopTagger is used to reconstruct the tt system and to reduce the large multijet background. Top quark candidates are required to be close to a track jet identified as resulting from a b-hadron. It is shown that track jet b-tagging performs significantly better than the previously used calorimeter jet b-tagging at higher top quark transverse momenta. The dominant contributions, tt and multijet production, are validated and estimated using control regions in data. Finally, the measured distributions are compared to expected Standard Model backgrounds and several New Physics models.