Hamburg 2016 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 81: BSM Suchen V (Leptoquarks und exotische top-Quarks)

T 81.8: Vortrag

Mittwoch, 2. März 2016, 18:30–18:45, VMP9 SR 28

Search for a Z’ heavy resonance decaying to top and vector-like quarks in the all hadronic channel at 13 TeV with CMS — Ivan Marchesini, Alexander Schmidt, and •Emanuele Usai — Universität Hamburg

Many models predicting a heavy neutral spin-1 resonance also predict the existence of vector-like quarks. A hypothetical resonance might then predominantly decay to these heavy quark partners rather than SM particles.

We present a search for a Z’ heavy resonance decaying in a top and a heavy vector-like top partner (T’). The analysis is tailored for the final state where the T’ decays in a W boson and a b quark. We focus on the all hadronic channel where both the top and the W quark coming from the T’ decay hadronically.

In this kind of searches, the decay products of the top quark and the W boson are highly boosted and cannot be reconstructed as separate jets. Top and boson tagging algorithms are then used to reconstruct the decays.

Jet substructure tools, in addition to b-tagging in boosted topologies, are employed to reduce the QCD multijet background and improve the sensitivity of the analysis.