Hamburg 2016 – scientific programme

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T: Fachverband Teilchenphysik

T 27: BSM Suchen III (Vektorartige Quarks)

T 27.5: Talk

Monday, February 29, 2016, 17:45–18:00, VMP6 HS B

Search for pair-produced Vector-like Quarks in boosted Topologies in pp-collisions at 13 TeV — Daniel Gonzalez, Johannes Haller, Ivan Marchesini, •Dominik Nowatschin, Alexander Schmidt, and Heiner Tholen — Universität Hamburg, Institut für Experimentalphysik

While a fourth generation of chiral quarks has been excluded by the discovery of the Higgs boson, vector-like quarks are still allowed by the present experimental data and are in fact a feature of many BSM models.

We present a search for pair-produced vector-like top partners (T’) with 13 TeV data at the CMS detector. The search is carried out in the lepton+jets channel and is most sensitive for final states where at least one T’ decays to a top quark and a Higgs boson.

If vector-like quarks exist, they are expected to have masses above ∼800 GeV since lighter particles have already been excluded by both ATLAS and CMS in LHC Run I. As a consequence, final states with large transverse momenta become more likely and the decay products of intermediate particles (like top quarks and Higgs bosons) tend to be very collimated. In order to resolve these boosted final states, jet-substructure techniques such as Higgs-tagging are employed in this analysis.