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Search for a heavy resonance decaying to a top quark and a vector-like top quark in the lepton + jets final state in pp collisions at š ā=13TeV
Sirunyan, A. M. Sanders, Stephen J. CMS Collaboration
Sirunyan, A. M.
Sanders, Stephen J.
CMS Collaboration
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Abstract
A search is presented for a heavy spin-1 resonance Zā² decaying to a top quark and a vector-like top quark partner T in the lepton + jets final state. The search is performed using a data set of p p collisions at a centre-of-mass energy of 13TeV corresponding to an integrated luminosity of 35.9fbā1 as recorded by the CMS experiment at the CERN LHC in the year 2016. The analysis is optimised for final states arising from the T decay modes to a top quark and a Higgs or Z boson (TāHt,Zt). The event selection makes use of resolved and merged top quark decay products, as well as decays of boosted Higgs bosons and Z and W bosons using jet substructure techniques. No significant deviation from the standard model background expectation is observed. Exclusion limits on the product of the cross section and branching fraction for Zā²ātT,TāHt,Zt,Wb are presented for various combinations of the Zā² resonance mass and the vector-like T quark mass. These results represent the most stringent limits to date for the decay mode Zā²ātTātHt. In a benchmark model with extra dimensions, invoking a heavy spin-1 resonance Gā, masses of the Gā between 1.5 and 2.3TeV and between 2.0 and 2.4TeV are excluded for T masses of 1.2 and 1.5TeV, respectively.
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This work is licensed under a Creative Commons Attribution 4.0 International License.
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2019-03-07
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SpringerOpen
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Sirunyan, A.M., Tumasyan, A., Adam, W. et al. Search for a heavy resonance decaying to a top quark and a vector-like top quark in the lepton + jets final state in pp collisions at š ā=13TeV. Eur. Phys. J. C 79, 208 (2019). https://doi.org/10.1140/epjc/s10052-019-6688-5