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 √ s=13TeV

CMS Collaboration

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Abstract

A search is presented for a heavy spin-1 resonance Z 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 35.9fb-1 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 (T → H t , Z t). 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 Z → t T , T → H t , Z t , W b are presented for various combinations of the Z resonance mass and the vector-like T quark mass. These results represent the most stringent limits to date for the decay mode Z → t T → t H t. In a benchmark model with extra dimensions, invoking a heavy spin-1 resonance G , masses of the G 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.

Original languageEnglish
Article number208
JournalEuropean Physical Journal C
Volume79
Issue number3
DOIs
Publication statusPublished - 2019 Mar 1

Bibliographical note

Funding Information:
Preparation of this article was supported by the Department of Veterans Affairs, Veterans Health Administration, Office of Research and Development, Biomedical Laboratory Research and Development Service (M.J.B), St. John of God HealthCare (N.Z.) and the National Center for Advancing Translational Sciences of the National Institutes of Health under Award Number UL1 TR000445 (E.C.). The authors are funded by their affiliated institutions. The viewpoints expressed herein represent the authors’ personal perspectives and should not be taken as representing the official viewpoint or position of the Department of Veterans Affairs or the National Institutes of Health. Thanks to Kristina Hill for her assistance in gathering data for the article.

Publisher Copyright:
© 2019, CERN for the benefit of the CMS Collaboration.

All Science Journal Classification (ASJC) codes

  • Engineering (miscellaneous)
  • Physics and Astronomy (miscellaneous)

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