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 = 13 TeV

Sirunyan, A. M. and Tumasyan, A. R. and Adam, Wolfgang and Ambrogi, Federico and Asilar, Ece and Md. Ali, Mohd. Adli (2019) 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 = 13 TeV. European Physical Journal C, 79 (3). pp. 1-32. ISSN 1434-6044 E-ISSN 1434-6052

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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 pp collisions at a centre-of-mass energy of 13 TeV corresponding to an integrated luminosity of 35.9 fb−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 → Ht, 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 Z → tT, T → Ht, Zt, Wb 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 → tT → tHt. In a benchmark model with extra dimensions, invoking a heavy spin-1 resonance G∗, masses of the G∗ between 1.5 and 2.3 TeV and between 2.0 and 2.4 TeV are excluded for T masses of 1.2 and 1.5 TeV, respectively

Item Type:	Article (Journal)
Additional Information:	7861/71727
Uncontrolled Keywords:	Heavy resonance; Top quark; Vector-like top quark; Lepton + jets final state;
Subjects:	Q Science > Q Science (General) Q Science > QC Physics
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Science Kulliyyah of Science > Department of Physics
Depositing User:	Dr Mohd Adli MD Ali
Date Deposited:	22 Apr 2019 11:32
Last Modified:	12 Jul 2019 10:41
URI:	http://irep.iium.edu.my/id/eprint/71727

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