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
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...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English English English |
| Published: |
Springer Nature
2019
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/71727/ http://irep.iium.edu.my/71727/ http://irep.iium.edu.my/71727/ http://irep.iium.edu.my/71727/1/71727_Search%20for%20a%20heavy%20resonance%20decaying_article.pdf http://irep.iium.edu.my/71727/2/71727_Search%20for%20a%20heavy%20resonance%20decaying_wos.pdf http://irep.iium.edu.my/71727/3/71727_Search%20for%20a%20heavy%20resonance%20decaying_scopus.pdf |
| Summary: | 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 |
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