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 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 → 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.
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
Ravera F.;Meridiani P.;Amapane N.;Argiro S.;Bellan R.;Cappati A.;Costa M.;Covarelli R.;Kiani B.;Migliore E.;Monaco V.;Monteil E.;Obertino M. M.;Pacher L.;Angioni G. L. P.;Romero A.;Sacchi R.;Salvatico R.;Shchelina K.;Sola V.;Solano A.;Soldi D.;Rumerio P.;
2019-01-01
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 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 → 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.File | Dimensione | Formato | |
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