Search for vectorlike charge 2/3 T quarks in proton-proton collisions at root(s)=8 TeV

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Abstract

A search for fermionic top quark partners T of charge 2/3 is presented. The search is carried out in proton-proton collisions corresponding to an integrated luminosity of 19.7 fb(-1) collected at a center-of-mass energy of root s = 8 TeV with the CMS detector at the LHC. The T quarks are assumed to be produced strongly in pairs and can decay into tH, tZ, and bW. The search is performed in five exclusive channels: a single-lepton channel, a multilepton channel, two all-hadronic channels optimized either for the bW or the tH decay, and one channel in which the Higgs boson decays into two photons. The results are found to be compatible with the standard model expectations in all the investigated final states. A statistical combination of these results is performed and lower limits on the T quark mass are set. Depending on the branching fractions, lower mass limits between 720 and 920 GeV at 95 confidence level are found. These are among the strongest limits on vectorlike T quarks obtained to date.

Autore Pugliese

Tutti gli autori

  • POMPILI A.;SELVAGGI G.;ABBRESCIA M.;DE PALMA M.;MY S.;NUZZO S.V.

Titolo volume/Rivista

Non Disponibile

Anno di pubblicazione

2016

ISSN

2470-0010

ISBN

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Numero di citazioni Wos

28

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Numero di citazioni Scopus

63

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Settori ERC

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Codici ASJC

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