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Search for vector-like charge 2/3 T quarks in proton-proton collisions at sqrt(s) = 8 TeV

Search for vector-like charge 2/3 T quarks in proton-proton collisions at sqrt(s) = 8 TeV
Search for vector-like charge 2/3 T quarks in proton-proton collisions at sqrt(s) = 8 TeV
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 √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.
2470-0029
012003
Khachatryan, Vardan
375bcfe5-df1a-41ad-9a90-553e557ef6d6
Belyaev, Alexander
6bdb9638-5ff9-4b65-a8f2-34bae3ac34b3
The CMS Collaboration
Khachatryan, Vardan
375bcfe5-df1a-41ad-9a90-553e557ef6d6
Belyaev, Alexander
6bdb9638-5ff9-4b65-a8f2-34bae3ac34b3

The CMS Collaboration (2016) Search for vector-like charge 2/3 T quarks in proton-proton collisions at sqrt(s) = 8 TeV. Physical Review D, D93 (1), 012003. (doi:10.1103/PhysRevD.93.012003).

Record type: Article

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 √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.

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Published date: 19 January 2016
Organisations: Physics & Astronomy

Identifiers

Local EPrints ID: 408345
URI: http://eprints.soton.ac.uk/id/eprint/408345
ISSN: 2470-0029
PURE UUID: 8aec49e7-2abf-4611-822b-c981b44d7902
ORCID for Alexander Belyaev: ORCID iD orcid.org/0000-0002-1733-4408

Catalogue record

Date deposited: 19 May 2017 04:04
Last modified: 17 Dec 2019 01:44

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