Search for production of vector-like quark pairs and of four top quarks in the lepton-plus-jets final state in pp collisions at √s = 8 TeV with the ATLAS detector
Abstract
A search for pair production of vector-like quarks, both up-type (T) and down-type (B), as well as for four-top-quark production, is presented. The search is based on pp collisions at (Formula presented.) TeV recorded in 2012 with the ATLAS detector at the CERN Large Hadron Collider and corresponding to an integrated luminosity of 20.3 fb < sup >-1 < /sup > . Data are analysed in the lepton-plus-jets final state, characterised by an isolated electron or muon with high transverse momentum, large missing transverse momentum and multiple jets. Dedicated analyses are performed targeting three cases: a T quark with significant branching ratio to a W boson and a b-quark ($$T\bar{T}$$→Wb+X), and both a T quark and a B quark with significant branching ratio to a Higgs boson and a third-generation quark ($$T\bar{T}$$→Ht+Xand $$B\bar{B}$$→Hb+X respectively). No significant excess of events above the Standard Model expectation is observed, and 95% CL lower limits are derived on the masses of the vector-like T and B quarks under several branching ratio hypotheses assuming contributions from T → Wb, Zt, Ht and B → Wt, Zb, Hb decays. The 95% CL observed lower limits on the T quark mass range between 715 GeV and 950 GeV for all possible values of the branching ratios into the three decay modes, and are the most stringent constraints to date. Additionally, the most restrictive upper bounds on four-top-quark production are set in a number of new physics scenarios.
- Authors:
-
- Aix-Marseille Univ. and CNRS/IN2P3, Marseille (France). et al.
- Publication Date:
- Research Org.:
- Brookhaven National Lab. (BNL), Upton, NY (United States); Argonne National Lab. (ANL), Argonne, IL (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- Contributing Org.:
- The ATLAS collaboration
- OSTI Identifier:
- 1223386
- Alternate Identifier(s):
- OSTI ID: 1223380; OSTI ID: 1407387
- Grant/Contract Number:
- AC02-06CH11357; AC02-05CH11231; SC00112704; AC03-76SF00515
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of High Energy Physics (Online)
- Additional Journal Information:
- Journal Name: Journal of High Energy Physics (Online); Journal Volume: 2015; Journal Issue: 8; Journal ID: ISSN 1029-8479
- Publisher:
- Springer Berlin
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Hadron-Hadron Scattering
Citation Formats
Aad, G. Search for production of vector-like quark pairs and of four top quarks in the lepton-plus-jets final state in pp collisions at √s = 8 TeV with the ATLAS detector. United States: N. p., 2015.
Web. doi:10.1007/JHEP08(2015)105.
Aad, G. Search for production of vector-like quark pairs and of four top quarks in the lepton-plus-jets final state in pp collisions at √s = 8 TeV with the ATLAS detector. United States. https://doi.org/10.1007/JHEP08(2015)105
Aad, G. Thu .
"Search for production of vector-like quark pairs and of four top quarks in the lepton-plus-jets final state in pp collisions at √s = 8 TeV with the ATLAS detector". United States. https://doi.org/10.1007/JHEP08(2015)105. https://www.osti.gov/servlets/purl/1223386.
@article{osti_1223386,
title = {Search for production of vector-like quark pairs and of four top quarks in the lepton-plus-jets final state in pp collisions at √s = 8 TeV with the ATLAS detector},
author = {Aad, G.},
abstractNote = {A search for pair production of vector-like quarks, both up-type (T) and down-type (B), as well as for four-top-quark production, is presented. The search is based on pp collisions at (Formula presented.) TeV recorded in 2012 with the ATLAS detector at the CERN Large Hadron Collider and corresponding to an integrated luminosity of 20.3 fb < sup >-1 < /sup > . Data are analysed in the lepton-plus-jets final state, characterised by an isolated electron or muon with high transverse momentum, large missing transverse momentum and multiple jets. Dedicated analyses are performed targeting three cases: a T quark with significant branching ratio to a W boson and a b-quark ($T\bar{T}$→Wb+X), and both a T quark and a B quark with significant branching ratio to a Higgs boson and a third-generation quark ($T\bar{T}$→Ht+Xand $B\bar{B}$→Hb+X respectively). No significant excess of events above the Standard Model expectation is observed, and 95% CL lower limits are derived on the masses of the vector-like T and B quarks under several branching ratio hypotheses assuming contributions from T → Wb, Zt, Ht and B → Wt, Zb, Hb decays. The 95% CL observed lower limits on the T quark mass range between 715 GeV and 950 GeV for all possible values of the branching ratios into the three decay modes, and are the most stringent constraints to date. Additionally, the most restrictive upper bounds on four-top-quark production are set in a number of new physics scenarios.},
doi = {10.1007/JHEP08(2015)105},
journal = {Journal of High Energy Physics (Online)},
number = 8,
volume = 2015,
place = {United States},
year = {Thu Aug 20 00:00:00 EDT 2015},
month = {Thu Aug 20 00:00:00 EDT 2015}
}
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Search for standard model production of four top quarks with same-sign and multilepton final states in proton–proton collisions at $$\sqrt{s} = 13\,\text {TeV} $$ s = 13 TeV
journal, February 2018
- Sirunyan, A. M.; Tumasyan, A.; Adam, W.
- The European Physical Journal C, Vol. 78, Issue 2
Search for single production of vector-like quarks decaying to a top quark and a $$\mathrm {W} $$ W boson in proton–proton collisions at $$\sqrt{s} = 13 \,\text {TeV} $$ s = 13 TeV
journal, January 2019
- Sirunyan, A. M.; Tumasyan, A.; Adam, W.
- The European Physical Journal C, Vol. 79, Issue 2
Gauge-Singlet Vector-Like Fermion Dark Matter, LHC Diphoton Rate, and Direct Detection
journal, January 2017
- Gopalakrishna, Shrihari; Mukherjee, Tuhin Subhra
- Advances in High Energy Physics, Vol. 2017
From the Trees to the Forest: A Review of Radiative Neutrino Mass Models
journal, December 2017
- Cai, Yi; Herrero García, Juan; Schmidt, Michael A.
- Frontiers in Physics, Vol. 5