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    Search for pair production of up-type vector-like quarks and for four-top-quark events in final states with multiple b-jets with the ATLAS detector

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    Author
    Aaboud, M.
    Aad, G.
    Abbott, B.
    Abdinov, O.
    Abeloos, B.
    Abidi, S. H.
    AbouZeid, O. S.
    Abraham, N. L.
    Abramowicz, H.
    Abreu, H.
    Abulaiti, Y.
    Acharya, B. S.
    Adachi, S.
    Adamczyk, L.
    Adelman, J.
    Adersberger, M.
    Adye, T.
    Affolder, A. A.
    Afik, Y.
    Agheorghiesei, C.
    Aguilar-Saavedra, J. A.
    Ahmadov, F.
    Aielli, G.
    Akatsuka, S.
    Åkesson, T. P. A.
    Akilli, E.
    Akimov, A. V.
    Alberghi, G. L.
    Albert, J.
    Albicocco, P.
    Alconada Verzini, M. J.
    Alderweireldt, S.
    Aleksa, M.
    Aleksandrov, I. N.
    Alexa, C.
    Alexander, G.
    Alexopoulos, T.
    Alhroob, M.
    Ali, B.
    Aliev, M.
    Alimonti, G.
    Alison, J.
    Alkire, S. P.
    Allaire, C.
    Allbrooke, B. M. M.
    Allen, B. W.
    Allport, P. P.
    Aloisio, A.
    Alonso, A.
    Alonso, F.
    Alpigiani, C.
    Alshehri, A. A.
    Alstaty, M. I.
    Alvarez Gonzalez, B.
    Álvarez Piqueras, D.
    Alviggi, M. G.
    Amadio, B. T.
    Amaral Coutinho, Y.
    Ambroz, L.
    Amelung, C.
    Amidei, D.
    Amor Dos Santos, S. P.
    Amoroso, S.
    Amrouche, C. S.
    Anastopoulos, C.
    Ancu, L. S.
    Andari, N.
    Andeen, T.
    Anders, C. F.
    Anders, J. K.
    Anderson, K. J.
    Andreazza, A.
    Andrei, V.
    Angelidakis, S.
    Angelozzi, I.
    Angerami, A.
    Anisenkov, A. V.
    Annovi, A.
    Antel, C.
    Anthony, M. T.
    Antonelli, M.
    Antrim, D. J. A.
    Anulli, F.
    Aoki, M.
    Aperio Bella, L.
    Arabidze, G.
    Arai, Y.
    Araque, J. P.
    Araujo Ferraz, V.
    Araujo Pereira, R.
    Arce, A. T. H.
    Ardell, R. E.
    Arduh, F. A.
    Arguin, J-F.
    Argyropoulos, S.
    Armbruster, A. J.
    Armitage, L. J.
    Arnaez, O.
    Arnold, H.
    Arratia, M.
    Show allShow less
    Affiliation
    Univ Arizona
    Issue Date
    2018-07-12
    Keywords
    Beyond Standard Model
    Hadron-Hadron scattering (experiments)
    vector-like quarks
    
    Metadata
    Show full item record
    Publisher
    SPRINGER
    Citation
    The ATLAS collaboration, Aaboud, M., Aad, G. et al. J. High Energ. Phys. (2018) 2018: 89. https://doi.org/10.1007/JHEP07(2018)089
    Journal
    JOURNAL OF HIGH ENERGY PHYSICS
    Rights
    © The Author(s) 2018.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    A search for pair production of up-type vector-like quarks (T) with a significant branching ratio into a top quark and either a Standard Model Higgs boson or a Z boson is presented. The same analysis is also used to search for four-top-quark production in several new physics scenarios. The search is based on a dataset of pp collisions at root s = 13TeV recorded in 2015 and 2016 with the ATLAS detector at the CERN Large Hadron Collider and corresponds to an integrated luminosity of 36.1 fb(-1). Data are analysed in the lepton+jets final state characterised by an isolated electron or muon with high transverse momentum large missing transverse momentum and multiple jets as well as the jets+E-T(miss) final state characterised by multiple jets and large missing transverse momentum. The search exploits the high multiplicity of jets identified as originating from b-quarks and the presence of boosted hadronically decaying top quarks and Higgs bosons reconstructed as large-radius jets characteristic of signal events. No significant excess above the Standard Model expectation is observed and 95% CL upper limits are set on the production cross sections for the different signal processes considered. These cross-section limits are used to derive lower limits on the mass of a vector-like T quark under several branching ratio hypotheses assuming contributions from T -> Wb Zt Ht decays. The 95% CL observed lower limits on the T quark mass range between 0.99TeV and 1.43TeV for all possible values of the branching ratios into the three decay modes considered significantly extending the reach beyond that of previous searches. Additionally upper limits on anomalous four-top-quark production are set in the context of an effective field theory model as well as in an universal extra dimensions model."
    Note
    Open access journal.
    ISSN
    1029-8479
    DOI
    10.1007/JHEP07(2018)089
    Version
    Final published version
    Sponsors
    ANPCyT, Argentina; YerPhI, Armenia; ARC, Australia; BMWFW, Austria; FWF, Austria; ANAS, Azerbaijan; SSTC, Belarus; CNPq, Brazil; FAPESP, Brazil; NSERC, Canada; NRC, Canada; CFI, Canada; CERN; CONICYT, Chile; CAS, China; MOST, China; NSFC, China; COLCIENCIAS, Colombia; MSMT CR, Czech Republic; MPO CR, Czech Republic; VSC CR, Czech Republic; DNRF, Denmark; DNSRC, Denmark; IN2P3-CNRS, France; CEA-DRF/IRFU, France; SRNSFG, Georgia; BMBF, Germany; HGF, Germany; MPG, Germany; GSRT, Greece; RGC, China; Hong Kong SAR, China; ISF, Israel; I-CORE, Israel; Benoziyo Center, Israel; INFN, Italy; MEXT, Japan; JSPS, Japan; CNRST, Morocco; NWO, Netherlands; RCN, Norway; MNiSW, Poland; NCN, Poland; FCT, Portugal; MNE/IFA, Romania; MES of Russia, Russian Federation; NRC KI, Russian Federation; JINR; MESTD, Serbia; MSSR, Slovakia; ARRS, Slovenia; MIZS, Slovenia; DST/NRF, South Africa; MINECO, Spain; SRC, Sweden; Wallenberg Foundation, Sweden; SERI, Switzerland; SNSF, Switzerland; Canton of Bern, Switzerland; MOST, Taiwan; TAEK, Turkey; STFC, United Kingdom; DOE, United States of America; NSF, United States of America; BCKDF, Canada; Canada Council, Canada; CANARIE, Canada; CRC, Canada; Compute Canada, Canada; FQRNT, Canada; Ontario Innovation Trust, Canada; EPLANET, European Union; ERC, European Union; ERDF, European Union; FP7, European Union; Horizon 2020, European Union; Marie Sklodowska-Curie Actions, European Union; Investissements d'Avenir Labex and Idex, France; ANR, France; Region Auvergne, France; Fondation Partager le Savoir, France; DFG, Germany; AvH Foundation, Germany; Herakleitos, Thales and Aristeia programmes - EU-ESF; Greek NSRF; BSF, Israel; GIF, Israel; Minerva, Israel; BRF, Norway; CERCA Programme Generalitat de Catalunya, Spain; Generalitat Valenciana, Spain; Royal Society, United Kingdom; Leverhulme Trust, United Kingdom; Canton of Geneva, Switzerland
    Additional Links
    http://link.springer.com/10.1007/JHEP07(2018)089
    ae974a485f413a2113503eed53cd6c53
    10.1007/JHEP07(2018)089
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