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dc.contributor.authorAad, G.
dc.contributor.authorAguilar Saavedra, Juan Antonio 
dc.contributor.authorAtlas Collaboration
dc.identifier.citationAad, G., Abbott, B., Abdallah, J. et al. 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. J. High Energ. Phys. 2015, 105 (2015). []es_ES
dc.descriptionWe thank CERN for the very successful operation of the LHC, as well as the support staff from our institutions without whom ATLAS could not be operated efficiently. We acknowledge the support of ANPCyT, Argentina; YerPhI, Armenia; ARC, Australia; BMWFW and FWF, Austria; ANAS, Azerbaijan; SSTC, Belarus; CNPq and FAPESP, Brazil; NSERC, NRC and CFI, Canada; CERN; CONICYT, Chile; CAS, MOST and NSFC, China; COLCIENCIAS, Colombia; MSMT CR, MPO CR and VSC CR, Czech Republic; DNRF, DNSRC and Lundbeck Foundation, Denmark; EPLANET, ERC and NSRF, European Union; IN2P3-CNRS, CEA-DSM/IRFU, France; GNSF, Georgia; BMBF, DFG, HGF, MPG and AvH Foundation, Germany; GSRT and NSRF, Greece; RGC, Hong Kong SAR, China; ISF, MINERVA, GIF, I-CORE and Benoziyo Center, Israel; INFN, Italy; MEXT and JSPS, Japan; CNRST, Morocco; FOM and NWO, Netherlands; BRF and RCN, Norway; MNiSW and NCN, Poland; GRICES and FCT, Portugal; MNE/IFA, Romania; MES of Russia and NRC KI, Russian Federation; JINR; MSTD, Serbia; MSSR, Slovakia; ARRS and MIZS, Slovenia; DST/NRF, South Africa; MINECO, ˇ Spain; SRC and Wallenberg Foundation, Sweden; SER, SNSF and Cantons of Bern and Geneva, Switzerland; NSC, Taiwan; TAEK, Turkey; STFC, the Royal Society and Leverhulme Trust, United Kingdom; DOE and NSF, United States of America. The crucial computing support from all WLCG partners is acknowledged gratefully, in particular from CERN and the ATLAS Tier-1 facilities at TRIUMF (Canada), NDGF (Denmark, Norway, Sweden), CC-IN2P3 (France), KIT/GridKA (Germany), INFNCNAF (Italy), NL-T1 (Netherlands), PIC (Spain), ASGC (Taiwan), RAL (U.K.) and BNL (U.S.A.) and in the Tier-2 facilities worldwide.es_ES
dc.description.abstractA 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 s√=8 TeV recorded in 2012 with the ATLAS detector at the CERN Large Hadron Collider and corresponding to an integrated luminosity of 20.3 fb−1. 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 (TT¯¯¯¯→Wb+X), and both a T quark and a B quark with significant branching ratio to a Higgs boson and a third-generation quark (TT¯¯¯¯→Ht+XandBB¯¯¯¯→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.es_ES
dc.description.sponsorshipScience & Technology Facilities Council (STFC) ST/M000664/1 ST/L000970/1 ATLAS Upgrade ST/K001361/1 MINOS/MINOS+ ST/I000186/1 PP/E003087/1 1575161 ST/K001361/1 ATLAS ST/I006056/1 ATLAS Upgrade ST/J005525/1 ST/L000326/1 ST/M001504/1 ST/K001361/1 ATLAS Upgrades ST/K001361/1 LHCb Upgrades ST/I006056/1 ATLAS Upgrades ST/G50228X/1 PP/E000444/1 1201187 ST/K001310/1 ATLAS Upgrades ST/K001310/1 LHCb Upgrades ST/L000970/1 ATLAS Upgrades ST/L001209/1 ATLAS Upgrades ST/K00137X/1 ST/M003213/1 ST/L001179/1 ATLAS Upgrade ST/J501074/1 ST/I006080/1 ST/H001093/1 ST/G502320/1 ST/K001310/1 ATLAS ST/K000705/1 ST/M001733/1 ST/K003658/1 ST/K001396/1 ATLAS ST/J005576/1 1366364 ST/H00100X/1 ST/K001388/1 ST/K003658/1 GRIDPP ST/M001474/1 ST/N000463/1 ST/M002071/1 ATLAS Upgrades 1366825 1521422 ST/I000178/1 ST/M000761/1 GRIDPP PP/D002915/1 PP/E002846/1 ST/H001093/2 ST/L001195/1 ST/M002306/1 ATLAS Upgrades ST/M004821/1 GRIDPP ST/M006980/1 ATLAS Upgrades ST/H00100X/2 PP/E000347/1 1334588 1082012 ST/J004928/1 ATLAS Upgrade ST/M001407/1 ST/K001426/1 ATLAS ST/J00474X/1 ST/I005803/1 GRIDPP ST/K001418/1 ST/J004944/1 ST/K00140X/1 ST/L000970/1 ST/L003325/1 ST/L003112/1 ST/K001310/1 LHCb ST/I00372X/1 GRIDPP ST/J004928/1 ST/J00474X/1 ATLAS Upgrades ST/I00372X/1 ST/K001329/1 ST/L001179/1 ATLAS Upgrades ST/M007103/1 ATLAS Upgrades ST/J005487/1 ST/I006056/1 ST/L003414/1 ST/L006480/1 ST/M001431/1 ST/M002306/1 ST/M006980/1 ST/M503575/1 ST/K001310/1 PP/E000355/1 ST/I005803/1 ST/J004928/1 ATLAS Upgrades ST/K00073X/1 ST/K001264/1 ATLAS ST/K001302/1 ST/K001361/1 ATLAS ST/K001361/1 LHCb ST/K50208X/1 ST/L001144/1 ST/L00352X/1 ST/N000307/1 ST/L001179/1 ST/K001248/1 ST/M004821/1es_ES
dc.publisherSpringer Naturees_ES
dc.rightsAtribución 3.0 España*
dc.subjectHadron-Hadron scatteringes_ES
dc.titleSearch 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 detectores_ES

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Atribución 3.0 España
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