@Article{ATLASCollaborationAad_etal2015,
author="ATLAS Collaboration (Aad, G. et al
and Alvarez Piqueras, D.
and Cabrera Urban, S.
and Castillo Gimenez, V.
and Costa, M. J.
and Fernandez Martinez, P.
and Ferrer, A.
and Fiorini, L.
and Fuster, J.
and Garcia, C.
and Garcia Navarro, J. E.
and Gonzalez de la Hoz, S.
and Hernandez Jimenez, Y.
and Higon-Rodriguez, E.
and Irles Quiles, A.
and Jimenez Pena, J.
and Kaci, M.
and King, M.
and Lacasta, C.
and Lacuesta, V. R.
and Marti-Garcia, S.
and Mitsou, V. A.
and Moles-Valls, R.
and Oliver Garcia, E.
and Pedraza Lopez, S.
and Perez Garcia-Esta{\~A}{\textpm}, M. T.
and Romero Adam, E.
and Ros, E.
and Salt, J.
and Sanchez Martinez, V.
and Soldevila, U.
and Sanchez, J.
and Torro Pastor, E.
and Valero, A.
and Valladolid Gallego, E.
and Valls Ferrer, J. A.
and Vos, M.",
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 root 8=8 TeV with the ATLAS detector",
journal="Journal of High Energy Physics",
year="2015",
publisher="Springer",
volume="08",
number="8",
pages="105--86pp",
optkeywords="Hadron-Hadron Scattering",
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 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 , and both a T quark and a B quark with significant branching ratio to a Higgs boson and a third-generation quark ( 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.",
optnote="WOS:000360408100001",
optnote="exported from refbase (https://references.ific.uv.es/refbase/show.php?record=2378), last updated on Thu, 24 Sep 2015 11:21:35 +0000",
issn="1029-8479",
doi="10.1007/JHEP08(2015)105",
opturl="http://arxiv.org/abs/1505.04306",
opturl="https://doi.org/10.1007/JHEP08(2015)105",
archivePrefix="arXiv",
eprint="1505.04306",
language="English"
}