@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="A search for t(t)over-bar resonances using lepton-plus-jets events in proton-proton collisions at root s=8 TeV with the ATLAS detector",
journal="Journal of High Energy Physics",
year="2015",
publisher="Springer",
volume="08",
number="8",
pages="148--54pp",
optkeywords="Exotics; Hadron-Hadron Scattering; Top physics",
abstract="A search for new particles that decay into top quark pairs is reported. The search is performed with the ATLAS experiment at the LHC using an integrated luminosity of 20.3 fb(-1) of proton-proton collision data collected at a centre-of-mass energy of root s = 8TeV. The lepton-plus-jets final state is used, where the top pair decays to W (+) bW(-)(b) over bar, with one W boson decaying leptonically and the other hadronically. The invariant mass spectrum of top quark pairs is examined for local excesses or deficits that are inconsistent with the Standard Model predictions. No evidence for a top quark pair resonance is found, and 95{\%} confidence-level limits on the production rate are determined for massive states in benchmark models. The upper limits on the cross-section times branching ratio of a narrow Z{\textquoteright} boson decaying to top pairs range from 4.2 pb to 0.03 pb for resonance masses from 0.4 TeV to 3.0 TeV. A narrow leptophobic topcolour Z{\textquoteright} boson with mass below 1.8 TeV is excluded. Upper limits are set on the cross-section times branching ratio for a broad colour-octet resonance with Gamma/m = 15{\%} decaying to tt. These range from 4.8 pb to 0.03 pb for masses from 0.4 TeV to 3.0 TeV. A Kaluza-Klein excitation of the gluon in a Randall-Sundrum model is excluded for masses below 2.2 TeV.",
optnote="WOS:000363532500006",
optnote="exported from refbase (https://references.ific.uv.es/refbase/show.php?record=2438), last updated on Thu, 19 Nov 2015 14:04:33 +0000",
issn="1029-8479",
doi="10.1007/JHEP08(2015)148",
opturl="http://arxiv.org/abs/1505.07018",
opturl="https://doi.org/10.1007/JHEP08(2015)148",
archivePrefix="arXiv",
eprint="1505.07018",
language="English"
}