{"@context":"http://schema.org","@id":"https://doi.org/10.17182/hepdata.70548.v1","@reverse":{"isBasedOn":[{"@type":"ScholarlyArticle","identifier":{"@type":"PropertyValue","propertyID":"URL","value":"https://inspirehep.net/literature/1373299"}},{"@id":"https://doi.org/10.1007/JHEP08(2015)148","@type":"JournalArticle"}]},"@type":"Dataset","additionalType":"Collection","author":{"@type":"Organization","name":"ATLAS Collaboration"},"creator":{"@type":"Organization","name":"ATLAS Collaboration"},"datePublished":"2016","description":"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 $\\sqrt{s}= 8$ TeV. The lepton-plus-jets final state is used, where the top pair decays to $W^+bW^-\\bar{b}$, 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' 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' 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 $t\\bar{t}$. These range from 2.5 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.","hasPart":[{"@id":"https://doi.org/10.17182/hepdata.70548.v1/t1","@type":"Dataset","description":"Selection efficiency x Acceptance for a Z' resonance.","name":"Table 1"},{"@id":"https://doi.org/10.17182/hepdata.70548.v1/t2","@type":"Dataset","description":"Selection efficiency x Acceptance for a KK gluon resonance.","name":"Table 2"},{"@id":"https://doi.org/10.17182/hepdata.70548.v1/t3","@type":"Dataset","description":"Selection efficiency x Acceptance for a KK graviton resonance.","name":"Table 3"},{"@id":"https://doi.org/10.17182/hepdata.70548.v1/t4","@type":"Dataset","description":"Selection efficiency x Acceptance for a spin-0 resonance.","name":"Table 4"},{"@id":"https://doi.org/10.17182/hepdata.70548.v1/t5","@type":"Dataset","description":"Reconstructed m_tt spectrum for the boosted selections.","name":"Table 5"},{"@id":"https://doi.org/10.17182/hepdata.70548.v1/t6","@type":"Dataset","description":"Reconstructed m_tt spectrum for the resolved selections.","name":"Table 6"},{"@id":"https://doi.org/10.17182/hepdata.70548.v1/t7","@type":"Dataset","description":"Reconstructed m_tt spectrum for the all the selections.","name":"Table 7"},{"@id":"https://doi.org/10.17182/hepdata.70548.v1/t8","@type":"Dataset","description":"Limits on the production cross-section x branching ratio to tt final states as a function of the mass of Z'TC2.","name":"Table 8"},{"@id":"https://doi.org/10.17182/hepdata.70548.v1/t9","@type":"Dataset","description":"Limits on the production cross-section x branching ratio to tt final states as a function of the mass of bulk...","name":"Table 9"},{"@id":"https://doi.org/10.17182/hepdata.70548.v1/t10","@type":"Dataset","description":"Limits on the production cross-section x branching ratio to tt final states as a function of the mass of bulk...","name":"Table 10"},{"@id":"https://doi.org/10.17182/hepdata.70548.v1/t11","@type":"Dataset","description":"Limits on the production cross-section x branching ratio to tt final states as a function of the mass of a...","name":"Table 11"},{"@id":"https://doi.org/10.17182/hepdata.70548.v1/t12","@type":"Dataset","description":"Limits on the production cross-section x branching ratio to tt final states as a function of the width of a...","name":"Table 12"},{"@id":"https://doi.org/10.17182/hepdata.70548.v1/t13","@type":"Dataset","description":"Limits on the production cross-section x branching ratio to tt final states as a function of the width of a...","name":"Table 13"},{"@id":"https://doi.org/10.17182/hepdata.70548.v1/t14","@type":"Dataset","description":"Limits on the production cross-section x branching ratio to tt final states as a function of the width of a...","name":"Table 14"},{"@id":"https://doi.org/10.17182/hepdata.70548.v1/t15","@type":"Dataset","description":"Migration from the true mtt values to the reconstructed mtt values for the resolved selection.","name":"Table 15"},{"@id":"https://doi.org/10.17182/hepdata.70548.v1/t16","@type":"Dataset","description":"Migration from the true mtt values to the reconstructed mtt values for the boosted selection.","name":"Table 16"}],"identifier":[{"@type":"PropertyValue","propertyID":"HEPDataRecord","value":"https://www.hepdata.net/record/ins1373299?version=1"},{"@type":"PropertyValue","propertyID":"HEPDataRecordAlt","value":"https://www.hepdata.net/record/70548"}],"inLanguage":"en","name":"A search for $t\\bar{t}$ resonances using lepton-plus-jets events in proton-proton collisions at $\\sqrt{s} = 8$ TeV with the ATLAS detector","provider":{"@type":"Organization","name":"HEPData"},"publisher":{"@type":"Organization","name":"HEPData"},"url":"https://www.hepdata.net/record/ins1373299?version=1","version":1}