A search for $t\overline{t}$ resonances using lepton-plus-jets events in proton-proton collisions at $\sqrt{s}=8$ TeV with the ATLAS detector

Aad, G.

doi:10.1007/JHEP08(2015)148

Title: A search for $$t\overline{t}$$ resonances using lepton-plus-jets events in proton-proton collisions at $$\sqrt{s}=8$$ TeV with the ATLAS detector

Journal Article · Fri Aug 28 00:00:00 EDT 2015 · Journal of High Energy Physics (Online)

DOI:https://doi.org/10.1007/JHEP08(2015)148· OSTI ID:1223311

Aad, G. ^[1]

Aix-Marseille Univ. and CNRS/IN2P3, Marseille (France). et al.

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}^{+}b{W}^{-}\overline{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 Γ/m = 15% decaying to $ t\overline{t} $. 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.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Argonne National Laboratory (ANL), Argonne, IL (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Contributing Organization:: The ATLAS collaboration; ATLAS Collaboration

Grant/Contract Number:: AC03-76SF00515; AC02-98CH10886; AC02-76CH00016; SC0012704; AC03-76SF00098; AC02-05CH11231; AC02-06CH11357; SC00112704

OSTI ID:: 1223311

Alternate ID(s):: OSTI ID: 1222756; OSTI ID: 1222766; OSTI ID: 1223310; OSTI ID: 1407382

Journal Information:: Journal of High Energy Physics (Online), Vol. 2015, Issue 8; ISSN 1029-8479

Publisher:: Springer BerlinCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 120 works

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