Search for $t\bar t$ resonances in the lepton plus jets final state with ATLAS using 4.7 fb$^{-1}$ of $pp$ collisions at $\sqrt{s} = 7$ TeV - INSPIRE

DataBETA

Search for $t\bar t$ resonances in the lepton plus jets final state with ATLAS using 4.7 fb $^{-1}$ of $pp$ collisions at $\sqrt{s} = 7$ TeV

ATLAS

Collaboration

May 13, 2013

28 pages

Published in:

Phys.Rev.D 88 (2013) 1, 012004

Published: Jul 23, 2013

e-Print:

1305.2756 [hep-ex]

DOI:

10.1103/PhysRevD.88.012004

PDG: Limits for other

{{\mathit Z}^{\,'}}

Report number:

CERN-PH-EP-2013-032

Experiments:

CERN-LHC-ATLAS

View in:

reference search113 citations

Citations per year

Abstract: (APS)

A search for new particles that decay into top quark pairs (tt¯) is performed with the ATLAS experiment at the LHC using an integrated luminosity of 4.7 fb-1 of proton–proton (pp) collision data collected at a center-of-mass energy s=7 TeV. In the tt¯→WbWb decay, the lepton plus jets final state is used, where one W boson decays leptonically and the other hadronically. The tt¯ system is reconstructed using both small-radius and large-radius jets, the latter being supplemented by a jet substructure analysis. A search for local excesses in the number of data events compared to the Standard Model expectation in the tt¯ invariant mass spectrum is performed. No evidence for a tt¯ resonance is found and 95% credibility-level limits on the production rate are determined for massive states predicted in two benchmark models. The upper limits on the cross section times branching ratio of a narrow Z′ resonance range from 5.1 pb for a boson mass of 0.5 TeV to 0.03 pb for a mass of 3 TeV. A narrow leptophobic topcolor Z′ resonance with a mass below 1.74 TeV is excluded. Limits are also derived for a broad color-octet resonance with Γ/m=15.3%. A Kaluza–Klein excitation of the gluon in a Randall–Sundrum model is excluded for masses below 2.07 TeV.

Note:

16 pages plus author list (29 pages total), 11 figures, 5 tables, submitted to Physical Review D, All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/TOPQ-2012-14/

14.80.Rt
14.65.Ha
12.60.Cn
13.85.Rm
top: pair production
gluon: Kaluza-Klein
p p: scattering
shape analysis: jet
ATLAS
Randall-Sundrum model

References(92)

Figures(25)

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