Search for resonant top plus jet production in $t\bar{t}$ + jets events with the ATLAS detector in $pp$ collisions at $\sqrt{s}=7$ TeV

This paper presents a search for a new heavy particle produced in association with a top or antitop quark. Two models in which the new heavy particle is a color singlet or a color triplet are considered, decaying respectively to tbarq or tq, leading to a resonance within the ttbar + jets signature. The full 2011 ATLAS pp collision dataset from the LHC (4.7 fb-1) is used to search for ttbar events produced in association with jets, in which one of the W bosons from the top quarks decays leptonically and the other decays hadronically. The data are consistent with the Standard Model expectation, and a new particle with mass below 430 GeV for both W boson and color triplet models is excluded at 95% confidence level, assuming unit right-handed coupling.

Note:

7 pages plus author list (20 pages total), 6 figures, 2 tables, submitted to Physical Review D Rapid Communications

14.80.-j
top: pair production
postulated particle: heavy
p p: scattering
jet: associated production
color: singlet
ATLAS
new particle
color: triplet
mass: lower limit

References(46)

Figures(12)

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There are several differences between the models in Refs. [3] and [4]. The Lagrangian in the former (used in this paper) includes a factor of 1/ 2, and the one in the latter (used by CMS) does not. In