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Type: Journal article
Title: Search for same-sign top-quark production and fourth-generation down-type quarks in pp collisions at √s=7TeV with the ATLAS detector
Other Titles: Search for same-sign top-quark production and fourth-generation down-type quarks in pp collisions at root s=7TeV with the ATLAS detector
Author: ATLAS Collaboration
Aad, G.
White, M.
Citation: Journal of High Energy Physics, 2012; 2012(4):69-1-69-39
Publisher: Springer
Issue Date: 2012
ISSN: 1126-6708
Statement of
G. Aad … P. Jackson … L. Lee … A. Petridis … N. Soni ... M. White ... et al. (The ATLAS Collaboration)
Abstract: A search is presented for same-sign top-quark production and down-type heavy quarks of charge −1/3 in events with two isolated leptons (e or μ) that have the same electric charge, at least two jets and large missing transverse momentum. The data are selected from pp collisions at s√=7TeV recorded by the ATLAS detector and correspond to an integrated luminosity of 1.04 fb−1. The observed data are consistent with expectations from Standard Model processes. Upper limits are set at 95 % confidence level on the cross section of new sources of same-sign top-quark pair production of 1.4-2.0 pb depending on the assumed mediator mass. Upper limits are also set on the pair-production cross-section for new heavy down-type quarks; a lower limit of 450 GeV is set at 95 % confidence level on the mass of heavy down-type quarks under the assumption that they decay 100 % of the time to W t.
Keywords: Hadron-Hadron scattering
Rights: Copyright CERN. Open Access. This article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.
RMID: 0020132701
DOI: 10.1007/JHEP04(2012)069
Appears in Collections:Physics publications

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