Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/101689
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Type: Journal article
Title: Search for new phenomena in tt̅ events with large missing transverse momentum in proton-proton collisions at √s=7 TeV with the ATLAS detector
Other Titles: Search for new phenomena in tt -bar events with large missing transverse momentum in proton-proton collisions at root s=7 TeV with the ATLAS detector
Author: Aad, G.
ATLAS Collaboration
Citation: Physical Review Letters, 2012; 108(4):041805-1-041805-18
Publisher: American Physical Society
Issue Date: 2012
ISSN: 0031-9007
1079-7114
Statement of
Responsibility: 
G. Aad ... P. Jackson ... L. Lee ... A. Petridis ... N. Soni ... M. J. White ... et al. (ATLAS Collaboration)
Abstract: A search for new phenomena in tt⁻ events with large missing transverse momentum in proton-proton collisions at a center-of-mass energy of 7 TeV is presented. The measurement is based on 1:04 fb⁻¹ of data collected with the ATLAS detector at the LHC. Contributions to this final state may arise from a number of standard model extensions. The results are interpreted in terms of a model where new top-quark partners are pair produced and each decay to an on-shell top (or antitop) quark and a long-lived undetected neutral particle. The data are found to be consistent with standard model expectations. A limit at 95% confidence level is set excluding a cross section times branching ratio of 1.1 pb for a top-partner mass of 420 GeV and a neutral particle mass less than 10 GeV. In a model of exotic fourth generation quarks, top partner masses are excluded up to 420 GeV and neutral particle masses up to 140 GeV.
Keywords: ATLAS Collaboration; ATLAS Collaboration; ATLAS Collaboration
Rights: © 2012 CERN, for the ATLAS Collaboration. Published by the American Physical Society under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.
RMID: 0020132867
DOI: 10.1103/PhysRevLett.108.041805
Appears in Collections:Physics publications

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