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01621 am a22001813u 4500 |
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|a dc
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|a Taylor, Frank E.
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|a Massachusetts Institute of Technology. Department of Physics
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|a Taylor, Frank E.
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|a Taylor, Frank E.
|e contributor
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|a Search for New Phenomena in tt̅ Events with Large Missing Transverse Momentum in Proton-Proton Collisions at √s=7 TeV with the ATLAS Detector
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|b American Physical Society,
|c 2012-07-06T13:49:17Z.
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|z Get fulltext
|u http://hdl.handle.net/1721.1/71542
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|a A search for new phenomena in tt̅ 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[superscript -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.
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|a en_US
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|a Article
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|t Physical Review Letters
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