Scientific article
Open access

Search for New Phenomena in tt Events with Large Missing Transverse Momentum in Proton-Proton Collisions at √s=7  TeV with the ATLAS Detector

ContributorsATLAS Collaboration
Published inPhysical review letters, vol. 108, no. 04, 041805
Publication date2012

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.

Citation (ISO format)
ATLAS Collaboration. Search for New Phenomena in <em>tt</em> Events with Large Missing Transverse Momentum in Proton-Proton Collisions at √s=7  TeV with the ATLAS Detector. In: Physical review letters, 2012, vol. 108, n° 04, p. 041805. doi: 10.1103/PhysRevLett.108.041805
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Article (Published version)
ISSN of the journal0031-9007

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