| Authors | G. Aad, . et al, S. Bentvelsen, A.P. Colijn, A. Doxiadis, H. Garitaonandia, M. Gosselink, P. de Jong, M.S. Kayl, Z. van Kesteren, E. Koffeman, E. van der Kraaij, H.C. Lee, F. Linde, J. Mechnich, I. Mussche, L. de Nooij, J.P. Ottersbach, M. Tsiakiris, J.C. Vermeulen, M. Vreeswijk, I. van Vulpen, E. van der Poel, M. Rijpstra, N. Ruckstuhl | | Title | Search for new phenomena in tt- events with large missing transverse momentum in proton-proton collisions at sqrt s = 7 TeV with the ATLAS detector |
| Journal | Physical Review Letters |
| Volume | 108 |
| Year | 2012 |
| Issue | 4 |
| Pages | 041805- |
| ISSN | 00319007 |
| Faculty | Faculty of Science |
| Institute/dept. | FNWI: Institute for High Energy Physics (IHEF) |
| Abstract | 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-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. |
| Document type | Article |
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