| Authors | G. Aad, . et al, S. Bentvelsen, A.P. Colijn, A. Doxiadis, H. Garitaonandia, D.A.A. Geerts, M. Gosselink, P. de Jong, M.S. Kayl, Z. van Kesteren, E. Koffeman, E. van der Kraaij, H.C. Lee, R.H.L. van der Leeuw, 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 | Observation of spin correlation in tt- events from pp collisions at sqrt s = 7 TeV using the ATLAS detector |
| Journal | Physical Review Letters |
| Volume | 108 |
| Year | 2012 |
| Pages | 212001- |
| ISSN | 00319007 |
| Faculty | Faculty of Science |
| Institute/dept. | FNWI: Institute for High Energy Physics (IHEF) |
| Abstract | A measurement of spin correlation in tt̅ production is reported using data collected with the ATLAS detector at the LHC, corresponding to an integrated luminosity of 2.1 fb-1. Candidate events are selected in the dilepton topology with large missing transverse energy and at least two jets. The difference in azimuthal angle between the two charged leptons in the laboratory frame is used to extract the correlation between the top and antitop quark spins. In the helicity basis the measured degree of correlation corresponds to Ahelicity=0.40-0.08+0.09, in agreement with the next-to-leading-order standard model prediction. The hypothesis of zero spin correlation is excluded at 5.1 standard deviations. |
| Document type | Article |
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