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AuthorsG. 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
TitleObservation of spin correlation in tt- events from pp collisions at sqrt s = 7 TeV using the ATLAS detector
JournalPhysical Review Letters
Volume108
Year2012
Pages212001-
ISSN00319007
FacultyFaculty of Science
Institute/dept.FNWI: Institute for High Energy Physics (IHEF)
AbstractA 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 typeArticle
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