Tt̄ spin correlation at the LHC

C. Schwanenberger

    Research output: Contribution to journalArticlepeer-review


    The ATLAS collaboration has performed a study of spin correlation in tt̄ production from proton-proton collisions at the Large Hadron Collier (LHC) at a centre-of-mass energy of 7 TeV using 0.70 fb-1 of data. 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 is compared to the expected distributions in the Standard Model, and to the case where the top quarks are produced with uncorrelated spin. Using the helicity basis as the quantisation axis, the strength of the spin correlation between the top and antitop quark is measured to be Ahelicity = 0.34+0.15-0.11, which is in agreement with the NLO Standard Model prediction. © CERN on behalf of the ATLAS Collaboration under CC BY-NC 3.0.
    Original languageEnglish
    Pages (from-to)115-118
    Number of pages3
    JournalNuovo Cimento della Societa Italiana di Fisica C
    Issue number3
    Publication statusPublished - May 2012


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