Schwanenberger, C. (2012) t¯t spin correlation at the LHC. Il nuovo cimento C, 35 (3). pp. 115-118. ISSN 1826-9885
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Abstract
The ATLAS collaboration has performed a study of spin correlation in t¯t production from proton-proton collisions at the Large Hadron Collier (LHC) at a centre-of-mass energy of 7TeV 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.
| Item Type: | Article |
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| Uncontrolled Keywords: | Top quarks ; Quantum chromodynamics - Experimental tests ; Inclusive production with identified leptons, photons, or other nonhadronic particles |
| Subjects: | 500 Scienze naturali e Matematica > 530 Fisica |
| Depositing User: | Marina Spanti |
| Date Deposited: | 19 Apr 2020 15:31 |
| Last Modified: | 19 Apr 2020 15:31 |
| URI: | http://eprints.bice.rm.cnr.it/id/eprint/17838 |
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