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- Measurements of spin correlation in top-antitop quark events from proton-proton collisions at $\sqrt{s}=7$ TeV using the ATLAS detector doi link

Auteur(s): Aad G., Albrand S., Brown J., Collot J., Crépé-Renaudin S., Dechenaux B., Delsart P.A., Gabaldon C., Genest M.H., Hostachy J.Y., Le B.T., Ledroit-Guillon F., Lleres A., Lucotte A., Malek F., Monini C., Stark J., Trocmé B., Wu M., Rahal G., Abdel Khalek S., Bassalat A., Becot C., Binet S., Bourdarios C., Charfeddine D., De Vivie De Regie J.B., Duflot L., Escalier M., Ughetto M.

(Article) Publié: Physical Review D, vol. 90 p.112016 (2014)
Texte intégral en Openaccess : arXiv


Ref Arxiv: 1407.4314
DOI: 10.1103/PhysRevD.90.112016
WoS: 000348871500004
Ref. & Cit.: NASA ADS
37 Citations
Résumé:

Measurements of spin correlation in top quark pair production are presented using data collected with the ATLAS detector at the LHC with proton-proton collisions at a center-of-mass energy of 7 TeV, corresponding to an integrated luminosity of 4.6 fb$^{-1}$. Events are selected in final states with two charged leptons and at least two jets and in final states with one charged lepton and at least four jets. Four different observables sensitive to different properties of the top quark pair production mechanism are used to extract the correlation between the top and antitop quark spins. Some of these observables are measured for the first time. The measurements are in good agreement with the Standard Model prediction at next-to-leading-order accuracy.



Commentaires: See paper for full list of authors - 20 pages plus author list + cover pages (33 pages total), 10 figures, 6 tables, submitted to Phys. Rev. D, All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/TOPQ-2013-01/