This Letter presents measurements of the polarization of the top quark in top-antitop quark pair events, using 4.7 fb-1 of proton-proton collision data recorded with the ATLAS detector at the Large Hadron Collider at √s=7 TeV. Final states containing one or two isolated leptons (electrons or muons) and jets are considered. Two measurements of αℓP, the product of the leptonic spin-analyzing power and the top quark polarization, are performed assuming that the polarization is introduced by either a CP conserving or a maximally CP violating production process. The measurements obtained, αℓPCPC=-0.035±0. 014(stat)±0.037(syst) and αℓPCPV=0. 020±0.016(stat)-0.017+0.013(syst), are in good agreement with the standard model prediction of negligible top quark polarization. © 2013 CERN. Published by the American Physical Society under the terms of the http://creativecommons.org/licenses/by/3.0/ Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.
|Titolo:||Measurement of top quark polarization in top-antitop events from proton-proton collisions at √s=7 TeV using the ATLAS detector|
|Autori interni:||ROSSI, Elvira|
CONVENTI, Francesco Alessandro
DI DONATO, CAMILLA
|Data di pubblicazione:||2013|
|Rivista:||PHYSICAL REVIEW LETTERS|
|Appare nelle tipologie:||1.1 Articolo in rivista|