Measurement of Top Quark Polarization in Top-Antitop Events from Proton- Proton Collisions at root s=7 TeV Using the ATLAS Detector

G. Aad, T. Abajyan, B. Abbott, J. Abdallah, S.A. Khalek, Mogens Dam, Jørgen Beck Hansen, Peter Henrik Hansen, John Renner Hansen, Jørn Dines Hansen, Simon Johann Franz Heisterkamp, Morten Dam Jørgensen, Nele Maria Philomena Boelaert, Esben Bryndt Klinkby, Ask Emil Løvschall-Jensen, Sascha Mehlhase, Björn Stefan Nilsson, Troels Christian Petersen, Stefania Xella

39 Citationer (Scopus)

Abstract

This Letter presents measurements of the polarization of the top quark in top-antitop quark pair events, using 4:7 fb–1of 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 αP, 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, αPCPC=–0.035 ± 0.014(stat) ± 0:037(syst) and αPCPV= 0.020 ± 0:016(stat)+0.013 –0.017(syst), are in good agreement with the standard model prediction of negligible top quark polarization.

OriginalsprogEngelsk
Artikelnummer232002
TidsskriftPhysical Review Letters
Vol/bind111
Udgave nummer23
ISSN0031-9007
DOI
StatusUdgivet - 4 dec. 2013

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