TY - JOUR
T1 - Measurement of Top Quark Polarization in Top-Antitop Events from Proton- Proton Collisions at root s=7 TeV Using the ATLAS Detector
AU - Aad, G.
AU - Abajyan, T.
AU - Abbott, B.
AU - Abdallah, J.
AU - Khalek, S.A.
AU - Dam, Mogens
AU - Hansen, Jørgen Beck
AU - Hansen, Peter Henrik
AU - Hansen, John Renner
AU - Hansen, Jørn Dines
AU - Heisterkamp, Simon Johann Franz
AU - Jørgensen, Morten Dam
AU - Boelaert, Nele Maria Philomena
AU - Klinkby, Esben Bryndt
AU - Løvschall-Jensen, Ask Emil
AU - Mehlhase, Sascha
AU - Nilsson, Björn Stefan
AU - Petersen, Troels Christian
AU - Xella, Stefania
PY - 2013/12/4
Y1 - 2013/12/4
N2 - 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 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)+0.013 –0.017(syst), are in good agreement with the standard model prediction of negligible top quark polarization.
AB - 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 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)+0.013 –0.017(syst), are in good agreement with the standard model prediction of negligible top quark polarization.
U2 - 10.1103/PhysRevLett.111.232002
DO - 10.1103/PhysRevLett.111.232002
M3 - Journal article
C2 - 24476258
SN - 0031-9007
VL - 111
JO - Physical Review Letters
JF - Physical Review Letters
IS - 23
M1 - 232002
ER -