Measurement of top quark polarization in top-antitop events from proton-proton collisions at √s = 7 TeV using the ATLAS detector

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 muon...

Descripción completa

Guardado en:
Detalles Bibliográficos
Autor principal: Aad, G.
Formato: JOUR
Materias:
Polarization
Tellurium compounds
ATLAS detectors
Final state
Large Hadron Collider
Measurements of
Production process
Proton proton collisions
The standard model
Top quarks
Elementary particles
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00319007_v111_n23_p_Aad
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
Descripción
Sumario: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 α ℓ P, 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, α ℓ P CPC =–0.035 ± 0.014(stat) ± 0:037(syst) and α ℓ P CPV = 0.020 ± 0:016(stat) +0.013 –0.017 (syst), are in good agreement with the standard model prediction of negligible top quark polarization. © 2013 CERN, for the ATLAS Collaboration.

Ejemplares similares