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<SUP>-1</SUP> 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 lept...
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| Autores principales: | , , , , , , |
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| Formato: | Articulo |
| Lenguaje: | Inglés |
| Publicado: |
2013
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| Materias: | |
| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/85423 |
| Aporte de: |
| Sumario: | This Letter presents measurements of the polarization of the top quark in top-antitop quark pair events, using 4:7 fb<SUP>-1</SUP> 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<SUB>ℓ</SUB>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<SUB>ℓ</SUB>P<SUB>CPC</SUB>=–0.035 ± 0.014(stat) ± 0.037(syst) and α<SUB>ℓ</SUB>P<SUB>CPV</SUB>= 0.020 ± 0.016(stat)<SUP>+0.013</SUP> <SUB>-0.017</SUB>(syst), are in good agreement with the standard model prediction of negligible top quark polarization. |
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