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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Detalles Bibliográficos
Autores principales: Alconada Verzini, María Josefina, Alonso, Francisco, Anduaga, Xabier Sebastián, Dova, María Teresa, Monticelli, Fernando Gabriel, Tripiana, Martín Fernando, The ATLAS Collaboration
Formato: Articulo
Lenguaje:Inglés
Publicado: 2013
Materias:
Ciencias Exactas
Física
Proton-Proton Collisions
ATLAS Detector
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/85423
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-85423
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Exactas
Física
Proton-Proton Collisions
ATLAS Detector
spellingShingle Ciencias Exactas
Física
Proton-Proton Collisions
ATLAS Detector
Alconada Verzini, María Josefina
Alonso, Francisco
Anduaga, Xabier Sebastián
Dova, María Teresa
Monticelli, Fernando Gabriel
Tripiana, Martín Fernando
The ATLAS Collaboration
Measurement of top quark polarization in top-antitop events from proton-proton collisions at √s = 7 TeV using the ATLAS detector
topic_facet Ciencias Exactas
Física
Proton-Proton Collisions
ATLAS Detector
description 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.
format Articulo
Articulo
author Alconada Verzini, María Josefina
Alonso, Francisco
Anduaga, Xabier Sebastián
Dova, María Teresa
Monticelli, Fernando Gabriel
Tripiana, Martín Fernando
The ATLAS Collaboration
author_facet Alconada Verzini, María Josefina
Alonso, Francisco
Anduaga, Xabier Sebastián
Dova, María Teresa
Monticelli, Fernando Gabriel
Tripiana, Martín Fernando
The ATLAS Collaboration
author_sort Alconada Verzini, María Josefina
title Measurement of top quark polarization in top-antitop events from proton-proton collisions at √s = 7 TeV using the ATLAS detector
title_short Measurement of top quark polarization in top-antitop events from proton-proton collisions at √s = 7 TeV using the ATLAS detector
title_full Measurement of top quark polarization in top-antitop events from proton-proton collisions at √s = 7 TeV using the ATLAS detector
title_fullStr Measurement of top quark polarization in top-antitop events from proton-proton collisions at √s = 7 TeV using the ATLAS detector
title_full_unstemmed Measurement of top quark polarization in top-antitop events from proton-proton collisions at √s = 7 TeV using the ATLAS detector
title_sort measurement of top quark polarization in top-antitop events from proton-proton collisions at √s = 7 tev using the atlas detector
publishDate 2013
url http://sedici.unlp.edu.ar/handle/10915/85423
work_keys_str_mv AT alconadaverzinimariajosefina measurementoftopquarkpolarizationintopantitopeventsfromprotonprotoncollisionsats7tevusingtheatlasdetector
AT alonsofrancisco measurementoftopquarkpolarizationintopantitopeventsfromprotonprotoncollisionsats7tevusingtheatlasdetector
AT anduagaxabiersebastian measurementoftopquarkpolarizationintopantitopeventsfromprotonprotoncollisionsats7tevusingtheatlasdetector
AT dovamariateresa measurementoftopquarkpolarizationintopantitopeventsfromprotonprotoncollisionsats7tevusingtheatlasdetector
AT monticellifernandogabriel measurementoftopquarkpolarizationintopantitopeventsfromprotonprotoncollisionsats7tevusingtheatlasdetector
AT tripianamartinfernando measurementoftopquarkpolarizationintopantitopeventsfromprotonprotoncollisionsats7tevusingtheatlasdetector
AT theatlascollaboration measurementoftopquarkpolarizationintopantitopeventsfromprotonprotoncollisionsats7tevusingtheatlasdetector
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