Observation of spin correlation in tt̄ events from pp collisions at √s = 7 TeV Using the ATLAS detector

A measurement of spin correlation in tt̄ production is reported using data collected with the ATLAS detector at the LHC, corresponding to an integrated luminosity of 2.1 fb⁻¹. Candidate events are selected in the dilepton topology with large missing transverse energy and at least two jets. The diffe...

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Autores principales: Anduaga, Xabier Sebastián, Dova, María Teresa, Monticelli, Fernando Gabriel, Tripiana, Martín Fernando, The ATLAS Collaboration
Formato: Articulo
Lenguaje:Inglés
Publicado: 2012
Materias:
Ciencias Exactas
Física
Top quarks
Experimental tests
Inclusive production with identified leptons, photons, or other nonhadronic particles
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/131228
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-131228
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
Top quarks
Experimental tests
Inclusive production with identified leptons, photons, or other nonhadronic particles
spellingShingle Ciencias Exactas
Física
Top quarks
Experimental tests
Inclusive production with identified leptons, photons, or other nonhadronic particles
Anduaga, Xabier Sebastián
Dova, María Teresa
Monticelli, Fernando Gabriel
Tripiana, Martín Fernando
The ATLAS Collaboration
Observation of spin correlation in tt̄ events from pp collisions at √s = 7 TeV Using the ATLAS detector
topic_facet Ciencias Exactas
Física
Top quarks
Experimental tests
Inclusive production with identified leptons, photons, or other nonhadronic particles
description A measurement of spin correlation in tt̄ production is reported using data collected with the ATLAS detector at the LHC, corresponding to an integrated luminosity of 2.1 fb⁻¹. Candidate events are selected in the dilepton topology with large missing transverse energy and at least two jets. The difference in azimuthal angle between the two charged leptons in the laboratory frame is used to extract the correlation between the top and antitop quark spins. In the helicity basis the measured degree of correlation corresponds to A<sub>helicity</sub> = 0.40<sup>+0:09</sup><sub>-0.08</sub>, in agreement with the next-to-leading-order standard model prediction. The hypothesis of zero spin correlation is excluded at 5.1 standard deviations.
format Articulo
Articulo
author Anduaga, Xabier Sebastián
Dova, María Teresa
Monticelli, Fernando Gabriel
Tripiana, Martín Fernando
The ATLAS Collaboration
author_facet Anduaga, Xabier Sebastián
Dova, María Teresa
Monticelli, Fernando Gabriel
Tripiana, Martín Fernando
The ATLAS Collaboration
author_sort Anduaga, Xabier Sebastián
title Observation of spin correlation in tt̄ events from pp collisions at √s = 7 TeV Using the ATLAS detector
title_short Observation of spin correlation in tt̄ events from pp collisions at √s = 7 TeV Using the ATLAS detector
title_full Observation of spin correlation in tt̄ events from pp collisions at √s = 7 TeV Using the ATLAS detector
title_fullStr Observation of spin correlation in tt̄ events from pp collisions at √s = 7 TeV Using the ATLAS detector
title_full_unstemmed Observation of spin correlation in tt̄ events from pp collisions at √s = 7 TeV Using the ATLAS detector
title_sort observation of spin correlation in tt̄ events from pp collisions at √s = 7 tev using the atlas detector
publishDate 2012
url http://sedici.unlp.edu.ar/handle/10915/131228
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