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Measurement of Spin Correlations in ttbar production

We present a measurement of the top spin correlation in $t\bar{t}$ production in the dilepton channels in pp collisions at $\sqrt{s}=$7 TeV. The data sample used for the measurement corresponds to an integrated luminosity of 5.0$\pm$0.1 fb$^{-1}$ collected with the CMS detector at the LHC. The measu...

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Autor principal: CMS Collaboration
Publicado: 2012
Materias:
Acceso en línea:http://cds.cern.ch/record/1461788
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author CMS Collaboration
author_facet CMS Collaboration
author_sort CMS Collaboration
collection CERN
description We present a measurement of the top spin correlation in $t\bar{t}$ production in the dilepton channels in pp collisions at $\sqrt{s}=$7 TeV. The data sample used for the measurement corresponds to an integrated luminosity of 5.0$\pm$0.1 fb$^{-1}$ collected with the CMS detector at the LHC. The measurement is performed in events with two leptons (electrons or muons) in the final state, and at least two jets where at least one is identified as originating from a b-quark. In addition the presence of missing transverse energy is required. The spin correlation in $t\bar{t}$ events is extracted from a fit to the angular distribution between the two selected leptons. In the helicity basis, the correlation coefficient is found to be 0.24$\pm$0.02(stat.)$\pm$0.08(syst.). The spin correlation is also investigated through other variables and for different \ttbar\ invariant masses. All measurements are found to be in agreement with the standard model predictions.
id cern-1461788
institution Organización Europea para la Investigación Nuclear
publishDate 2012
record_format invenio
spelling cern-14617882019-09-30T06:29:59Zhttp://cds.cern.ch/record/1461788CMS CollaborationMeasurement of Spin Correlations in ttbar productionParticle Physics - ExperimentWe present a measurement of the top spin correlation in $t\bar{t}$ production in the dilepton channels in pp collisions at $\sqrt{s}=$7 TeV. The data sample used for the measurement corresponds to an integrated luminosity of 5.0$\pm$0.1 fb$^{-1}$ collected with the CMS detector at the LHC. The measurement is performed in events with two leptons (electrons or muons) in the final state, and at least two jets where at least one is identified as originating from a b-quark. In addition the presence of missing transverse energy is required. The spin correlation in $t\bar{t}$ events is extracted from a fit to the angular distribution between the two selected leptons. In the helicity basis, the correlation coefficient is found to be 0.24$\pm$0.02(stat.)$\pm$0.08(syst.). The spin correlation is also investigated through other variables and for different \ttbar\ invariant masses. All measurements are found to be in agreement with the standard model predictions.CMS-PAS-TOP-12-004oai:cds.cern.ch:14617882012
spellingShingle Particle Physics - Experiment
CMS Collaboration
Measurement of Spin Correlations in ttbar production
title Measurement of Spin Correlations in ttbar production
title_full Measurement of Spin Correlations in ttbar production
title_fullStr Measurement of Spin Correlations in ttbar production
title_full_unstemmed Measurement of Spin Correlations in ttbar production
title_short Measurement of Spin Correlations in ttbar production
title_sort measurement of spin correlations in ttbar production
topic Particle Physics - Experiment
url http://cds.cern.ch/record/1461788
work_keys_str_mv AT cmscollaboration measurementofspincorrelationsinttbarproduction