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Measurement of top quark pair production in association with a W or Z boson using event reconstruction techniques
A measurement of top quark pair production in association with a W or Z boson is presented, using 8 TeV proton-proton collision data corresponding to an integrated luminosity of 19.5 fb$^{-1}$, collected by the CMS experiment at the LHC. Final states are selected in which the associated W boson deca...
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Publicado: |
2015
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Acceso en línea: | http://cds.cern.ch/record/2037139 |
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author | CMS Collaboration |
author_facet | CMS Collaboration |
author_sort | CMS Collaboration |
collection | CERN |
description | A measurement of top quark pair production in association with a W or Z boson is
presented, using 8 TeV proton-proton collision data corresponding to an integrated
luminosity of 19.5 fb$^{-1}$, collected by the CMS experiment at the LHC. Final
states are selected in which the associated W boson decays to a charged lepton and
a neutrino ($W \rightarrow \ell\nu$) or the Z boson decays to two charged leptons
($Z \rightarrow \ell\ell$), where $\ell$ refers to an electron or muon.
The $\mathrm{t}\bar{\mathrm{t}}\mathrm{W}$ cross section is measured to be
$\sigma(\mathrm{t}\bar{\mathrm{t}}\mathrm{W}) = 382^{+117}_{-102}$ fb with a significance of 4.8
standard deviations from the background-only hypothesis. The
$\mathrm{t}\bar{\mathrm{t}}\mathrm{Z}$ cross section is measured to be
$\sigma(\mathrm{t}\bar{\mathrm{t}}\mathrm{Z}) = 242^{+65}_{-55}$ fb with a
significance of 6.4 standard deviations from the background-only hypothesis.
These measurements are used to find bounds for five anomalous dimension-six operators
which would affect the $\mathrm{t}\bar{\mathrm{t}}\mathrm{W}$ and
$\mathrm{t}\bar{\mathrm{t}}\mathrm{Z}$ cross sections. |
id | cern-2037139 |
institution | Organización Europea para la Investigación Nuclear |
publishDate | 2015 |
record_format | invenio |
spelling | cern-20371392019-09-30T06:29:59Zhttp://cds.cern.ch/record/2037139CMS CollaborationMeasurement of top quark pair production in association with a W or Z boson using event reconstruction techniquesParticle Physics - ExperimentA measurement of top quark pair production in association with a W or Z boson is presented, using 8 TeV proton-proton collision data corresponding to an integrated luminosity of 19.5 fb$^{-1}$, collected by the CMS experiment at the LHC. Final states are selected in which the associated W boson decays to a charged lepton and a neutrino ($W \rightarrow \ell\nu$) or the Z boson decays to two charged leptons ($Z \rightarrow \ell\ell$), where $\ell$ refers to an electron or muon. The $\mathrm{t}\bar{\mathrm{t}}\mathrm{W}$ cross section is measured to be $\sigma(\mathrm{t}\bar{\mathrm{t}}\mathrm{W}) = 382^{+117}_{-102}$ fb with a significance of 4.8 standard deviations from the background-only hypothesis. The $\mathrm{t}\bar{\mathrm{t}}\mathrm{Z}$ cross section is measured to be $\sigma(\mathrm{t}\bar{\mathrm{t}}\mathrm{Z}) = 242^{+65}_{-55}$ fb with a significance of 6.4 standard deviations from the background-only hypothesis. These measurements are used to find bounds for five anomalous dimension-six operators which would affect the $\mathrm{t}\bar{\mathrm{t}}\mathrm{W}$ and $\mathrm{t}\bar{\mathrm{t}}\mathrm{Z}$ cross sections.CMS-PAS-TOP-14-021oai:cds.cern.ch:20371392015 |
spellingShingle | Particle Physics - Experiment CMS Collaboration Measurement of top quark pair production in association with a W or Z boson using event reconstruction techniques |
title | Measurement of top quark pair production in association with a W or Z boson using event reconstruction techniques |
title_full | Measurement of top quark pair production in association with a W or Z boson using event reconstruction techniques |
title_fullStr | Measurement of top quark pair production in association with a W or Z boson using event reconstruction techniques |
title_full_unstemmed | Measurement of top quark pair production in association with a W or Z boson using event reconstruction techniques |
title_short | Measurement of top quark pair production in association with a W or Z boson using event reconstruction techniques |
title_sort | measurement of top quark pair production in association with a w or z boson using event reconstruction techniques |
topic | Particle Physics - Experiment |
url | http://cds.cern.ch/record/2037139 |
work_keys_str_mv | AT cmscollaboration measurementoftopquarkpairproductioninassociationwithaworzbosonusingeventreconstructiontechniques |