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First Measurement of the cross section ratio ttbb/ttjj in pp Collisions at sqrt{s

We present the first measurement of the cross section ratio $\sigma$($t\bar{t}b\bar{b}$)/$\sigma$($t\bar{t}jj$) in the dilepton decay mode, using a data sample corresponding to an integrated luminosity of $5~\rm{fb}^{-1}$ collected in pp collisions at $\sqrt{s}$ = 7 TeV with the CMS detector at the...

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Autor principal: CMS Collaboration
Publicado: 2012
Materias:
Acceso en línea:http://cds.cern.ch/record/1479150
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author CMS Collaboration
author_facet CMS Collaboration
author_sort CMS Collaboration
collection CERN
description We present the first measurement of the cross section ratio $\sigma$($t\bar{t}b\bar{b}$)/$\sigma$($t\bar{t}jj$) in the dilepton decay mode, using a data sample corresponding to an integrated luminosity of $5~\rm{fb}^{-1}$ collected in pp collisions at $\sqrt{s}$ = 7 TeV with the CMS detector at the LHC. The cross section ratio $\sigma$($t\bar{t}b\bar{b}$)/$\sigma$($t\bar{t}jj$) is measured in the visible phase space corresponding to the detector acceptance, and corrected to particle level. The measurement is performed by means of a fit to the measured multiplicity distribution of $b$-tagged jets in a sample of dileptonic top quark pair candidate events with at least four reconstructed jets. The result of the measurement, $3.6 \pm 1.1 ({\rm stat.}) \pm 0.9 ({\rm syst.}) \%$, is compared with various theory predictions.
id cern-1479150
institution Organización Europea para la Investigación Nuclear
publishDate 2012
record_format invenio
spelling cern-14791502019-09-30T06:29:59Zhttp://cds.cern.ch/record/1479150CMS CollaborationFirst Measurement of the cross section ratio ttbb/ttjj in pp Collisions at sqrt{sParticle Physics - ExperimentWe present the first measurement of the cross section ratio $\sigma$($t\bar{t}b\bar{b}$)/$\sigma$($t\bar{t}jj$) in the dilepton decay mode, using a data sample corresponding to an integrated luminosity of $5~\rm{fb}^{-1}$ collected in pp collisions at $\sqrt{s}$ = 7 TeV with the CMS detector at the LHC. The cross section ratio $\sigma$($t\bar{t}b\bar{b}$)/$\sigma$($t\bar{t}jj$) is measured in the visible phase space corresponding to the detector acceptance, and corrected to particle level. The measurement is performed by means of a fit to the measured multiplicity distribution of $b$-tagged jets in a sample of dileptonic top quark pair candidate events with at least four reconstructed jets. The result of the measurement, $3.6 \pm 1.1 ({\rm stat.}) \pm 0.9 ({\rm syst.}) \%$, is compared with various theory predictions.CMS-PAS-TOP-12-024oai:cds.cern.ch:14791502012
spellingShingle Particle Physics - Experiment
CMS Collaboration
First Measurement of the cross section ratio ttbb/ttjj in pp Collisions at sqrt{s
title First Measurement of the cross section ratio ttbb/ttjj in pp Collisions at sqrt{s
title_full First Measurement of the cross section ratio ttbb/ttjj in pp Collisions at sqrt{s
title_fullStr First Measurement of the cross section ratio ttbb/ttjj in pp Collisions at sqrt{s
title_full_unstemmed First Measurement of the cross section ratio ttbb/ttjj in pp Collisions at sqrt{s
title_short First Measurement of the cross section ratio ttbb/ttjj in pp Collisions at sqrt{s
title_sort first measurement of the cross section ratio ttbb/ttjj in pp collisions at sqrt{s
topic Particle Physics - Experiment
url http://cds.cern.ch/record/1479150
work_keys_str_mv AT cmscollaboration firstmeasurementofthecrosssectionratiottbbttjjinppcollisionsatsqrts