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Measurement of the ZZ production cross section and $\mathrm{Z} \to \ell\ell\ell'\ell'$ branching fraction in pp collisions at $\sqrt{s}=13~\mathrm{TeV}$

Four-lepton production in proton-proton collisions, ${\mathrm{pp}} \rightarrow {\mathrm{Z}} / \gamma^* {\mathrm{Z}}/ \gamma^* \rightarrow \ell\ell\ell'\ell'$, where ($\ell, \ell' = $ e or $\mu$), is studied at a center-of-mass energy of $13~\mathrm{TeV}$ with the CMS detector at the L...

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Autor principal: CMS Collaboration
Publicado: 2016
Materias:
Acceso en línea:http://cds.cern.ch/record/2148595
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author CMS Collaboration
author_facet CMS Collaboration
author_sort CMS Collaboration
collection CERN
description Four-lepton production in proton-proton collisions, ${\mathrm{pp}} \rightarrow {\mathrm{Z}} / \gamma^* {\mathrm{Z}}/ \gamma^* \rightarrow \ell\ell\ell'\ell'$, where ($\ell, \ell' = $ e or $\mu$), is studied at a center-of-mass energy of $13~\mathrm{TeV}$ with the CMS detector at the LHC. The data sample corresponds to an integrated luminosity of $2.6~\mathrm{fb}^{-1}$. The ZZ production cross section, $\sigma(\mathrm{pp} \to \mathrm{ZZ}) = 14.6 ^{+1.9}_{-1.8} \mathrm{(stat)} ^{+0.5}_{-0.3} \mathrm{(syst)} \pm 0.2 \mathrm{(theo)} \pm 0.4 \mathrm{(lum)}~\mathrm{pb}$, is measured for both Z bosons produced in the mass region $60 < m_{\mathrm{Z}} < 120~\mathrm{GeV}$. The Z branching fraction to four leptons is measured to be $\mathcal{B}(\mathrm{Z} \to \ell\ell\ell'\ell') = 4.9 _{-0.7}^{+0.8} \mathrm{(stat)} _{-0.2}^{+0.3} \mathrm{(syst)} _{-0.1}^{+0.2} \mathrm{(theo)} \pm 0.1 \mathrm{(lum)} \times 10^{-6}$ for the four-lepton mass in the range $80 < m_{\ell\ell\ell'\ell'} < 100~\mathrm{GeV}$ and dilepton mass $m_{\ell\ell'} > 4~\mathrm{GeV}$ for all opposite-charge lepton pairs. The results are compared to standard model predictions.
id cern-2148595
institution Organización Europea para la Investigación Nuclear
publishDate 2016
record_format invenio
spelling cern-21485952019-09-30T06:29:59Zhttp://cds.cern.ch/record/2148595CMS CollaborationMeasurement of the ZZ production cross section and $\mathrm{Z} \to \ell\ell\ell'\ell'$ branching fraction in pp collisions at $\sqrt{s}=13~\mathrm{TeV}$Particle Physics - ExperimentFour-lepton production in proton-proton collisions, ${\mathrm{pp}} \rightarrow {\mathrm{Z}} / \gamma^* {\mathrm{Z}}/ \gamma^* \rightarrow \ell\ell\ell'\ell'$, where ($\ell, \ell' = $ e or $\mu$), is studied at a center-of-mass energy of $13~\mathrm{TeV}$ with the CMS detector at the LHC. The data sample corresponds to an integrated luminosity of $2.6~\mathrm{fb}^{-1}$. The ZZ production cross section, $\sigma(\mathrm{pp} \to \mathrm{ZZ}) = 14.6 ^{+1.9}_{-1.8} \mathrm{(stat)} ^{+0.5}_{-0.3} \mathrm{(syst)} \pm 0.2 \mathrm{(theo)} \pm 0.4 \mathrm{(lum)}~\mathrm{pb}$, is measured for both Z bosons produced in the mass region $60 < m_{\mathrm{Z}} < 120~\mathrm{GeV}$. The Z branching fraction to four leptons is measured to be $\mathcal{B}(\mathrm{Z} \to \ell\ell\ell'\ell') = 4.9 _{-0.7}^{+0.8} \mathrm{(stat)} _{-0.2}^{+0.3} \mathrm{(syst)} _{-0.1}^{+0.2} \mathrm{(theo)} \pm 0.1 \mathrm{(lum)} \times 10^{-6}$ for the four-lepton mass in the range $80 < m_{\ell\ell\ell'\ell'} < 100~\mathrm{GeV}$ and dilepton mass $m_{\ell\ell'} > 4~\mathrm{GeV}$ for all opposite-charge lepton pairs. The results are compared to standard model predictions.CMS-PAS-SMP-16-001oai:cds.cern.ch:21485952016
spellingShingle Particle Physics - Experiment
CMS Collaboration
Measurement of the ZZ production cross section and $\mathrm{Z} \to \ell\ell\ell'\ell'$ branching fraction in pp collisions at $\sqrt{s}=13~\mathrm{TeV}$
title Measurement of the ZZ production cross section and $\mathrm{Z} \to \ell\ell\ell'\ell'$ branching fraction in pp collisions at $\sqrt{s}=13~\mathrm{TeV}$
title_full Measurement of the ZZ production cross section and $\mathrm{Z} \to \ell\ell\ell'\ell'$ branching fraction in pp collisions at $\sqrt{s}=13~\mathrm{TeV}$
title_fullStr Measurement of the ZZ production cross section and $\mathrm{Z} \to \ell\ell\ell'\ell'$ branching fraction in pp collisions at $\sqrt{s}=13~\mathrm{TeV}$
title_full_unstemmed Measurement of the ZZ production cross section and $\mathrm{Z} \to \ell\ell\ell'\ell'$ branching fraction in pp collisions at $\sqrt{s}=13~\mathrm{TeV}$
title_short Measurement of the ZZ production cross section and $\mathrm{Z} \to \ell\ell\ell'\ell'$ branching fraction in pp collisions at $\sqrt{s}=13~\mathrm{TeV}$
title_sort measurement of the zz production cross section and $\mathrm{z} \to \ell\ell\ell'\ell'$ branching fraction in pp collisions at $\sqrt{s}=13~\mathrm{tev}$
topic Particle Physics - Experiment
url http://cds.cern.ch/record/2148595
work_keys_str_mv AT cmscollaboration measurementofthezzproductioncrosssectionandmathrmztoellellellellbranchingfractioninppcollisionsatsqrts13mathrmtev