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Search for heavy Majorana neutrinos in e+/- e+/- + jets and e+/- mu+/- + jets events in proton-proton collisions at sqrt(s) = 8 TeV

We report a search for heavy Majorana neutrinos (N) decaying into a W boson and a lepton using the CMS detector at the Large Hadron Collider. We search for a signature of two same-sign electrons and two jets or a same-sign electron-muon pair and two jets using 19.7~fb$^{-1}$ of data collected during...

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Autor principal: CMS Collaboration
Publicado: 2015
Materias:
Acceso en línea:http://cds.cern.ch/record/2052518
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author CMS Collaboration
author_facet CMS Collaboration
author_sort CMS Collaboration
collection CERN
description We report a search for heavy Majorana neutrinos (N) decaying into a W boson and a lepton using the CMS detector at the Large Hadron Collider. We search for a signature of two same-sign electrons and two jets or a same-sign electron-muon pair and two jets using 19.7~fb$^{-1}$ of data collected during 2012 in proton-proton collisions at a center-of-mass energy of 8 TeV. We find the data to be consistent with the expected standard model background and upper limits are set on $|V_{\ell \mathrm{N}}|^2$, as a function of Majorana neutrino mass from 40-500 GeV$/c^2$, where $V_{\ell \mathrm{N}}$ is the mixing element of the heavy neutrino with the standard model neutrino. The upper limits obtained for $|V_{e \mathrm{N}}|^2$ ($|V_{e \mathrm{N}} V_{\mu \mathrm{N}}^*|$) are 0.022 (0.009) for $m_\mathrm{N} =$ 90 GeV$/c^2$, 0.016 (0.009) for $m_\mathrm{N} =$ 200 GeV$/c^2$, and 0.72 (0.47) for $m_\mathrm{N} =$ 500 GeV$/c^2$. These results extend considerably the regions excluded by previous direct searches.
id cern-2052518
institution Organización Europea para la Investigación Nuclear
publishDate 2015
record_format invenio
spelling cern-20525182019-09-30T06:29:59Zhttp://cds.cern.ch/record/2052518CMS CollaborationSearch for heavy Majorana neutrinos in e+/- e+/- + jets and e+/- mu+/- + jets events in proton-proton collisions at sqrt(s) = 8 TeVParticle Physics - ExperimentWe report a search for heavy Majorana neutrinos (N) decaying into a W boson and a lepton using the CMS detector at the Large Hadron Collider. We search for a signature of two same-sign electrons and two jets or a same-sign electron-muon pair and two jets using 19.7~fb$^{-1}$ of data collected during 2012 in proton-proton collisions at a center-of-mass energy of 8 TeV. We find the data to be consistent with the expected standard model background and upper limits are set on $|V_{\ell \mathrm{N}}|^2$, as a function of Majorana neutrino mass from 40-500 GeV$/c^2$, where $V_{\ell \mathrm{N}}$ is the mixing element of the heavy neutrino with the standard model neutrino. The upper limits obtained for $|V_{e \mathrm{N}}|^2$ ($|V_{e \mathrm{N}} V_{\mu \mathrm{N}}^*|$) are 0.022 (0.009) for $m_\mathrm{N} =$ 90 GeV$/c^2$, 0.016 (0.009) for $m_\mathrm{N} =$ 200 GeV$/c^2$, and 0.72 (0.47) for $m_\mathrm{N} =$ 500 GeV$/c^2$. These results extend considerably the regions excluded by previous direct searches.CMS-PAS-EXO-14-014oai:cds.cern.ch:20525182015
spellingShingle Particle Physics - Experiment
CMS Collaboration
Search for heavy Majorana neutrinos in e+/- e+/- + jets and e+/- mu+/- + jets events in proton-proton collisions at sqrt(s) = 8 TeV
title Search for heavy Majorana neutrinos in e+/- e+/- + jets and e+/- mu+/- + jets events in proton-proton collisions at sqrt(s) = 8 TeV
title_full Search for heavy Majorana neutrinos in e+/- e+/- + jets and e+/- mu+/- + jets events in proton-proton collisions at sqrt(s) = 8 TeV
title_fullStr Search for heavy Majorana neutrinos in e+/- e+/- + jets and e+/- mu+/- + jets events in proton-proton collisions at sqrt(s) = 8 TeV
title_full_unstemmed Search for heavy Majorana neutrinos in e+/- e+/- + jets and e+/- mu+/- + jets events in proton-proton collisions at sqrt(s) = 8 TeV
title_short Search for heavy Majorana neutrinos in e+/- e+/- + jets and e+/- mu+/- + jets events in proton-proton collisions at sqrt(s) = 8 TeV
title_sort search for heavy majorana neutrinos in e+/- e+/- + jets and e+/- mu+/- + jets events in proton-proton collisions at sqrt(s) = 8 tev
topic Particle Physics - Experiment
url http://cds.cern.ch/record/2052518
work_keys_str_mv AT cmscollaboration searchforheavymajorananeutrinosineejetsandemujetseventsinprotonprotoncollisionsatsqrts8tev