Search for Long-Lived Particles using Displaced Photons in $pp$ Collisions at sqrt(s) = 7 \TeV

The results of a search for supersymmetry are presented using long-lived particles decaying into photons and invisible particles. Events were collected at a center-of-mass energy of 7 TeV in proton-proton collisions by the CMS detector at the LHC. The search is performed in the context of gauge-medi...

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Autor principal: CMS Collaboration
Publicado: 2012
Materias:
Particle Physics - Experiment
Acceso en línea:http://cds.cern.ch/record/1459147
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author CMS Collaboration
author_facet CMS Collaboration
author_sort CMS Collaboration
collection CERN
description The results of a search for supersymmetry are presented using long-lived particles decaying into photons and invisible particles. Events were collected at a center-of-mass energy of 7 TeV in proton-proton collisions by the CMS detector at the LHC. The search is performed in the context of gauge-mediated symmetry breaking, where the lightest neutralino can have a non zero lifetime. The missing transverse energy and the time of impact of the photon on the surface of the electromagnetic calorimeter is used to search for an excess of events over the background expectation. After the final selection, using a data set of 4.86 fb$^{-1}$ no significant excess is observed, and limits are set on the mass and proper decay length of the neutralino. Limits of 220 GeV/c$^2$ for its mass and 6000 mm on the proper decay length are set at 95 \% CL.
id cern-1459147
institution Organización Europea para la Investigación Nuclear
publishDate 2012
record_format invenio
spelling cern-14591472019-09-30T06:29:59Zhttp://cds.cern.ch/record/1459147CMS CollaborationSearch for Long-Lived Particles using Displaced Photons in $pp$ Collisions at sqrt(s) = 7 \TeVParticle Physics - ExperimentThe results of a search for supersymmetry are presented using long-lived particles decaying into photons and invisible particles. Events were collected at a center-of-mass energy of 7 TeV in proton-proton collisions by the CMS detector at the LHC. The search is performed in the context of gauge-mediated symmetry breaking, where the lightest neutralino can have a non zero lifetime. The missing transverse energy and the time of impact of the photon on the surface of the electromagnetic calorimeter is used to search for an excess of events over the background expectation. After the final selection, using a data set of 4.86 fb$^{-1}$ no significant excess is observed, and limits are set on the mass and proper decay length of the neutralino. Limits of 220 GeV/c$^2$ for its mass and 6000 mm on the proper decay length are set at 95 \% CL.CMS-PAS-EXO-11-035oai:cds.cern.ch:14591472012
spellingShingle Particle Physics - Experiment
CMS Collaboration
Search for Long-Lived Particles using Displaced Photons in $pp$ Collisions at sqrt(s) = 7 \TeV
title Search for Long-Lived Particles using Displaced Photons in $pp$ Collisions at sqrt(s) = 7 \TeV
title_full Search for Long-Lived Particles using Displaced Photons in $pp$ Collisions at sqrt(s) = 7 \TeV
title_fullStr Search for Long-Lived Particles using Displaced Photons in $pp$ Collisions at sqrt(s) = 7 \TeV
title_full_unstemmed Search for Long-Lived Particles using Displaced Photons in $pp$ Collisions at sqrt(s) = 7 \TeV
title_short Search for Long-Lived Particles using Displaced Photons in $pp$ Collisions at sqrt(s) = 7 \TeV
title_sort search for long-lived particles using displaced photons in $pp$ collisions at sqrt(s) = 7 \tev
topic Particle Physics - Experiment
url http://cds.cern.ch/record/1459147
work_keys_str_mv AT cmscollaboration searchforlonglivedparticlesusingdisplacedphotonsinppcollisionsatsqrts7tev

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