Measurement of the Charged-Hadron Multiplicity in Proton-Proton Collisions at LHC with the CMS Detector

Charged-hadron pseudorapidity densities and multiplicity distributions in protonproton collisions at s = 0.9, 2.36, 7.0 TeV were measured with the inner tracking system of the CMS detector at the LHC. The charged-hadron yield was obtained by counting the number of hit-pairs (tracklets). The charged-...

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Autor principal: Lee, Yen-Jie
Lenguaje:eng
Publicado: 2011
Materias:
Acceso en línea:http://cds.cern.ch/record/1423356
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author Lee, Yen-Jie
author_facet Lee, Yen-Jie
author_sort Lee, Yen-Jie
collection CERN
description Charged-hadron pseudorapidity densities and multiplicity distributions in protonproton collisions at s = 0.9, 2.36, 7.0 TeV were measured with the inner tracking system of the CMS detector at the LHC. The charged-hadron yield was obtained by counting the number of hit-pairs (tracklets). The charged-particle multiplicity per unit ofpseudorapidity d N ch /d η ||η|<0.5 at s = 7.0 TeV is 5.78 ± 0.01(stat.) ± 0.23(syst.) for nonsingle-diffractive events, higher than predicted by commonly used models. The relativeincrease in charged-particle multiplicity from s = 0.9 to 7 TeV is 66.1% ± 1.0%(stat.) ±4.2%(syst.) and strong KNO violation is observed in the multiplicity distributions. Results are compared with low energy measurements.Thesis Supervisor: Wit BuszaTitle: Francis Friedman Professor of Physics
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institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2011
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spelling cern-14233562019-09-30T06:29:59Zhttp://cds.cern.ch/record/1423356engLee, Yen-JieMeasurement of the Charged-Hadron Multiplicity in Proton-Proton Collisions at LHC with the CMS DetectorParticle Physics - ExperimentCharged-hadron pseudorapidity densities and multiplicity distributions in protonproton collisions at s = 0.9, 2.36, 7.0 TeV were measured with the inner tracking system of the CMS detector at the LHC. The charged-hadron yield was obtained by counting the number of hit-pairs (tracklets). The charged-particle multiplicity per unit ofpseudorapidity d N ch /d η ||η|<0.5 at s = 7.0 TeV is 5.78 ± 0.01(stat.) ± 0.23(syst.) for nonsingle-diffractive events, higher than predicted by commonly used models. The relativeincrease in charged-particle multiplicity from s = 0.9 to 7 TeV is 66.1% ± 1.0%(stat.) ±4.2%(syst.) and strong KNO violation is observed in the multiplicity distributions. Results are compared with low energy measurements.Thesis Supervisor: Wit BuszaTitle: Francis Friedman Professor of PhysicsCERN-THESIS-2011-236CMS-TS-2011-052oai:cds.cern.ch:14233562011
spellingShingle Particle Physics - Experiment
Lee, Yen-Jie
Measurement of the Charged-Hadron Multiplicity in Proton-Proton Collisions at LHC with the CMS Detector
title Measurement of the Charged-Hadron Multiplicity in Proton-Proton Collisions at LHC with the CMS Detector
title_full Measurement of the Charged-Hadron Multiplicity in Proton-Proton Collisions at LHC with the CMS Detector
title_fullStr Measurement of the Charged-Hadron Multiplicity in Proton-Proton Collisions at LHC with the CMS Detector
title_full_unstemmed Measurement of the Charged-Hadron Multiplicity in Proton-Proton Collisions at LHC with the CMS Detector
title_short Measurement of the Charged-Hadron Multiplicity in Proton-Proton Collisions at LHC with the CMS Detector
title_sort measurement of the charged-hadron multiplicity in proton-proton collisions at lhc with the cms detector
topic Particle Physics - Experiment
url http://cds.cern.ch/record/1423356
work_keys_str_mv AT leeyenjie measurementofthechargedhadronmultiplicityinprotonprotoncollisionsatlhcwiththecmsdetector