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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Lenguaje: | eng |
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2011
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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 |
id | cern-1423356 |
institution | Organización Europea para la Investigación Nuclear |
language | eng |
publishDate | 2011 |
record_format | invenio |
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 |