Journal
JOURNAL OF HIGH ENERGY PHYSICS
Volume -, Issue 8, Pages -Publisher
SPRINGER
DOI: 10.1007/JHEP08(2011)141
Keywords
Hadron-Hadron Scattering
Categories
Funding
- FMSR (Austria)
- FNRS
- FWO (Belgium)
- CNPq
- CAPES
- FAPERJ
- FAPESP (Brazil)
- MES (Bulgaria)
- CERN
- CAS
- MoST
- NSFC (China)
- COLCIENCIAS (Colombia)
- MSES (Croatia)
- RPF (Cyprus)
- Academy of Sciences and NICPB (Estonia)
- Academy of Finland
- ME
- HIP (Finland)
- CEA
- CNRS/IN2P3 (France)
- BMBF
- DFG
- HGF (Germany)
- GSRT (Greece)
- OTKA
- NKTH (Hungary)
- DAE
- DST (India)
- IPM (Iran)
- SFI (Ireland)
- INFN (Italy)
- NRF
- WCU (Korea)
- LAS (Lithuania)
- CINVES-TAV
- CONACYT
- SEP
- UASLP-FAI (Mexico)
- PAEC (Pakistan)
- SCSR (Poland)
- FCT (Portugal)
- JINR (Armenia, Belarus, Georgia, Ukraine, Uzbekistan)
- MST
- MAE (Russia)
- MSTD (Serbia)
- MICINN
- CPAN (Spain)
- Swiss Funding Agencies (Switzerland)
- NSC (Taipei)
- TUBITAK
- TAEK (Turkey)
- STFC (United Kingdom)
- DOE
- NSF (USA)
- Marie-Curie programme
- European Research Council (European Union)
- Leventis Foundation
- A. P. Sloan Foundation
- Alexander von Humboldt Foundation
- Associazione per lo Sviluppo Scientifico e Tecnologico del Piemonte (Italy)
- Belgian Federal Science Policy Office
- Fonds pour la Formation a la Recherche dans l'Industrie et dans l'Agriculture (FRIA-Belgium)
- Agentschap voor Innovatie door Wetenschap en Technologie (IWT-Belgium)
- STFC [ST/I005912/1, ST/F007094/1, ST/H00081X/2, ST/I505572/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/I005912/1, GRIDPP, ST/I505572/1, ST/I005912/1 GRIDPP, ST/F007094/1, PP/D004284/1] Funding Source: researchfish
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A measurement is presented of the charged hadron multiplicity in hadronic PbPb collisions, as a function of pseudorapidity and centrality, at a collision energy of 2.76 TeV per nucleon pair. The data sample is collected using the CMS detector and a minimum-bias trigger, with the CMS solenoid off. The number of charged hadrons is measured both by counting the number of reconstructed particle hits and by forming hit doublets of pairs of layers in the pixel detector. The two methods give consistent results. The charged hadron multiplicity density, dN(ch)/d eta vertical bar(eta=0), for head-on collisions is found to be 1612 +/- 55, where the uncertainty is dominated by systematic effects. Comparisons of these results to previous measurements and to various models are also presented.
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