Charged particle multiplicities in pp interactions at sqrt(s) = 0.9, 2.36, and 7 TeV
- CMS Collaboration
- Quertenmont, Loic
- Khachatryan, Vardan
- Basegmez, Suzan
- Bruno, Giacomo Luca
- Caudron, Julien
- Ceard, Ludivine
- Cortina Gil, Eduardo
- de Favereau de Jeneret, Jérôme
- Delaere, Christophe
- Favart, Denis
- Forthomme, Laurent
- Giammanco, Andrea
- Grégoire, Ghislain
- Hollar, Jonathan
- Lemaitre, Vincent
- Liao, Junhui
- Militaru, Otilia
- Nuttens, Claude
- Ovyn, Séverine
- Pagano, Davide
- Pin, Arnaud
- Piotrzkowski, Krzysztof
- Schul, Nicolas
DOIAbstract
Measurements of primary charged hadron multiplicity distributions are presented for non-single-diffractive events in proton-proton collisions at centre-of-mass energies of sqrt(s) = 0.9, 2.36, and 7 TeV, in five pseudorapidity ranges from |eta|<0.5 to |eta|<2.4. The data were collected with the minimum-bias trigger of the CMS experiment during the LHC commissioning runs in 2009 and the 7 TeV run in 2010. The multiplicity distribution at sqrt(s) = 0.9 TeV is in agreement with previous measurements. At higher energies the increase of the mean multiplicity with sqrt(s) is underestimated by most event generators. The average transverse momentum as a function of the multiplicity is also presented. The measurement of higher-order moments of the m...
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