Charged particle multiplicities in pp interactions at √ s = 0.9 , 2.36, and 7 TeV
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Measurements of primary charged hadron multiplicity distributions are presented for non-single-diffractive events in proton-proton collisions at centre-of-mass energies of √s = 0.9, 2.36, and 7TeV, in five pseudorapidity ranges from |η| < 0.5 to |η| < 2.4. The data were collected with the minimum-bias trigger of the CMS experiment during the LHC commissioning runs in 2009 and the 7TeV run in 2010. The multiplicity distribution at √s = 0.9 TeV is in agreement with previous measurements. At higher energies the increase of the mean multiplicity with √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 multiplicity distribution confirms the violation of Koba-Nielsen-Olesen scaling that has been observed at lower energies.
Journal of High Energy Physics
Springer Science and Business Media LLC
Khachatryan, V., et al. "Charged Particle Multiplicities in Pp Interactions at Root S=0:9, 2:36, and 7 Tev." Journal of High Energy Physics 1 (2011).
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