Charged particle multiplicities in $pp$ interactions at $s=0.9$, 2.36, and 7 TeV

The CMS Collaboration (2011) Charged particle multiplicities in $pp$ interactions at $s=0.9$, 2.36, and 7 TeV. Journal of High Energy Physics, 2011, [079]. (doi:10.1007/JHEP01(2011)079).

Record type: Article

Abstract

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 s=0.9, 2.36, and 7 TeV, 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 7 TeV run in 2010. The multiplicity distribution at s √ =0.9TeV s=0.9TeV is in agreement with previous measurements. At higher energies the increase of the mean multiplicity with s √ 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.

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