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

Charged particle multiplicities in $pp$ interactions at $s=0.9$, 2.36, and 7 TeV
Charged particle multiplicities in $pp$ interactions at $s=0.9$, 2.36, and 7 TeV
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.
Khachatryan, Vardan
375bcfe5-df1a-41ad-9a90-553e557ef6d6
Belyaev, Alexander
6bdb9638-5ff9-4b65-a8f2-34bae3ac34b3
The CMS Collaboration
Khachatryan, Vardan
375bcfe5-df1a-41ad-9a90-553e557ef6d6
Belyaev, Alexander
6bdb9638-5ff9-4b65-a8f2-34bae3ac34b3

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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Published date: 2011
Organisations: Physics & Astronomy

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Local EPrints ID: 411295
URI: http://eprints.soton.ac.uk/id/eprint/411295
PURE UUID: 1950089c-5f3d-4d99-885c-7ea02744ff84
ORCID for Alexander Belyaev: ORCID iD orcid.org/0000-0002-1733-4408

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Date deposited: 16 Jun 2017 16:32
Last modified: 10 Nov 2021 03:19

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Contributors

Author: Vardan Khachatryan
Corporate Author: The CMS Collaboration

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