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Paper   IPM / Particles / 11636
School of Particles and Accelerator
  Title:   Charged particle multiplicities in pp interactions at sqrt(s) = 0.9, 2.36, and 7 TeV
  Author(s): 
1.  Hessamaddin Arfaei
2.  Hamed Bakhshiansohi
3.  Seyed Mohsen Etesami
4.  Ali Fahim
5.  Majid Hashemi
6.  Abideh Jafari
7.  Mohsen Khakzad
8.  A Mohammadi
9.  Mojtaba Mohammadi Najafabadi
10.  Saeid Paktinat Mehdiabadi
11.  Batool Safarzadeh
12.  Maryam Zeinali
  Status:   Submitted
  Journal: JHEP
  Year:  2010
  Supported by:  IPM
  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 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 multiplicity distribution confirms the violation of Koba-Nielsen-Olesen scaling that has been observed at lower energies.

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