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Paper   IPM / Particles / 11435
School of Particles and Accelerator
  Title:   Transverse-momentum and pseudorapidity distributions of charged hadrons in pp collisions at sqrt(s) = 7 TeV
1.  Hessamaddin Arfaei
2.  Hamed Bakhshiansohi
3.  Ali Fahim
4.  Abideh Jafari
5.  Mojtaba Mohammadi Najafabadi
6.  Saeid Paktinat
7.  Batool Safarzadeh
8.  Maryam Zeinali
  Status:   Published
  Journal: Phys. Rev. Lett.
  No.:  022002
  Vol.:  105
  Year:  2010
  Supported by:  IPM
Charged-hadron transverse-momentum and pseudorapidity distributions in proton-proton collisions at √s = 7 TeV are measured with the inner tracking system of the CMS detector at the LHC. The charged-hadron yield is obtained by counting the number of reconstructed hits, hit-pairs, and fully reconstructed charged-particle tracks. The combination of the three methods gives a charged-particle multiplicity per unit of pseudorapidity ||η| < 0.5 = 5.78±0.01\stat±0.23\syst for non-single-diffractive events, higher than predicted by commonly used models. The relative increase in charged-particle multiplicity from √s = 0.9 to 7 TeV is 66.1%±1.0%\stat±4.2%\syst. The mean transverse momentum is measured to be 0.545±0.005\stat±0.015\syst\GeVc. The results are compared with similar measurements at lower energies.

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