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Paper
IPM / Particles And Accelerator / 11435 |
School of Particles and Accelerator
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Title: |
Transverse-momentum and pseudorapidity distributions of charged hadrons in pp collisions at sqrt(s) = 7 TeV
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Author(s): |
| 1 . |
Hessamaddin Arfaei
| | 2 . |
Hamed Bakhshiansohi
| | 3 . |
Ali Fahim
| | 4 . |
Abideh Jafari
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Mojtaba Mohammadi Najafabadi
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Saeid Paktinat
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Batool Safarzadeh
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Maryam Zeinali
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Status: |
Preprint
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Journal: |
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Year: |
2010
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Supported by: |
IPM
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Abstract: |
Charged-hadron transverse-momentum and pseudorapidity distributions in proton-proton collisions at Ös = 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 ||h| < 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 Ös = 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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