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Phys. Rev. Lett. 105, 022002 (2010) [14 pages]

Transverse-Momentum and Pseudorapidity Distributions of Charged Hadrons in pp Collisions at √s=7  TeV

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V. Khachatryan et al. (CMS Collaboration)
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Received 18 May 2010; published 6 July 2010

See accompanying Physics Synopsis

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 dNch/dη||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)  GeV/c. The results are compared with similar measurements at lower energies.

Published by the American Physical Society under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

© 2010 CERN, for the CMS Collaboration

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.105.022002
DOI:
10.1103/PhysRevLett.105.022002
PACS:
13.85.Ni
 
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