Abstract
Charged-hadron transverse-momentum and pseudorapidity distributions in proton-proton collisions at 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 for non-single-diffractive events, higher than predicted by commonly used models. The relative increase in charged-particle multiplicity from to 7 TeV is . The mean transverse momentum is measured to be . The results are compared with similar measurements at lower energies.
- Received 18 May 2010
DOI:https://doi.org/10.1103/PhysRevLett.105.022002
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© 2010 CERN, for the CMS Collaboration
Synopsis
Background checking at LHC
Published 6 July 2010
Preliminary measurements of particle collisions at get a handle on background events at this unprecedented energy.
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