Transverse-momentum and pseudorapidity distributions of charged Hadrons in pp collisions at √s=7 TeV

Khachatryan, V. ; Mondal, N. K. ; et., al (2010) Transverse-momentum and pseudorapidity distributions of charged Hadrons in pp collisions at √s=7 TeV Physical Review Letters, 105 (2). e022002_1-e022002_14. ISSN 0031-9007

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Official URL: http://prl.aps.org/abstract/PRL/v105/i2/e022002

Related URL: http://dx.doi.org/http://prl.aps.org/abstract/PRL/v105/i2/e022002

Abstract

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.

Item Type:Article
Source:Copyright of this article belongs to The American Physical Society.
ID Code:75396
Deposited On:22 Dec 2011 13:54
Last Modified:22 Dec 2011 13:54

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