Naslov
Transverse-momentum and pseudorapidity distributions of charged hadrons in collisions at sqrt(s) = 7 TeV

Autori
Chatrchyan, S. ; ... ; Godinović, Nikola ; Lelas, Damir ; Lelas, Karlo ; Pleština, Roko ; Polić, Dunja ; Puljak, Ivica ; Antunović, Željko ; Dželalija, Mile ; Brigljević, Vuko ; Đurić, Senka ; Kadija, Krešo ; Morović, Srećko ; ... ; Weinberg, M.

Izvornik
Physical Review Letters (0031-9007) 105 (2010), 2; 022002-1

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
LHC; CMS; Physics; Particle Physics

Sažetak
Charged-hadron transverse-momentum and pseudorapidity distributions in proton-proton collisions at sqrt(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/deta|eta|<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 sqrt(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.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

Napomena
The CMS Collaboration

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