Transverse-momentum and pseudorapidity distributions of charged hadrons in pp collisions at sqrt(s) = 7 TeV
Charged-hadron transverse-momentum and pseudorapidity distributions in proton-proton collisions at {radical}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 dN{sub ch}/d{eta}|{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 {radical}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.
- Research Organization:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC02-07CH11359
- OSTI ID:
- 981482
- Report Number(s):
- FERMILAB-PUB-10-170-CMS; ISSN 1079-7114; arXiv eprint number arXiv:1005.3299; TRN: US1003818
- Journal Information:
- Phys.Rev.Lett.105:022002,2010, Vol. 105, Issue 2; ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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