Journal
PHYSICAL REVIEW LETTERS
Volume 105, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.105.022002
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- FMSR (Austria)
- FNRS, Belgium
- CNPq, CAPES, FAPERJ, and FAPESP (Brazil)
- MES (Bulgaria)
- CERN
- CAS, MoST, and NSFC (China)
- COLCIENCIAS (Colombia)
- MSES (Croatia)
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- Academy of Sciences and NICPB (Estonia)
- Academy of Finland, ME, and HIP (Finland)
- CEA and CNRS/IN2P3 (France)
- BMBF, DFG, and HGF (Germany)
- GSRT (Greece)
- OTKA and NKTH (Hungary)
- DAE and DST (India)
- IPM (Iran)
- SFI (Ireland)
- INFN (Italy)
- NRF and WCU (Korea)
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- CINVESTAV, CONACYT, SEP, and UASLP-FAI (Mexico)
- PAEC (Pakistan)
- SCSR (Poland)
- FCT (Portugal)
- JINR (Armenia, Belarus, Georgia, Ukraine, Uzbekistan)
- MST and MAE (Russia)
- MSTDS (Serbia)
- MICINN and CPAN (Spain)
- Swiss Funding Agencies (Switzerland)
- NSC (Taipei)
- TUBITAK and TAEK (Turkey)
- STFC (U. K.)
- DOE and NSF (U. S.)
- Direct For Mathematical & Physical Scien
- Division Of Physics [0758170, 0802184] Funding Source: National Science Foundation
- Science and Technology Facilities Council [ST/I505572/1, ST/I002839/1, ST/F007094/1, ST/G502412/1, GRIDPP, ST/G502347/1, CMS, ST/F006748/1, PP/D004284/1, ST/I002200/1, PP/E002722/1, ST/I000410/1] Funding Source: researchfish
- STFC [ST/F006748/1, ST/I000410/1, ST/I002839/1, ST/F007094/1, ST/G502412/1, PP/E002722/1, ST/I002200/1, ST/G502347/1, ST/I505572/1, ST/H00081X/2] Funding Source: UKRI
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Charged-hadron transverse-momentum and pseudorapidity distributions in proton-proton collisions at root 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(ch)/d eta vertical bar(vertical bar eta vertical bar<0.5) = 5.78 +/- 0.01(stat) +/- 0.23(stat) for non-single-diffractive events, higher than predicted by commonly used models. The relative increase in charged-particle multiplicity from root 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.
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