Transverse-Momentum and Pseudorapidity Distributions of Charged Hadrons in pp Collisions at root s=7 TeV
CMS Collaboration (ukupan broj autora: 2072)
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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 LT 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.
Извор:Physical Review Letters, 2010, 105, 2
- FMSR (Austria), FNRS, Belgium, CNPq, CAPES, FAPERJ, and FAPESP (Brazil), MES (Bulgaria), CERN, CAS, MoST, and NSFC (China), COLCIENCIAS (Colombia), MSES (Croatia), RPF (Cyprus), 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), LAS (Lithuania), 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.)