Transverse momentum spectra of charged particles in proton–proton collisions at $\sqrt{s}$=900  GeV with ALICE at the LHC

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The inclusive charged particle transverse momentum distribution is measured in proton–proton collisions at √s = 900 GeV at the LHC using the ALICE detector. The measurement is performed in the central pseudorapidity region (|η| < 0.8) over the transverse momentum range 0.15 < p T < 10 GeV/c. The correlation between transverse momentum and particle multiplicity is also studied. Results are presented for inelastic (INEL) and non-single-diffractive (NSD) events. The average transverse momentum for |η| < 0.8 is p T INEL = 0.483 ± 0.001 (stat.) ± 0.007 (syst.) GeV/c and p T NSD = 0.489 ± 0.001 (stat.) ± 0.007 (syst.) GeV/c, respectively. The data exhibit a slightly larger p T than measurements in wider pseudorapidity intervals. The results are compared to simulations with the Monte Carlo event generators PYTHIA and PHOJET.