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

Abstract

The inclusive charged particle transverse momentum distribution is measured in proton-proton collisions at $\sqrt{s}=900$ GeV at the LHC using the ALICE detector. The measurement is performed in the central pseudorapidity region $(|\eta |<0.8)$ over the transverse momentum range $0.15<p_{\mathrm{T}}<10$ 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 $|\eta |<0.8$ is ${⟨p_{\mathrm{T}}⟩}_{\mathrm{INEL}}=0.483\pm 0.001$ (stat.) $\pm 0.007$ (syst.) GeV/$c$ and ${⟨p_{\mathrm{T}}⟩}_{\mathrm{NSD}}=0.489\pm 0.001$ (stat.) $\pm 0.007$ (syst.) GeV/$c$, respectively. The data exhibit a slightly larger $⟨p_{\mathrm{T}}⟩$ than measurements in wider pseudorapidity intervals. The results are compared to simulations with the Monte Carlo event generators PYTHIA and PHOJET.

20 pages, 8 figures, 2 tables, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/3902

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