Charged-particle multiplicities in proton–proton collisions at √s = 0.9 to 8 TeV

J. Adam, D. Alexandre, L. S. Barnby, David Evans, Katie Graham, Peter Jones, Anton Jusko, Marian Krivda, Graham Lee, Roman Lietava, Orlando Villalobos Baillie, Nima Zardoshti

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A detailed study of pseudorapidity densities and multiplicity distributions of primary charged particles produced in proton–proton collisions, at √s = 0.9, 2.36, 2.76, 7 and 8 TeV, in the pseudorapidity range |η|<2, was carried out using the ALICE detector. Measurements were obtained for three event classes: inelastic, non-single diffractive and events with at least one charged particle in the pseudorapidity interval |η| < 1. The use of an improved track-counting algorithm combined with ALICE’s measurements of diffractive processes allows a higher precision compared to our previous publications. A KNO scaling study was performed in the pseudorapidity intervals |η|<0.5, 1.0 and 1.5. The data are compared to other experimental results and to models as implemented in Monte Carlo event generators PHOJET and recent tunes of PYTHIA6, PYTHIA8 and EPOS.
Original languageEnglish
Article number33
Number of pages39
JournalEuropean Physical Journal C
Issue number1
Early online date17 Jan 2017
Publication statusE-pub ahead of print - 17 Jan 2017


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