Abstract
A detailed study of pseudorapidity densities and multiplicity distributions of primary charged particles produced in proton–proton collisions, at sqrt{s} = 0.9, 2.36, 2.76, 7 and 8 TeV, in the pseudorapidity range |eta |<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 |eta |<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 |eta |< 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.
Highlights
The multiplicity of emitted charged particles is one of the most basic characteristics of high-energy hadron collisions and has been the subject of longstanding experimental and theoretical studies, which have shaped the understanding of the strong interaction
Following on from earlier ALICE studies of global properties of proton–proton collisions [1,2,3,4,5,6,7,8], this publication presents a comprehensive set of measurements of the pseudorapidity density of primary1 charged particles and of their multiplicity distributions over the energy range covered by the LHC, from 0.9 to 8 TeV
We found that first category correlations are negligible compared to the last category, while the second category correlations can be factorized for fitting the multiplicity distribution
Summary
The multiplicity of emitted charged particles is one of the most basic characteristics of high-energy hadron collisions and has been the subject of longstanding experimental and theoretical studies, which have shaped the understanding of the strong interaction. At LHC energies, particle production is still dominated by soft processes but receives significant contributions from hard scattering, multiplicity and other global event properties measurements allow to explore both components. As these properties are used as input in Glauber inspired models [9,10,11,12], such studies are contributing to a better modelling of Pb–Pb collisions. Multiple collisions in the same bunch crossing, referred
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