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

Submission Date: 
24/09/2015
Article Information
Submission Form
System: 
p-p
Energy: 
900 GeV
Energy: 
2.36 TeV
Energy: 
2.76 TeV
Energy: 
7 TeV
Energy: 
8 TeV
Abstract Plain Text: 

 

 

The ALICE Collaboration has carried out 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 |h| < 2. Measurements were obtained for three event classes: inelastic, non-single diffractive and events with at least one charged particle in the pseudorapidity interval |h| < 1. The use of an improved track-counting algorithm combined with ALICE’s measurements of diffractive processes allows a higher precision compared to previous publications. A KNO scaling study was performed in pseudorapidity intervals |h| < 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.