AbstractThe multiplicity dependence of the pseudorapidity density of charged particles in proton–proton (pp) collisions at centre-of-mass energies $$\sqrt{s}~=~5.02$$
s
=
5.02
, 7 and 13 TeV measured by ALICE is reported. The analysis relies on track segments measured in the midrapidity range ($$|\eta | < 1.5$$
|
η
|
<
1.5
). Results are presented for inelastic events having at least one charged particle produced in the pseudorapidity interval $$|\eta |<1$$
|
η
|
<
1
. The multiplicity dependence of the pseudorapidity density of charged particles is measured with mid- and forward rapidity multiplicity estimators, the latter being less affected by autocorrelations. A detailed comparison with predictions from the PYTHIA 8 and EPOS LHC event generators is also presented. The results can be used to constrain models for particle production as a function of multiplicity in pp collisions.
Measurement of the forward charged particle pseudorapidity density in pp collisions at $$\sqrt{s} = 8$$ s = 8 TeV using a displaced interaction point
