Pseudorapidity distributions of charged particles as a function of mid- and forward rapidity multiplicities in pp collisions at $$\sqrt{s}$$ = 5.02, 7 and 13 TeV

Abstract

The 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.

Rivet and the analysis preservation in heavy-ion collisions experiments

“…The self-normalized estimator using the SPD was also tested using the measurements in Ref. [15]. Figure 9 presents the charged particle pseudorapidity distribution in pp collisions at √ s = 5.02 TeV.…”

Forward rapidity J/ψ production as a function of charged-particle multiplicity in pp collisions at $$ \sqrt{s} $$ = 5.02 and 13 TeV

“…syst.) for pp collisions at √ s = 5.02 TeV and 13 TeV, respectively [49]. A summary of dN ch /dη/ dN ch /dη values for the INEL > 0 class is shown in table 1.…”

“…The summary of systematic uncertainties for charged-particle density measurements. The value marked with (*) is taken from the ref [49]…”

Study of very forward energy and its correlation with particle production at midrapidity in pp and p-Pb collisions at the LHC

“…The multiplicity selection is based on the number of tracklets measured in the SPD in both collision systems, as described in refs. [19,20]. The average charged-particle multiplicity values, dN ch /dη , are listed in table 2 for each selected multiplicity interval.…”

“…-particle multiplicity classes based on the SPD tracklet estimator and corresponding dN ch /dη values in 2 units of pseudorapidity around midrapidity, |η| < 1 in pp collisions at 13 TeV[19] and −1.465 < η < 0.535 in p-Pb collisions at 8.16 TeV[20]). The MB values for the two colliding systems are given in the bottom rows.…”