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Measurement of the centrality dependence of the charged-particle pseudorapidity distribution in proton–lead collisions at $\sqrt{s_{_\text {NN}}} = 5.02$  TeV with the ATLAS detector

The collaboration
Eur.Phys.J. C76 (2016) 199, 2016

Abstract (data abstract)
CERN-LHC. The centrality dependence of the mean charged-particle multiplicity as a function of pseudorapidity is measured in approximately 1 $\mu$b$^{-1}$ of proton-lead collisions at a nucleon-nucleon centre-of-mass energy of $\sqrt{s_{_{\text{NN}}}}=5.02$ TeV using the ATLAS detector at the Large Hadron Collider. Charged particles with absolute pseudorapidity less than 2.7 are reconstructed using the ATLAS pixel detector. The $p$+Pb collision centrality is characterised by the total transverse energy measured in the Pb-going direction of the forward calorimeter. %over the pseudorapidity interval $-4.9 <\eta <-3.1$. The charged-particle pseudorapidity distributions are found to vary strongly with centrality, with an increasing asymmetry between the proton-going and Pb-going directions as the collisions become more central. Three different estimations of the number of nucleons participating in the $p$+Pb collision have been carried out using the Glauber model as well as two Glauber-Gribov inspired extensions to the Glauber model. Charged-particle multiplicities per participant pair are found to vary differently for these three models, highlighting the importance of including colour fluctuations in nucleon-nucleon collisions in the modelling of the initial state of $p$+Pb collisions.

• #### Table 1

Data from Table 4 of the paper

10.17182/hepdata.69240.v1/t1

The $\langle N_{\mathrm{part}} \rangle$ values and their uncertainties for centrality intervals used in this analysis together with asymmetric systematic uncertainties...

• #### Table 2

Data from Figure 7 left

10.17182/hepdata.69240.v1/t2

Centrality dependence of the charged particle pseudorapidity distribution measured in several centrality intervals for charged particles with $p_{T} > 0.1$...

• #### Table 3

Data from Figure 7 right

10.17182/hepdata.69240.v1/t3

Centrality dependence of the charged particle pseudorapidity distribution measured in several centrality intervals for charged particles with $p_{T} > 0$...

• #### Table 4

Data from Figure 8

10.17182/hepdata.69240.v1/t4

Ratios of $dN_{ch}/d\eta$ distributions measured in different centrality intervals to that in the peripheral (60â€“90%) centrality interval. The first uncertainty...

• #### Table 5

Data from Figure 12.

10.17182/hepdata.69240.v1/t5

Charged-particle pseudorapidity distribution $dN_{ch}/d\eta$ as a function of centrality (related to the $\langle N_{\mathrm{part}} \rangle$ by Table 3) for several...