Abstract
Multiplicity distributions of charged particles as a function of pseudorapidity dNch/dη have been measured by the ATLAS Collaboration in p + Pb collisions at sNN=5.02TeV at the LHC. The multiplicity of charged particles was measured in |η|<2.7 using combinations of correlated space points into tracklets in the Pixel detector. These measurements are presented as a function of the centrality of the collision defined by forward energy deposited in 3.1<η<4.9 and three Glauber type Monte-Carlo simulations of the collisions. The measured multiplicity distributions have similar shapes as the ones measured at RHIC in d + Au collisions.
Highlights
The left panel shows the dNch/dη distribution measured in the fiducial acceptance of the ATLAS detector, detecting particles with pT > 0.1 GeV
This paper presents a measurement of the centrality dependence of the charged-particle pseudorapidity distribution, dlisNiochn/sdaηt,amneuacslueroend–innuacplepornoxciemnatrtee-loyf1-mμabs−s 1enoefrpgy+oPf b√csoNlN= 5.02 TeV collected by the ATLAS detector at the LHC
The fully corrected measurements are presented for the fiducial acceptance of the ATLAS detector and in the full acceptance
Summary
C (2016) 76:199 particle multiplicity distributions as a function of pseudorapidity measured in central d + Au collisions are asymmetric and peaked in the Au-going direction [7] This observation has been explained using well-known phenomenology of soft hadron production [13]. Measurements of the centrality dependence of dNch/dη distributions in p + Pb collisions provide an essential test of soft hadron production mechanisms at the LHC Such tests have become of greater importance given the observation of two-particle [18,19,20,21] and multi-particle [21,22,23] correlations in the final state of p + Pb collisions at the LHC. That analysis compared different methods for characterising centrality and suggested that the method used to define centrality may have a significant impact on the centrality dependence of the measured dNch/dη distribution
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