Pseudorapidity Density of Charged Particles in p+Pb Collisions at √sNN=5.02  TeV

Lee Stuart Barnby, David Evans, Luke Hanratty, Peter Jones, Anton Jusko, Ravjeet Kour, Marian Krivda, Graham Lee, Roman Lietava, Zoe Matthews, Sparsh Navin, Arvinder Palaha, Plamen Petrov, Patrick Scott, Orlando Villalobos Baillie

Research output: Contribution to journalArticlepeer-review

155 Citations (Scopus)


The charged-particle pseudorapidity density measured over four units of pseudorapidity in nonsingle-diffractive p+Pb collisions at a center-of-mass energy per nucleon pair √sNN=5.02  TeV is presented. The average value at midrapidity is measured to be 16.81±0.71  (syst), which corresponds to 2.14±0.17  (syst) per participating nucleon, calculated with the Glauber model. This is 16% lower than in nonsingle-diffractive pp collisions interpolated to the same collision energy and 84% higher than in d+Au collisions at √sNN=0.2  TeV. The measured pseudorapidity density in p+Pb collisions is compared to model predictions and provides new constraints on the description of particle production in high-energy nuclear collisions.

Original languageEnglish
Article number032301
Number of pages10
JournalPhysical Review Letters
Issue number3
Publication statusPublished - 18 Jan 2013

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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