Pseudorapidity distributions of charged hadrons in proton-lead collisions at $\sqrt{s_{{}_{\mathrm{NN}}}}=$ 5.02 and 8.16 TeV

Abstract

The pseudorapidity distributions of charged hadrons in proton-lead collisions at nucleon-nucleon center-of-mass energies $\sqrt{s_{{}_{\mathrm{NN}}}}=$ 5.02 and 8.16 TeV are presented. The measurements are based on data samples collected by the CMS experiment at the LHC. The number of primary charged hadrons produced in non-single-diffractive proton-lead collisions is determined in the pseudorapidity range $|{\eta }_{\mathrm{lab}}|<$ 2.4. The charged-hadron multiplicity distributions are compared to the predictions from theoretical calculations and Monte Carlo event generators. In the center-of-mass pseudorapidity range $|{\eta }_{\mathrm{cm}}|<0.5$, the average charged-hadron multiplicity densities $<\mathrm{d}{N}_{\mathrm{ch}}/\mathrm{d}{\eta }_{\mathrm{cm}}>$${|}_{|{\eta }_{\mathrm{cm}}|<0.5}$ are 17.31 $\pm$ 0.01 (stat) $\pm$ 0.59 (syst) and 20.10 $\pm$ 0.01 (stat) $\pm$ 0.85 (syst) at $\sqrt{s_{{}_{\mathrm{NN}}}}=$ 5.02 and 8.16 TeV, respectively. The particle densities per participant nucleon are compared to similar measurements in proton-proton, proton-nucleus, and nucleus-nucleus collisions.

Replaced with the published version. Added the journal reference and the DOI. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/HIN-16-021 (CMS Public Pages)

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