# Pseudorapidity distributions of charged hadrons in proton-lead collisions at $\sqrt {^s{NN}}$= 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 $|ηlab| < 2.4$. 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 $|ηcm| < 0.5$, the average charged-hadron multiplicity densities 〈$dN_{ch}/dη_ {cm} |ηcm| < 0.5 are 17.31 ± 0.01 (stat) ± 0.59 (syst)$ and $20.10 ± 0.01 (stat) ± 0.85(syst)$ at $\sqrt {^s{NN}} = 5.02 and 8.16 TeV$, respectively. The particle densities per participant nucleon are compared to similar measurements in proton-proton, proton-nucleus, and nucleus-nucleus collisions.

## 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 $|ηlab| < 2.4$. 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 $|ηcm| < 0.5$, the average charged-hadron multiplicity densities 〈$dN_{ch}/dη_ {cm} |ηcm| < 0.5 are 17.31 ± 0.01 (stat) ± 0.59 (syst)$ and $20.10 ± 0.01 (stat) ± 0.85(syst)$ at $\sqrt {^s{NN}} = 5.02 and 8.16 TeV$, respectively. The particle densities per participant nucleon are compared to similar measurements in proton-proton, proton-nucleus, and nucleus-nucleus collisions.

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