Gluon saturation inpAcollisions at energies available at the CERN Large Hadron Collider: Predictions for hadron multiplicities

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The upcoming $p+\text{Pb}$ run at the Large Hadron Collider (LHC) will probe the nuclear gluon distribution at very small Bjorken $x$ (from $x\ensuremath{\sim}{10}^{\ensuremath{-}4}$ at midrapidity down to $x\ensuremath{\sim}{10}^{\ensuremath{-}6}$ in the proton fragmentation region) and will allow testing of approaches based on parton saturation. Here, we present the predictions of the Kharzeev-Levin-Nardi model for hadron multiplicities and multiplicity distributions in $p+\text{Pb}$ collisions at a center-of-mass energy of 4.4 TeV. We also compare the model to the existing $pp$, $dA$, and $AA$ data from the Relativistic Heavy Ion Collider and LHC.