Heavy-ion collisions at the Large Hadron Collider: a review of the results from Run 1

Abstract

We present an overview of the results obtained in pPb and PbPb collisions at the Large Hadron Collider during Run 1. We first discuss the results for global characteristics: cross sections, hadron multiplicities, azimuthal asymmetries, correlations at low transverse momentum, hadrochemistry, and femtoscopy. We then review hard and electromagnetic probes: particles with high transverse momentum, jets, heavy quarks, quarkonium, electroweak bosons and high transverse momentum photons, low transverse momentum photons and dileptons, and ultraperipheral collisions. We mainly focus on the experimental results, and present very briefly the main current theoretical explanations.

33 pages, 29 figures

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• EPS09 - a New Generation of NLO and LO Nuclear Parton Distribution Functions
• Observation of long-range near-side angular correlations in proton-lead collisions at the LHC
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• Observation of $D^0$ meson nuclear modifications in Au+Au collisions at $\sqrt{s_{{}_{\mathrm{NN}}}}$ = 200 GeV
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• Measurement of jet fragmentation into charged particles in pp and PbPb collisions at sqrt(s[NN]) = 2.76 TeV
• Azimuthal anisotropy of D meson production in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV
• Angular Correlations in Gluon Production at High Energy
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• Azimuthal asymmetries and the emergence of "collectivity" from multi-particle correlations in high-energy pA collisions
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• Production of inclusive ${\rm Y}$(1S) and ${\rm Y}$(2S) in p-Pb collisions at $\sqrt{{\mathbf{s}}_{\mathrm{NN}}}=5.02$ TeV
• Jet hadrochemistry as a characteristics of jet quenching
• Nuclear effects on the transverse momentum spectra of charged particles in pPb collisions at a nucleon-nucleon center-of-mass energy of 5.02 TeV
• RHIC and LHC jet suppression in non-central collisions
• Measurement of visible cross sections in proton-lead collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV in van der Meer scans with the ALICE detector
• Jet quenching pattern at LHC in PYQUEN model
• Freeze-out radii extracted from three-pion cumulants in pp, p-Pb and Pb-Pb collisions at the LHC
• Study of ${\rm Y}$ production and cold nuclear matter effects in pPb collisions at $\sqrt{s_{NN}}=5\mathrm{TeV}$
• Measurement of prompt psi(2S) to J/psi yield ratios in PbPb and pp collisions at sqrt(s[NN]) = 2.76 TeV
• Study of Z production in PbPb and pp collisions at sqrt(s[NN]) = 2.76 TeV in the dimuon and dielectron decay channels
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• Size of the emission source and collectivity in ultra-relativistic p-Pb collisions
• Multiplicity dependence of jet-like two-particle correlations in p-Pb collisions at $\sqrt{s_{NN}}$ = 5.02 TeV
• Pion, kaon, and proton femtoscopy in Pb--Pb collisions at $\sqrt{s_{\mathrm{NN}}}$=2.76 TeV modeled in 3+1D hydrodynamics
• Charged particle (pseudo-)rapidity distributions in proton+anti-proton/proton+proton and Pb+Pb/Au+Au collisions from SPS to LHC energies from UrQMD
• Femtoscopy correlations of kaons in $Pb+Pb$ collisions at LHC within hydrokinetic model
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• Fluctuations and asymmetric jet events in PbPb collisions at the LHC
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• Azimuthal Anisotropy: Ridges, Recombination and Breaking of Quark Number Scaling
• Onset of the ridge structure in AA, pA and pp collisions
• Calculation of centrality bias factors in $p$+A collisions based on a positive correlation of hard process yields with underlying event activity
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• Kinematic biases on centrality selection of jet events in pPb collisions at the LHC
• Low-Mass Dielectron Production in pp, p-Pb and Pb-Pb Collisions with ALICE

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• QM2017: Status and Key open Questions in Ultra-Relativistic Heavy-Ion Physics
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• Measurement of prompt ${\mathrm{D}}^0$ and ${\overline{\mathrm{D}}}^0$ meson azimuthal asymmetry and search for strong electric fields in PbPb collisions at $\sqrt{s_{\mathrm{NN}}}=$ 5.02 TeV
• An overview of experimental results from ultra-relativistic heavy-ion collisions at the CERN LHC: hard probes
• Inverse Magnetic/Shear Catalysis
• Underlying Event properties in pp collisions at $\sqrt{s}$ = 13 TeV
• Precise description of medium-induced emissions
• From soft to hard radiation: the role of multiple scatterings in medium-induced gluon emissions
• A unified picture of medium-induced radiation
• Initial-state energy loss in cold QCD matter and the Drell-Yan process
• Isolating perturbative QCD splittings in heavy-ion collisions
• Parton energy loss in a hard-soft factorized approach
• String percolation threshold for elliptically bounded systems
• Charmed meson and charmonium production in PbPb collisions at the LHC
• Probing charm quark dynamics via multiparticle correlations in PbPb collisions at $\sqrt{s_{\mathrm{NN}}}=$ 5.02 TeV
• Nuclear $p_{\perp }$-broadening of Drell-Yan and quarkonium production from SPS to LHC
• Thermal dynamics on the lattice with exponentially improved accuracy
• AMY Lorentz invariant parton cascade -- the thermal equilibrium case
• Production and hadronic decays of Higgs bosons in heavy ion collisions
• Bayesian Constraints on Pre-Equilibrium Jet Quenching and Predictions for Oxygen Collisions
• Multiplicity and transverse momentum dependence of charge-balance functions in pPb and PbPb collisions at LHC energies
• INFN What Next: Ultra-relativistic Heavy-Ion Collisions
• Perspectives in Small Systems : Heavy Quarks and HBT Radii
• Field Theories Without a Holographic Dual
• The Drell-Yan nuclear modification due to the nuclear effects of nPDFs and initial-state parton energy loss
• Exploring sQGP and Small Systems
• On The Existence of a Holographic Description of the LHC Quark-Gluon Plasmas
• Baryon number transfer could delay Quark-Hadron transition in cosmology
• Semi-Inclusive Jet Functions and Jet Substructure in $J_{E_T}^{(I)}$ and $J_{E_T}^{(II)}$ Algorithms
• Light flavor results in p-Pb collisions with ALICE
• The study of the incoming parton energy loss effect on the NLO nuclear Drell-Yan ratios
• Parton energy loss in QCD matter
• Deriving a parton shower for jet thermalization in QCD plasmas
• Interactions of the deuteron with a hadronic medium
• Implications of correlations and fluctuations in small systems