Observation of long-range near-side angular correlations in proton-lead collisions at the LHC

Abstract

Results on two-particle angular correlations for charged particles emitted in pPb collisions at a nucleon-nucleon center-of-mass energy of 5.02 TeV are presented. The analysis uses two million collisions collected with the CMS detector at the LHC. The correlations are studied over a broad range of pseudorapidity, eta, and full azimuth, phi, as a function of charged particle multiplicity and particle transverse momentum, pt. In high-multiplicity events, a long-range (2 < abs(Delta(eta)) < 4), near-side (Delta(phi) approximately 0) structure emerges in the two-particle Delta(eta)-Delta(phi) correlation functions. This is the first observation of such correlations in proton-nucleus collisions, resembling the ridge-like correlations seen in high-multiplicity pp collisions at sqrt(s) = 7 TeV and in AA collisions over a broad range of center-of-mass energies. The correlation strength exhibits a pronounced maximum in the range of pt = 1-1.5 GeV and an approximately linear increase with charged particle multiplicity for high-multiplicity events. These observations are qualitatively similar to those in pp collisions when selecting the same observed particle multiplicity, while the overall strength of the correlations is significantly larger in pPb collisions.

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• Relics of Minijets amid Anisotropic Flows in High-energy Heavy-ion Collisions
• Single string structure and multiple string interaction effect on strange particle production in pp collisions at $\sqrt{s}=7$ TeV
• On the origin of long-range azimuthal correlations in hadronic collisions
• Exploring the properties of the phases of QCD matter - research opportunities and priorities for the next decade
• DPS in CGC: HBT correlations in double inclusive photon production
• Ratios of jet and hadron spectra at LHC energies: measuring high-$p_T$ suppression without a $pp$ reference
• Production of $\Lambda$ and ${\mathrm{K}}_{\mathrm{S}}^0$ in jets in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV and pp collisions at $\sqrt{s}=7$ TeV
• Energy loss as the origin of an universal scaling law of the elliptic flow
• Measurement of emission angle anisotropy via long-range angular correlations with high $p_T$ hadrons in $d$$+$Au and $p$$+$$p$ collisions at $\sqrt{s_{{}_{NN}}}=200$ GeV
• Initial state and pre-equilibrium effects in small systems
• Highlights from BNL-RHIC 2011-2013
• First results from p-Pb collisions at the LHC
• Elliptic flow in ultra-relativistic collisions with light polarized nuclei
• Effect of radial flow on two particle correlations with identified triggers at intermediate $p_T$ in p-Pb collisions at $\sqrt{s_{NN}}=$ 5.02 TeV
• Implication of two-baryon azimuthal correlations in $pp$ collisions at LHC energies on the QGP
• Hadronization Scheme Dependence of Long-Range Azimuthal Harmonics in High Energy p+A Reactions
• Hydrodynamic approach to p-Pb
• Nonperturbative transverse momentum broadening in dihadron angular correlations in $\sqrt{s_{NN}}=200$ GeV proton-nucleus collisions
• Measurement of Two-Particle Correlations of Hadrons in $e^{+}{e}^{-}$ Collisions at Belle
• The effect of the fluctuating proton size on the study of chiral magnetic effect in proton-nucleus collisions
• Review of nonflow estimation methods and uncertainties in relativistic heavy-ion collisions
• Streched String with Self-Interaction at the Hagedorn Point: Spatial Sizes and Black Hole
• A CGC/saturation approach for angular correlations in proton-proton scattering
• Observation of $\Lambda$ hyperon local polarization in pPb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 8.16 TeV
• Machine learning study to identify collective flow in small and large colliding systems
• Measurements of azimuthal anisotropies at forward and backward rapidity with muons in high-multiplicity p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=8.16$ TeV
• Initial-State Bremsstrahlung versus Final-State Hydrodynamic Sources of Azimuthal Harmonics in p+A at RHIC and LHC
• Bose-Einstein correlations in perturbative QCD: $v_n$ dependence on multiplicity
• Plane correlations in small colliding systems
• Exploring Potential Signatures of QGP in UHECR Ground Profiles
• Angular correlations measured in pp collisions by ALICE at the LHC
• Production and anisotropic flow of thermal photons in collision of $\alpha$-clustered carbon with heavy nuclei at relativistic energies
• Model study on ${\rm Y}(nS)$ modification in small collision systems
• Bose-Einstein correlations and ${\mathbf{v}}_{2n}$ and ${\mathbf{v}}_{2n-1}$ in hadron and nucleus collisions
• Initial conditions of bulk matter in ultrarelativistic nuclear collisions
• Study of azimuthal anisotropy of ${\rm Y}$(1S) mesons in pPb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 8.16 TeV
• Parton collisional effect on the conversion of geometry eccentricities into momentum anisotropies in relativistic heavy-ion collisions
• Evidence for similar collectivity of high transverse momentum particles in pPb and PbPb collisions
• Thermalization of the world's smallest fluids: recent developments
• Anomalous features of particle production in high-multiplicity events of pp collisions at the LHC energies
• Collective flow and hydrodynamics in large and small systems at the LHC
• Small systems at the LHC
• Azimuthal instabilities of the Gribov-Levin-Ryskin equation
• Long Range Azimuthal Correlations of Multiple Gluons in Gluon Saturation Limit
• Event mixing does not reproduce single particle acceptance convolutions for nonuniform pseudorapidity distributions
• A Study of the Di-Hadron Angular Correlation Function in Event by Event Ideal Hydrodynamics
• Production of $\eta$ and ${\eta }^{\prime }$ mesons in $pp$ and $p$Pb collisions
• Universal geometrical scaling of the elliptic flow
• Bayesian Constraints on Pre-Equilibrium Jet Quenching and Predictions for Oxygen Collisions
• Particle production as a function of charged-particle flattenicity in pp collisions at $\sqrt{s}$ = 13 TeV
• Observation of suppressed charged-particle production in ultrarelativistic oxygen-oxygen collisions
• Understanding long-range near-side ridge correlations in p$-$p collisions using rope hadronization at LHC energies
• Correction methods for finite-acceptance effects in two-particle correlation analyses
• Saturation scale fluctuations and multi-particle rapidity correlations
• Experimental Results on p(d)+A Collisions at RHIC and the LHC
• Role of clustered nuclear geometry in particle production through p-C and p-O collisions at the Large Hadron Collider
• Collective flow in small systems
• Collective behavior in small systems
• Signals of quark combination at hadronization in $pp$ collisions at $\sqrt{s}=200$ GeV
• p-Pb Results from ALICE with an Emphasis on Centrality Determination
• Centrality dependent long-range angular correlations of intermediate-pT D-mesons and charged particles in pPb collisions at the LHC energy
• INFN What Next: Ultra-relativistic Heavy-Ion Collisions
• Two-gluon rapidity correlations of strong colour field in $pp$, $pA$ and $AA$ collisions
• Forward-backward multiplicity and momentum correlations in pp and pPb collisions at the LHC energies
• Strange particle production in jets and underlying events in pp collisions at $\sqrt{s}=7$ TeV with PYTHIA8 generator
• Investigating the role of partonic and hadronic dynamics in mass splitting of elliptic anisotropy in p-Pb collisions at $\sqrt{s_{NN}}$ = 5.02 TeV
• Probing the profile of bulk matter in p+Pb collisions via directed flow of heavy quarks
• Observation of long-range collective flow in OO and NeNe collisions and implications for nuclear structure studies
• An overview of new measurements of flow, chirality, and vorticity from STAR experiment
• Azimuthal angle correlations at large rapidities: revisiting density variation mechanism
• Elliptic anisotropy measurement of the f${}_0$(980) hadron in proton-lead collisions and evidence for its quark-antiquark composition
• PHENIX Overview
• Event characterization in (very) asymmetric collisions
• Elliptic and triangular flows in dAu collisions at 200 GeV in the fusing color string model
• Ridge from jet-medium interaction in p-Pb collisions at $\sqrt{s_{NN}}$ = 5.02 TeV
• Two-particle correlations in azimuthal angle and pseudorapidity in central ${}^7$Be+${}^9$Be collisions at the CERN Super Proton Synchrotron
• Search for nuclear modifications of B${}^{+}$ meson production in pPb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 8.16 TeV
• Charged-particle multiplicity distributions over a wide pseudorapidity range in p-Pb collisions at ${\sqrt{\mathbf{s}}}_{\mathrm{NN}}=5.02$ TeV
• What does the matter created in high multiplicity proton-nucleus collisions teach us about the 3-D structure of the proton?
• Jet Quenching and Correlations
• New results on jets and heavy flavor in heavy-ion collisions with ALICE
• Fine structures of azimuthal correlations of two gluons in the glasma
• Multiplicity dependent $p_T$ distributions of identified particles in pp collisions at 7 TeV within HIJING/$B\bar{B}$ v2.0 model
• Bulk quantities in nuclear collisions from running coupling $k_T$-factorization and hybrid simulations
• Momentum-kick model application to high multiplicity pp collisions at $\sqrt{s}=13\mathrm{TeV}$ at the LHC
• Review of results using heavy ion collisions at CMS
• Testing the collectivity in large and small colliding systems with test particles
• Exploring sQGP and Small Systems
• Inclusive photon production at forward rapidities in pp and p$-$Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV
• Multiplicity dependence of charged-particle intra-jet properties in pp collisions at $\sqrt{s}$ = 13 TeV
• Viscosity of non equilibrium hot $\&$ dense QCD drop formed at LHC
• Symmetric cumulant $s{c}_{2,4}\left\{4\right\}$ and asymmetric cumulant $a{c}_2\left\{3\right\}$ from transverse momentum conservation and flow
• Measurements of differential two-particle number and transverse momentum correlation functions in pp collisions at $\sqrt{\text{s}}$ = 13 TeV
• Effect of $\alpha$-clusters on particle production in O$-$O and p$-$O collisions at LHC energies
• Investigating nonflow contribution subtraction in d-Au collisions with AMPT model
• Mapping the internal structure of hadrons through color and spin effects
• Two-particle correlations in p-Pb collisions at the LHC with ALICE
• Cumulant Expansion in Gluon Saturation, and Five and Six-Gluon Azimuthal Correlations
• Azimuthal flow in hadron collisions from quark-gluon string repulsion
• Dihadron correlations in d+Au collisions from STAR
• Azimuthal angle correlations in hadron-nucleus scattering: enhanced diagrams
• Multiple Parton Interactions with ALICE: from pp to p-Pb
• Multiplicity fluctuation from hydrodynamic noise
• Study of collective flows of protons and ${\pi }^{-}$ -mesons in p(C, Ta) and He(Li, C) collisions at momenta of 4.2, 4.5 and 10 AGeV/c
• LHC: Past, Present, and Future
• Hydrodynamic models of particle production
• Azimuthal Correlation Anisotropies in p + p Collisions Simulated by Pythia
• Evolution of the hot dense matter at LHC energies through light and heavy-flavor hadrons using non-extensive thermodynamics
• Multiplicity dependence of charm baryon and charm meson production in pPb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 8.16 TeV
• Investigating $\Lambda$ baryon production in p-Pb collisions in jets and the underlying event using angular correlations
• Exploring hidden sectors with two-particle angular correlations at future $e^{+}{e}^{-}$ colliders
• Squeezed back-to-back correlations of $K^{+}$$K^{-}$ in d+Au collisions at $\sqrt{s_{NN}}=200$ GeV and Au+Au collisions at $\sqrt{s_{NN}}=62.4$ GeV
• Two Gluon Emission from MHV: Two Particle Correlations and the Deviation from Poisson
• Recent results on two-particle correlations in ALICE
• Structure of the medium formed in heavy ion collisions
• Two-Particle Correlations in Heavy-Light Ion Collisions
• Fluctuations in ultra-relativistic heavy ion collisions
• $D^0$-Meson $R_{AA}$ in PbPb Collisions at $\sqrt{s_{NN}}$ = 5.02 TeV and Elliptic Flow in pPb Collisions at $\sqrt{s_{NN}}$ = 8.16 TeV with CMS
• Dihadron azimuthal correlations at large pseudo-rapidity difference in multiplicity-selected d+Au collisions by STAR
• Large-rapidity ridge correlations from Color Glass Condensate
• Systematic study of high $p_{\mathrm{T}}$ hadron production in small collision systems by the PHENIX experiment at RHIC
• Rapidity window dependence of ridge correlations in the glasma
• Identified Particle Production in p-Pb Collisions Measured with the ALICE Detector
• Production of strange hadrons in jets and underlying events in pp and p-Pb collisions with ALICE
• Theory Summary
• Forward-central two-particle correlations in p--Pb collisions with ALICE at the LHC
• Constraints on string percolation model from anomalous centrality evolution data in Au-Au collisions at $\sqrt{{\mathbf{s}}_{\mathbf{NN}}}=$ 62 and 200 GeV
• Examining the event-shape dependent modifications to charged-particle transverse momentum spectra and elliptic flow in p-Pb collisions at energies available at the CERN Large Hadron Collider
• Review of recent results on heavy-ion physics and astroparticle physics in ALICE at the LHC
• Impact of soft QCD effects over intrajet azimuthal anisotropies
• Long-range correlations in proton-lead collisions at sqrt{s_NN} = 5.02 TeV from ATLAS
• Energy independent scaling of ridge and final state description of high multiplicity p+p collisions at $\sqrt{s}$ = 7 and 13 TeV
• Ridges in p-A (and pp) collisions
• Implications of correlations and fluctuations in small systems
• Transverse Momentum Distributions of Identified Particles in p-Pb Collisions at $\sqrt{{\mathrm{s}}_{\mathrm{NN}}}=5.02\mathrm{TeV}$
• Longitudinal Dynamics of Large and Small Systems from a 3D Bayesian Calibration of RHIC Top-energy Collision Data
• Correlations, multiplicity distributions, and the ridge in pp and p-Pb collisions
• Finite $V_{2\Delta }$ puzzle in low-multiplicity pp collisions from ultra-long-range azimuthal correlations in the string-shoving model
• Long-range angular correlations by strong color fields in hadronic collisions
• Flow coefficients in O-O Al-Al and Cu-Cu collisions at 200 GeV in the fusing color string model
• Multiplicity dependence of ${\rm Y}$(nS) mean transverse momentum in proton-proton collisions
• Elliptic flow of charged hadrons in d+Au collisions at $\sqrt{s_{NN}}=$ 200 GeV using a multi-phase transport model
• Analysis of the near-side ridge structure in pp collisions via Momentum-Kick Model
• Collective phenomena in high-energy nuclear collisions
• Charge asymmetry dependence of anisotropic flow in pPb and PbPb collisions with CMS experiment
• Event-Shape Engineering and Muon-Hadron Correlations with ALICE
• Nonperturbative factorization breaking and color entanglement effects in dihadron and direct photon-hadron angular correlations in $p$$+$$p$ and $p$$+$A collisions
• Anisotropic flow in pp-collisions at the LHC
• Study of azimuthal correlations between D mesons and charged particles with the ALICE experiment
• Femtoscopic measurements in $p$+Pb collisions at $\sqrt{s_{{}_{\text{NN}}}}=5.02$~TeV with ATLAS at the LHC
• Partonic transport model application to heavy flavor
• Shadowing in multiparton proton - deuteron collisions