Long- and short-range correlations and their event-scale dependence in high-multiplicity pp collisions at $\sqrt{\text{s}}=13$ TeV

Abstract

Two-particle angular correlations are measured in high-multiplicity proton-proton collisions at $\sqrt{s}=13$ TeV by the ALICE Collaboration. The yields of particle pairs at short-($\Delta \eta$ $\sim$ 0) and long-range ($1.6<|\Delta \eta |<1.8$) in pseudorapidity are extracted on the near-side ($\Delta \phi$ $\sim$ 0). They are reported as a function of transverse momentum ($p_{\mathrm{T}}$) in the range $1<p_{\mathrm{T}}<4$ GeV/$c$. Furthermore, the event-scale dependence is studied for the first time by requiring the presence of high-$p_{\mathrm{T}}$ leading particles and jets for varying $p_{\mathrm{T}}$ thresholds. The results demonstrate that the long-range "ridge" yield, possibly related to the collective behavior of the system, is present in events with high-$p_{\mathrm{T}}$ processes. The magnitudes of the short- and long-range yields are found to grow with the event scale. The results are compared to EPOS LHC and PYTHIA 8 calculations, with and without string-shoving interactions. It is found that while both models describe the qualitative trends in the data, calculations from EPOS LHC show a better quantitative agreement, in particular for the $p_{\mathrm{T}}$ and event-scale dependencies.

arXiv comment24 pages, 7 captioned figures, 1 table, authors from page 19, published version, figures at http://alice-publications.web.cern.ch/node/6759

References in corpus (65)

• The anti-k_t jet clustering algorithm
• FastJet user manual
• Experimental and Theoretical Challenges in the Search for the Quark Gluon Plasma: The STAR Collaboration's Critical Assessment of the Evidence from RHIC Collisions
• Formation of dense partonic matter in relativistic nucleus-nucleus collisions at RHIC: Experimental evaluation by the PHENIX collaboration
• Quark Gluon Plasma an Color Glass Condensate at RHIC? The perspective from the BRAHMS experiment
• The PHOBOS Perspective on Discoveries at RHIC
• Methods for analyzing anisotropic flow in relativistic nuclear collisions
• EPOS LHC : test of collective hadronization with LHC data
• Viscosity Information from Relativistic Nuclear Collisions: How Perfect is the Fluid Observed at RHIC?
• Performance of the ALICE Experiment at the CERN LHC
• Heavy Ion Collisions: The Big Picture, and the Big Questions
• Collision geometry fluctuations and triangular flow in heavy-ion collisions
• Long-range angular correlations on the near and away side in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV
• The ALICE TPC, a large 3-dimensional tracking device with fast readout for ultra-high multiplicity events
• Femtoscopy in Relativistic Heavy Ion Collisions: Two Decades of Progress
• Higher harmonic anisotropic flow measurements of charged particles in Pb-Pb collisions at 2.76 TeV
• Event-by-event anisotropic flow in heavy-ion collisions from combined Yang-Mills and viscous fluid dynamics
• Applying Bayesian parameter estimation to relativistic heavy-ion collisions: simultaneous characterization of the initial state and quark-gluon plasma medium
• Evidence for collectivity in pp collisions at the LHC
• Performance of the ALICE VZERO system
• Alignment of the ALICE Inner Tracking System with cosmic-ray tracks
• Triangular flow in hydrodynamics and transport theory
• Event-by-event fluctuations in perturbative QCD + saturation + hydro model: pinning down QCD matter shear viscosity in ultrarelativistic heavy-ion collisions
• Observation of long-range elliptic anisotropies in $\sqrt{s}=$13 and 2.76 TeV $pp$ collisions with the ATLAS detector
• Measurement of the pseudorapidity and transverse momentum dependence of the elliptic flow of charged particles in lead-lead collisions at sqrt(s_NN) = 2.76 TeV with the ATLAS detector
• Creating small circular, elliptical, and triangular droplets of quark-gluon plasma
• Small System Collectivity in Relativistic Hadron and Nuclear Collisions
• Initial state geometry and the role of hydrodynamics in proton-proton, proton-nucleus and deuteron-nucleus collisions
• One fluid to rule them all: viscous hydrodynamic description of event-by-event central p+p, p+Pb and Pb+Pb collisions at $\sqrt{s}=5.02$ TeV
• Charged-particle nuclear modification factors in PbPb and pPb collisions at sqrt(s[NN]) = 5.02 TeV
• Anisotropic flow of charged hadrons, pions and (anti-)protons measured at high transverse momentum in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV
• Measurement of long-range near-side two-particle angular correlations in pp collisions at sqrt(s) = 13 TeV
• Elliptic flow of identified hadrons in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV
• Correlated event-by-event fluctuations of flow harmonics in Pb-Pb collisions at $\sqrt{s_{{}_{\mathrm{NN}}}}=2.76$ TeV
• Measurement of jet suppression in central Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV
• Running the gamut of high energy nuclear collisions
• Imprints of fluctuating proton shapes on flow in proton-lead collisions at the LHC
• Multiplicity dependence of charged pion, kaon, and (anti)proton production at large transverse momentum in p-Pb collisions at $\sqrt{{\text{s}}_{\mathrm{NN}}}$ = 5.02 TeV
• Evidence for BFKL and saturation dynamics from di-hadron spectra at the LHC
• Measurement of the Underlying Event Activity at the LHC with sqrt(s)= 7 TeV and Comparison with sqrt(s) = 0.9 TeV
• Investigations of anisotropic flow using multi-particle azimuthal correlations in pp, p-Pb, Xe-Xe, and Pb-Pb collisions at the LHC
• Collectivity without plasma in hadronic collisions
• Experimental overview on small collision systems at the LHC
• Decomposition of Harmonic and Jet Contributions to Particle-pair Correlations at Ultra-relativistic Energies
• Measurements of long-range azimuthal anisotropies and associated Fourier coefficients for $pp$ collisions at $\sqrt{s}=5.02$ and $13$ TeV and $p$+Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV with the ATLAS detector
• Hydrodynamic Collectivity in Proton--Proton Collisions at 13 TeV
• Transverse nucleon structure and diagnostics of hard parton-parton processes at LHC
• Hybrid Color Glass Condensate and hydrodynamic description of the Relativistic Heavy Ion Collider small system scan
• Constraints on jet quenching in p-Pb collisions at $\sqrt{{\mathbf{s}}_{\mathbf{NN}}}$ = 5.02 TeV measured by the event-activity dependence of semi-inclusive hadron-jet distributions
• Measurement of the Underlying Event Activity in Proton-Proton Collisions at 0.9 TeV
• Linear and non-linear flow mode in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=$ 2.76 TeV
• Measurements of multiparticle correlations in $d$$+$Au collisions at 200, 62.4, 39, and 19.6 GeV and $p$$+$Au collisions at 200 GeV and implications for collective behavior
• Importance of initial and final state effects for azimuthal correlations in p+Pb collisions
• Relativistic Fluid Dynamics In and Out of Equilibrium -- Ten Years of Progress in Theory and Numerical Simulations of Nuclear Collisions
• Centrality dependence of charged jet production in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV
• Systematic studies of correlations between different order flow harmonics in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV
• Higher harmonic non-linear flow modes of charged hadrons in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV
• Small system studies: A theory overview
• Charged jet cross section and fragmentation in proton-proton collisions at $\sqrt{s}$ = 7 TeV
• Measurement of the underlying event activity in pp collisions at sqrt(s) = 0.9 and 7 TeV with the novel jet-area/median approach
• Soft modifications to jet fragmentation in high energy proton-proton collisions
• Pseudorapidity dependence of long-range two-particle correlations in pPb collisions at sqrt(s[NN]) = 5.02 TeV
• Anomalous evolution of the near-side jet peak shape in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV
• Measurement of long-range two-particle azimuthal correlations in $Z$-boson tagged $pp$ collisions at $\sqrt{s}=8$ and 13 TeV
• CMS ridge effect at LHC as a manifestation of bremstralung of gluons due to the quark-anti-quark string formation

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• K${}_{\mathrm{S}}^0$- and (anti-)$\Lambda$-hadron correlations in pp collisions at $\sqrt{s}=13$ TeV
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