Eccentric protons? Sensitivity of flow to system size and shape in p+p, p+Pb and Pb+Pb collisions

Abstract

We determine the transverse system size of the initial non-equilibrium Glasma state and of the hydrodynamically evolving fireball as a function of produced charged particles in p+p, p+Pb and Pb+Pb collisions at the Large Hadron Collider. Our results are consistent with recent measurements of Hanbury-Brown-Twiss (HBT) radii by the ALICE collaboration. Azimuthal anisotropy coefficients v_n generated by combining the early time Glasma dynamics with viscous fluid dynamics in Pb+Pb collisions are in excellent agreement with experimental data for a wide range of centralities. In particular, event-by-event distributions of the v_n agree with the experimental data out to fairly peripheral centrality bins. In striking contrast, our results for p+Pb collisions significantly underestimate the magnitude and do not reproduce the centrality dependence of data for v_2 and v_3 coefficients. We argue that the measured v_n data and HBT radii strongly constrain the shapes of initial parton distributions across system sizes that would be compatible with a flow interpretation in p+Pb collisions. Alternately, additional sources of correlations may be required to describe the systematics of long range rapidity correlations in p+p and p+Pb collisions.

arXiv comment5 pages, 5 figures

References in corpus (38)

• The Color Glass Condensate
• Elliptic and triangular flow in event-by-event (3+1)D viscous hydrodynamics
• Long-range angular correlations on the near and away side in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV
• Observation of long-range near-side angular correlations in proton-lead collisions at the LHC
• Hydrodynamic Modeling of Heavy-Ion Collisions
• Fluctuating Glasma initial conditions and flow in heavy ion collisions
• Event-by-event anisotropic flow in heavy-ion collisions from combined Yang-Mills and viscous fluid dynamics
• 3+1D hydrodynamic simulation of relativistic heavy-ion collisions
• Observation of Associated Near-side and Away-side Long-range Correlations in sqrt(s_NN)=5.02 TeV Proton-lead Collisions with the ATLAS Detector
• Multiplicity and transverse-momentum dependence of two- and four-particle correlations in pPb and PbPb collisions
• Event-by-event gluon multiplicity, energy density and eccentricities at RHIC and LHC
• Quadrupole Anisotropy in Dihadron Azimuthal Correlations in Central $d$$+$Au Collisions at $\sqrt{s_{{}_{NN}}}$=200 GeV
• Comparison of the Color Glass Condensate to di-hadron correlations in proton-proton and proton-nucleus collisions
• The ridge in proton-proton collisions at the LHC
• Event-by-event distributions of azimuthal asymmetries in ultrarelativistic heavy-ion collisions
• Collective flow in p-Pb and d-Pb collisions at TeV energies
• Higher flow harmonics from (3+1)D event-by-event viscous hydrodynamics
• Initial state geometry and the role of hydrodynamics in proton-proton, proton-nucleus and deuteron-nucleus collisions
• Analysis of combined HERA data in the Impact-Parameter dependent Saturation model
• Color reconnection and flow-like patterns in pp collisions
• Collective dynamics of the high-energy proton-nucleus collisions
• Measurement of the distributions of event-by-event flow harmonics in lead--lead collisions at sqrt(s_NN)=2.76 TeV with the ATLAS detector at the LHC
• Analysing radial flow features in p-Pb and p-p collisions at several TeV by studying identified particle production in EPOS3
• Azimuthal collimation of long range rapidity correlations by strong color fields in high multiplicity hadron-hadron collisions
• Correlations from hydrodynamic flow in p-Pb collisions
• Long range two-particle rapidity correlations in A+A collisions from high energy QCD evolution
• Explanation of systematics of CMS p+Pb high multiplicity di-hadron data at ${\sqrt{s}}_{\mathrm{NN}}=5.02$ TeV
• Evidence for BFKL and saturation dynamics from di-hadron spectra at the LHC
• Evidence for flow in pPb collisions at 5 TeV from v2 mass splitting
• Mass hierarchy in identified particle distributions in proton-lead collisions
• The Fate of the Initial State Fluctuations in Heavy Ion Collisions. II The Fluctuations and Sounds
• High energy factorization in nucleus-nucleus collisions III. Long range rapidity correlations
• The Fate of the Initial State Fluctuations in Heavy Ion Collisions. III The Second Act of Hydrodynamics
• Multiplicity distributions in p+p, p+A and A+A collisions from Yang-Mills dynamics
• Possible multiparticle ridge-like correlations in very high multiplicity proton-proton collisions
• Size of the emission source and collectivity in ultra-relativistic p-Pb collisions
• Constraints from $v_2$ fluctuations for the initial state geometry of heavy-ion collisions
• Non-Spherical Shapes of the Proton: Existence, Measurement and Computation

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