Transverse-momentum fluctuations in relativistic heavy-ion collisions from event-by-event viscous hydrodynamics

2012/03/08 by Piotr Bozek, Piotr Bożek, Wojciech Broniowski +1 · 3 citations
Physics and Astronomy · #Cosmology and Gravitation Theories #Elliptic flow #Event (particle physics) #Glauber #Hadronization #Heavy ion #High-Energy Particle Collisions Research #Ion #Large Hadron Collider #Momentum (technical analysis) #Nuclear physics #Physics #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #Scattering #Statistical physics #Transverse plane #nucl-ex #nucl-th

paper · pdf · doi:10.1103/physrevc.85.044910

published as Phys. Rev. C 85, 044910 (2012) · 11 pages, 8 figures

arxiv created 2012/03/08 · openalex publication_date 2012/04/09 · arxiv updated 2012/04/26 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

We analyze event-by-event fluctuations of the transverse momentum in relativistic heavy-ion collisions at √s_NN=200 GeV in the framework based on the fluctuating Glauber-model initial conditions, event-by-event (3+1)-dimensional viscous hydrodynamics, and statistical hadronization. We use the scaled fluctuation measure \ensuremath⟨\ensuremathΔp_Ti\ensuremathΔp_Tj\ensuremath⟩/\ensuremath⟨\ensuremath⟨p_T\ensuremath⟩\ensuremath⟩. The identified ``geometric'' mechanism of generating the transverse-momentum fluctuations from the initial size fluctuations, transmitted to the final statistical-hadronization phase with hydrodynamics, is capable of easily reproducing the magnitude of the effect and explains the basic features of the data. On the other hand, it is somewhat too strong, hinting on modification of the popular Glauber approach to the earliest phase of the collision. We have checked that the considered measure is insensitive of the values of the shear and bulk viscosity coefficients, the freeze-out temperature, and the smoothing parameter for the initial distribution. It remains unaltered in the core-corona picture and is insensitive to the transverse-momentum conservation, approximately imposed in the statistical hadronization.

Citations

• Effect of shear viscosity on spectra, elliptic flow, and Hanbury Brown–Twiss radii
• NeXSPheRIO results on elliptic-flow fluctuations at RHIC
• Smoothed particle hydrodynamics for relativistic heavy-ion collisions
• Importance of Granular Structure in the Initial Conditions for the Elliptic Flow
• Elliptic flow in the Gaussian model of eccentricity fluctuations
• Geometric relation between centrality and the impact parameter in relativistic heavy-ion collisions
• Event-by-event hydrodynamics and elliptic flow from fluctuating initial states
• THERMINATOR: THERMal heavy-IoN generATOR
• Transverse momentum fluctuations due to temperature variation in high-energy nuclear collisions
• Universality of the transverse momentum distributions in the framework of percolation of strings
• Fluctuations around Bjorken flow and the onset of turbulent phenomena
• Fluctuating initial conditions in heavy ion collisions from the Glauber approach
• GLISSANDO: GLauber Initial-State Simulation AND mOre…

Cited by

• Disentangling the global multiplicity and spectral shape fluctuations in radial flow
• Vorticity and Polarization in Heavy-Ion Collisions: Hydrodynamic Models
• Probing the octupole deformation of ²³⁸U in high-energy nuclear collisions

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