Characterizing radial flow fluctuations in relativistic heavy-ion collisions at top RHIC and LHC energies

2025/08/10 by Du, Lipei · 3 citations
#FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph)

paper · doi:10.48550/arxiv.2508.07184

Abstract

We present a systematic investigation of the transverse-momentum differential radial flow fluctuations observable v₀(p_T) in relativistic heavy-ion collisions at top RHIC (√(s_NN) = 200 GeV) and LHC (√(s_NN) = 2.76 and 5.02 TeV) energies. Using a multistage hydrodynamic model, we assess the sensitivity of v₀(p_T) to a wide range of physical effects, including bulk and shear viscosities, off-equilibrium corrections at particlization, the presence of a hadronic afterburner, and the nucleon size in the initial conditions. By employing complementary rescaling strategies, we demonstrate how different physical effects leave distinct imprints on the shape of v₀(p_T). A combined double-rescaling of v₀(p_T)/v₀ versus p_T/⟨ p_T ⟩ reveals a universality across a wide range of energies and model assumptions in the low-p_T regime, a robust signature of collective behavior. This allows us to disentangle the universal dynamics of the bulk medium from model-specific features that emerge at higher p_T. Our results establish v₀(p_T) as a powerful and complementary observable for constraining QGP transport properties and initial-state granularity, offering a unique probe of the created QCD medium.

Citations

• Understanding radial flow fluctuations through event-by-event momentum rescaling
• Bayesian Model Selection and Uncertainty Propagation for Beam Energy Scan Heavy-Ion Collisions
• Electromagnetic tomography of radial flow in the quark-gluon plasma
• Disentangling the global multiplicity and spectral shape fluctuations in radial flow
• Long-range transverse momentum correlations and radial flow in Pb-Pb collisions at the LHC with ALICE
• Evidence for the collective nature of radial flow in Pb+Pb collisions with the ATLAS detector
• A Gaussian Process Generative Model for QCD Equation of State
• Particlization in fluid dynamical simulations of heavy-ion collisions:\n The iS3D module
• The JETSCAPE framework
• Equation of state in (2+1)-flavor QCD with gradient flow
• Pre-equilibrium evolution effects on heavy-ion collision observables
• The iEBE-VISHNU code package for relativistic heavy-ion collisions
• Collective phenomena in non-central nuclear collisions

Cited by

• Kinematic and dynamical origins of mean-p_T fluctuations in heavy-ion collisions
• Observation of partonic collectivity via p_{\rm T}-differential radial flow fluctuations in Au+Au collisions at √s_{\rm NN} = 200 GeV
• Tracing pT-differential radial flow from blast-wave analytics to quark coalescence

Related

• Understanding radial flow fluctuations through event-by-event momentum rescaling
• Observation of partonic collectivity via p_{\rm T}-differential radial flow fluctuations in Au+Au collisions at √s_{\rm NN} = 200 GeV
• Study of the hottest droplet of fluid through correlations and fluctuations of collective variables
• Hydrodynamic Modeling for Relativistic Heavy Ion Collisions at RHIC and the LHC
• Quantifying the degree of hydrodynamic behaviour in heavy-ion collisions