Phenomenological constraints on QCD transport with quantified theory uncertainties
arXiv:2509.19759 · doi:10.1016/j.physletb.2026.140243
Abstract
We present data-driven, state-of-the-art constraints on the temperature-dependent specific shear and bulk viscosities of the quark-gluon plasma from Pb-Pb collisions at . We perform global Bayesian calibration using the JETSCAPE multistage framework with two particlization ansätze, Grad 14-moment and first-order Chapman-Enskog, and quantify theoretical uncertainties via a centrality-dependent model discrepancy term. When theoretical uncertainties are neglected, the specific bulk viscosity and some model parameters inferred using the two ansätze exhibit clear tension. Once theoretical uncertainties are quantified, the Grad and Chapman-Enskog posteriors for all model parameters become almost statistically indistinguishable and yield reliable, uncertainty-aware constraints. Furthermore, the learned discrepancy identifies where each model falls short for specific observables and centrality classes, providing insight into model limitations.
9 pages, 7 figures, and 1 table. Expanded the discussion in Section 3; several minor additions/modifications elsewhere. Results unchanged. Updated to match the published version
References in corpus (21)
- Full result for the QCD equation of state with 2+1 flavors
- Modeling the Panchromatic Spectral Energy Distributions of Galaxies
- Heavy Ion Collisions: The Big Picture, and the Big Questions
- Elliptic and triangular flow in event-by-event (3+1)D viscous hydrodynamics
- Higher harmonic anisotropic flow measurements of charged particles in Pb-Pb collisions at 2.76 TeV
- Centrality dependence of the charged-particle multiplicity density at mid-rapidity in Pb-Pb collisions at = 2.76 TeV
- Weak lensing for precision cosmology
- Multi-system Bayesian constraints on the transport coefficients of QCD matter
- Bayesian analysis of heavy ion collisions with the heavy ion computational framework Trajectum
- Phenomenological constraints on the transport properties of QCD matter with data-driven model averaging
- A transverse momentum differential global analysis of Heavy Ion Collisions
- Event-by-event mean fluctuations in pp and Pb-Pb collisions at the LHC
- Quantifying properties of hot and dense QCD matter through systematic model-to-data comparison
- Flow in AA and pA as an interplay of fluid-like and non-fluid like excitations
- QCD Shear Viscosity at (almost) NLO
- The Present and Future of QCD
- Error Assessment of Computational Models in Chemistry
- Bayesian quantification of strongly-interacting matter with color glass condensate initial conditions
- Early-times Yang-Mills dynamics and the characterization of strongly interacting matter with statistical learning
- Collective dynamics in heavy and light-ion collisions -- I) Kinetic Theory vs. Hydrodynamics
- Collective dynamics in heavy and light-ion collisions -- II) Determining the origin of collective behavior in high-energy collisions