Quantum mechanics

Gaussian

Engineering

Bayesian probability

Statistics

Computational physics

Event (particle physics)

Nuclear physics

Particle physics

Convergence (economics)

Variable (mathematics)

Economics

Market economy

Observable

Statistical physics

Transverse plane

Physics

Heavy ion

Mathematics

Mathematical analysis

Structural engineering

Closure (psychology)

Economic growth

Physical review. C

We introduce a model for heavy ion collisions named Trajectum, which includes an expanded initial stage with a variable free streaming velocity $v_{\rm fs}$ and a hydrodynamic stage with three varying second order transport coefficients. We describe how to obtain a Gaussian Emulator for this 20-parameter model and show results for key observables. This emulator can be used to obtain Bayesian posterior estimates on the parameters, which we test by an elaborate closure test as well as a convergence study. Lastly, we employ the optimal values of the parameters found in [1] to perform a detailed comparison to experimental data from PbPb and $p$Pb collisions. This includes both observables that have been used to obtain these values as well as wider transverse momentum ranges and new observables such as correlations of event-plane angles.

Bayesian analysis of heavy ion collisions with the heavy ion computational framework Trajectum