Enhancing Bayesian parameter estimation by adapting to multiple energy scales in heavy-ion collisions at RHIC and at the LHC

Improved constraints on current model parameters in a heavy-ion collision model are established using the latest measurements from three distinct collision systems. Various observables are utilized from Au–Au collisions at <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:mrow><a:msqrt><a:msub><a:mi>s</a:mi><a:mi>NN</a:mi></a:msub></a:msqrt><a:mo>=</a:mo><a:mn>200</a:mn></a:mrow></a:math> GeV and Pb–Pb collisions at <b:math xmlns:b="http://www.w3.org/1998/Math/MathML"><b:mrow><b:msqrt><b:msub><b:mi>s</b:mi><b:mi>NN</b:mi></b:msub></b:msqrt><b:mo>=</b:mo><b:mn>5.02</b:mn></b:mrow></b:math> TeV and <c:math xmlns:c="http://www.w3.org/1998/Math/MathML"><c:mrow><c:msqrt><c:msub><c:mi>s</c:mi><c:mi>NN</c:mi></c:msub></c:msqrt><c:mo>=</c:mo><c:mn>2.76</c:mn></c:mrow></c:math> TeV. Additionally, the calibration of centrality is now carried out separately for all parametrizations. The inclusion of an Au–Au collision system with an order of magnitude lower beam energy, along with separate centrality calibration, suggests a preference for smaller values of nucleon width, minimum volume per nucleon, and free-streaming time. The results with the acquired parameters show improved agreement with the data for the second-order flow coefficient, identified particle yields, and mean transverse momenta. This work contributes to a more comprehensive understanding of heavy-ion collision dynamics and sets the stage for future improvements in theoretical modeling and experimental measurements.