Bayesian inference of in-medium baryon-baryon scattering cross sections from HADES proton flow data

Within a Bayesian statistical framework using Gaussian Process emulator for an isospin-dependent Boltzmann-Uehling-Uhlenbeck (IBUU) transport model simulator of heavy-ion reactions at intermediate energies, we infer from the HADES proton flow data posterior probability distribution functions in-medium baryon-baryon scattering cross section modification factor X with respect to free-space and corresponding incompressibility K nuclear matter as well their correlation function. The mean value is found be X=1.32−0.40+0.28 68% confidence level assuming will not exceed 400 MeV, providing circumstantial evidence enhanced baryon-braryon sections in hot dense matter.