Backward nucleons in p+A collisions can be produced by heavy baryonic resonances that undergo successive rescatterings with nuclear nucleons, a mechanism the authors support with analytic kinematics and UrQMD simulations.
Equation of State, Spectra and Composition of Hot and Dense Infinite Hadronic Matter in a Microscopic Transport Model
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abstract
Equilibrium properties of infinite relativistic hadron matter are investigated using the Ultrarelativistic Quantum Molecular Dynamics (UrQMD) model. The simulations are performed in a box with periodic boundary conditions. Equilibration times depend critically on energy and baryon densities. Energy spectra of various hadronic species are shown to be isotropic and consistent with a single temperature in equilibrium. The variation of energy density versus temperature shows a Hagedorn-like behavior with a limiting temperature of 130$\pm$10 MeV. Comparison of abundances of different particle species to ideal hadron gas model predictions show good agreement only if detailed balance is implemented for all channels. At low energy densities, high mass resonances are not relevant; however, their importance raises with increasing energy density. The relevance of these different conceptual frameworks for any interpretation of experimental data is questioned.
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Backward nucleon production by heavy baryonic resonances in proton-nucleus collisions
Backward nucleons in p+A collisions can be produced by heavy baryonic resonances that undergo successive rescatterings with nuclear nucleons, a mechanism the authors support with analytic kinematics and UrQMD simulations.