The complete package, including source files and already predefined tables, is available as a tar file. Please download it and then follow the instructions in "Install".
The very first EPOS4 release:
What is new? The basic principle of treating (nucleonic or partonic) scatterings in parallel, based on S-matrix theory, has been used for two decades. But there is a major problem. For inclusive cross sections, important cancellations occur, leading to factorization (in pp) or binary scaling (in AA). In a parallel scattering scenario, these cancellations must come out (they cannot be imposed), which requires very high precision and good strategies -- and this is provided with EPOS4.
The treatment of parton ladders is completely redone, with unprecedented precision concerning the parton kinematics, in particular in case of heavy flavor partons being involved. Also, backward parton evolution in each of the parallel parton ladders considerably increases the precision of the generation of the "hard processes". And this is crucial to assure all the above-mentioned cancellations.
Another crucial ingredient is the discovery that the "parallel objects" are not simply parton ladders, but ladders with dynamical virtuality cutoffs, referred to as "saturation scales", being fixed by some prescription that guarantees rigorously factorization and binary scaling at large transverse momenta. As a consequence, we can compute within the EPOS framework parton distribution functions (EPOS PDFs) and use them to compute inclusive pp cross sections. The latter ones may be compared with calculations based on other known PDFs, or compared with the EPOS full Monte Carlo.
So for the first time, we may compute inclusive jet production at 1000GeV and at the same time in the same formalism study flow effects at 3GeV in high multiplicity events (where multiple scattering is crucial).
We also use always -- for big and small systems -- microcanonical hadronization, using a new and very efficient algorithm, which allows decaying even big droplets, providing identical results compared to a grand canonical scenario. For small systems, hadrons like multi-strange baryons are suppressed. It should be noted that we do not do "particlization", but hadronization! At some given critical energy density (above the phase transition value), the plasma "decays" into (pre)hadrons, perfectly conserving energy, momentum, and flavor.
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