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Version 1.3
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@vlvovch vlvovch released this 07 Nov 09:38
· 89 commits to master since this release
v1.3
b19e19c

Version 1.3 contains a number of new features, improvements, and bugfixes

Partial chemical equilibrium (PCE)

This release implements HRG in partial chemical equilibrium (PCE) [Bebie et al, Nucl. Phys. B 378, 95 (1992)], as appropriate for modeling the hadronic phase of heavy-ion collisions. PCE is implemented as a new ThermalModelPCE class, and has been used in two recent papers, Phys. Lett. B 800, 135131 (2020) and Phys. Rev. C 102, 024909 (2020)

See PCE-Saha-LHC.cpp for a usage example and this link for documentation.

The PCE-HRG model is available in the thermal fitting routine, with Tkin being an extra fitting parameter

The PCE-HRG is also accessible for use in the graphical user interface program through a button PCE/Saha/Other...

Particle lists

  • The default particle list is now based on the 2020 edition of the PDG listing. As before, the list contains only hadrons and resonances with an established status. Changes compared to the old 2014 PDG list are mild.

  • Version 1.3 now fully supports charm. The charmed hadrons are available in an extended input list file list-withcharm.dat

  • The excited nuclei with mass number up to A = 5 have been added with this release, they are available in an extended input list file list-withexcitednuclei.dat. The reference for this list of excited nuclei is Phys. Lett. B 809, 135746 (2020)

  • The hadron list converted from SMASH transport model (version 1.8) is available here

Other changes

  • Mixed-canonical ensembles in Monte Carlo event generator
  • Reworked cylindrical blast-wave event generator with much faster initialization
  • Cracow freeze-out generator
  • Fermi-Dirac and Bose-Einstein momentum samplers for the event generator with quantum statistics
  • Correct decay kinematics involving leptons and photons, the decay leptons/photons, if any, are included in event generator output
  • Option for modular loading of particle lists
  • Functions for computing net-particle/net-charge correlators (see documentation)
  • Leptons and photons will appear in decays of some hadrons with correct kinematics, even if they are not included in the particle list

Changes to the graphical user interface

  • Calculation of matrices of various 2nd-order correlators (accessible on the Thermal model tab via Correlations... button
  • For quantum van der Waals and X-terms excluded volume models: the EV/vdW interactions by default are now only for baryon-baryon and antibaryon-antibaryon pairs, in order to make it consistent with the literature
  • Enable PCE mode via PCE/Saha/Other..., then possible to fit Tkin in the thermal fits mode
  • Option for quantum statistical momentum distribution in the event generator mode (note that multiplicity distributions are still Poisson!)
  • Mixed-canonical ensembles in the event generator mode
  • Cracow model in the event generator mode

Bugfixes

  • Fix for Bose-Einstein condensation issue in event generator with finite resonance widths
  • Fix for Fermi-Dirac integrals in case of massless particles
  • Fix for decay properties of some charmed hadrons
  • Fix for momentum sampling in event generators in case of zero collective/radial flow
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