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HK: Fachverband Physik der Hadronen und Kerne
HK 27: Poster Session
HK 27.18: Poster
Mittwoch, 18. März 2026, 16:15–18:30, Redoutensaal
A Comparative Study of Baryon Stopping Models: SMASH and ANGANTYR — •Manou P. Engel1, Carl B. Rosenkvist1,3, and Hannah Elfner2,1,3,4 — 1Institute for Theoretical Physics, Goethe University, Max-von-Laue-Strasse 1, 60438 Frankfurt am Main, Germany — 2GSI Helmholtzzentrum für Schwerionenforschung, Planckstr. 1, 64291 Darmstadt, Germany — 3Frankfurt Institute for Advanced Studies, Ruth-Moufang-Strasse 1, 60438 Frankfurt am Main, Germany — 4Helmholtz Research Academy Hesse for FAIR (HFHF), GSI Helmholtz Center, Campus Frankfurt, Max-von-Laue-Strasse 12, 60438 Frankfurt am Main, Germany
In SMASH, a hadronic transport model, particle formation is modeled through hadronic resonances as well as string excitation and fragmentation, handled by PYTHIA8. Leading hadrons can interact earlier than newly produced, not yet fully formed hadrons. This mechanism reproduces baryon stopping in experimental data well at low collision energies, while it tends to overestimate stopping at high energies.
ANGANTYR, PYTHIA8’s default Glauber-based heavy-ion model, models stopping through multiple nucleon interactions and provides a more realistic description of baryon stopping at LHC energies.
In this work, these two approaches will be compared to identify possible avenues to improve the description of baryon stopping in SMASH across collision energies. Specifically, we study their rapidity distributions and transverse-mass spectra as functions of centrality and collision energy. The results are compared to heavy-ion data from the LHC and from the STAR experiment at RHIC.
Keywords: SMASH; Baryon stopping