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HK: Fachverband Physik der Hadronen und Kerne
HK 34: Heavy-Ion Collisions and QCD Phases VIII
HK 34.5: Vortrag
Dienstag, 12. März 2024, 18:45–19:00, HBR 62: EG 18
Description of pT spectra of pions, kaons and protons in pp, p*Pb, and Pb*Pb collisions at the LHC with Pythia — •Tim Stellhorn and Anton Andronic — Institut für Kernphysik, Universität Münster
PYTHIA is a general-purpose Monte-Carlo event generator which is broadly used to generate high-energetic pp, p-Pb, and Pb-Pb collision events. In this study, pT spectra resulting from PYTHIA simulations are compared with data from the ALICE experiment at CERN. A particular focus is placed on QGP-like effects such as collective flow which is schematically modelled in PYTHIA via the string shoving mechanism. This model extends the Lund string model by introducing a transverse effect in string interactions in densely populated regions of phase space.
A comparison shows that the MC-generated pT spectra resulting from pp collisions reproduce the ones measured in ALICE within ±30 % depending on pT and particle species. With the string shoving model, the data-model comparison is partially improved but not consistently over pT and particle species.
A possible reason for this is an increased multiplicity due to the generation of excitation gluons in string interactions. One should note, that PYTHIA does not include a consistent tune for the string shoving model yet.