$<m_T>$ excitation function: Freeze-out and equation of state dependence
| dc.creator | Petersen, Hannah | |
| dc.creator | Steinheimer, Jan | |
| dc.creator | Bleicher, Marcus | |
| dc.creator | Stoecker, Horst | |
| dc.date | 2009-02-27 | |
| dc.date | 2009-04-14 | |
| dc.date.accessioned | 2026-07-07T13:09:48Z | |
| dc.date.available | 2026-07-07T13:09:48Z | |
| dc.description | An integrated Boltzmann+hydrodynamics transport approach is applied to investigate the dependence of the mean transverse mass on the freeze-out and the equation of state over the energy range from $E_{\rm lab}=2-160A $GeV. This transport approach based on the Ultra-relativistic Quantum Molecular Dynamics (UrQMD) with an intermediate hydrodynamic stage allows for a systematic comparison without adjusting parameters. We find that the multiplicities of pions and protons are rather insensitive to different freeze-out prescriptions and changes in the equation of state, but the yields are slightly reduced in the hybrid model calculation compared to a pure transport calculation while the (anti)kaon multiplicities are increased. The mean transverse mass excitation functions of all three particle species are found to be sensitive to the different freeze-out treatments as well as to the equation of state. We find that the bag model equation of state with a strong first order phase transition is in qualitative agreement with the experimentally observed step-like behaviour in the < m_T > excitation function. The hybrid model with a hadron gas equation of state leads to a overestimation of the < m_T >, especially at higher energies. However, non-equilibrium effects seem also to be substantial as is suggested by the comparison with standard UrQMD results. | |
| dc.description | 12 pages, 8 figures, discussion extended, final version to appaer in J. Phys. G | |
| dc.identifier | https://arxiv.org/abs/0902.4866 | |
| dc.identifier | http://arxiv.org/abs/0902.4866 | |
| dc.identifier | J.Phys.G36:055104,2009 | |
| dc.identifier | doi:10.1088/0954-3899/36/5/055104 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/228859 | |
| dc.subject | Nuclear Theory | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.subject | Nuclear Experiment | |
| dc.title | $<m_T>$ excitation function: Freeze-out and equation of state dependence | |
| dc.type | text |