Erlangen 2026 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 15: Heavy-Ion Collisions and QCD Phases II

HK 15.10: Talk

Tuesday, March 17, 2026, 18:30–18:45, PHIL C 601

Dependence of resonance parameters on the pion momentum spectra — •Tim Weinreich — Physikalisches Institut, Universität Heidelberg

Ultrarelativistic heavy-ion collisions, which are studied at the Large Hadron Collider and Relativistic Heavy Ion Collider, are believed to create a deconfined state of matter called the Quark-Gluon-Plasma. It has been demonstrated that this state can be adequately described by relativistic viscous hydrodynamics. However, some of the measured observables or features observed in experimental data remain to be fully understood.

For instance, the pion spectrum at low transverse momentum indicates a discrepancy between experimental data and hydrodynamic models. One potential explanation for this phenomenon is the insufficient treatment of resonances that contribute to the total particle spectra. In fact, heavy-ion collision models typically neglect or omit uncertainties in all resonance parameters, e.g., resonance masses, decay widths, and branching ratios.

This talk presents a systematic study investigating the dependence of resonance parameter uncertainties on the pion production. This study is conducted using the FastReso [1] framework to calculate the irreducible spectral components for resonance decays.

This work is funded via the DFG ISOQUANT Collaborative Research Center (SFB 1225).

[1] Mazeliauskas, A. et al. Eur. Phys. J. C 79, 284 (2019)

Keywords: Pion-excess; Resonances; FastReso