# Resonance decay dynamics and their effects on ${p}_{T}$ spectra of pions in heavy-ion collisions

Lo, Pok Man (Institute of Theoretical Physics, University of Wroclaw, PL-50204 Wrocław, Poland and Extreme Matter Institute (EMMI), GSI, Planckstrasse 1, D-64291 Darmstadt, Germany)

04 April 2018

Abstract: The influence of resonance decay dynamics on the momentum spectra of pions in heavy-ion collisions is examined. Taking the decay processes $\omega \to 3\pi$ and $\rho \to 2\pi$ as examples, I demonstrate how the resonance width and details of decay dynamics (via the decay matrix element) can modify the physical observables. The latter effect is commonly neglected in statistical models. To remedy the situation, a theoretical framework for incorporating hadron dynamics into the analysis is formulated, which can be straightforwardly extended to describe general $N$-body decays.

Published in: Phys. Rev. C 97 (2018)