How the colour-neutral particles are produced from the quark-gluon plasma, which is a deconfined state of matter with manifest QCD colour degrees of freedom, is a poorly understood fundamental physics problem. The current approach, called the Cooper-Frye procedure, converts the fluid fields like temperature and velocity directly to a distribution of hadron resonances gas. Remarkably, the measured particle yields are in very good agreement with thermal par- ticle production at chemical freeze-out temperature of T = 156 MeV even for a weakly bounded hyper-nuclei.
Most of the produced hadron resonances are short lived and decay to more stable particles before detection. Therefore comparison to momentum resolved experimental data requires numerically costly calculations of resonance decays. We developed a novel way of directly calculating the observed particle spectra by pre-calculating the final spectra in the fluid rest-frame (Mazeliauskas et al., 2019). The computer code FastReso is publicly available. Such fast and efficient technique allowed use to easily include the important effect of resonance decays in a routine experimental analysis procedure of blast-wave fit (Mazeliauskas & Vislavicius, 2020). In addition, we integrated the fast resonance calculation in a hydrodynamic heavy-ion model and performed a detailed of identified particle spectra at LHC (Devetak et al., 2020). We found that there are statistically significant deviations from experimental measured spectra in the low momentum pion spectra, which cannot be rectified even within the range of model parameters and even a larger set of primary resonances. Currently we are exploring the effect of resonance widths to soft pion spectra.
@article{Andronic:2021erx,author={Andronic, Anton and Braun-Munzinger, Peter and K\"ohler, Markus K. and Mazeliauskas, Aleksas and Redlich, Krzysztof and Stachel, Johanna and Vislavicius, Vytautas},title={{The multiple-charm hierarchy in the statistical hadronization model}},archiveprefix={arXiv},primaryclass={hep-ph},doi={10.1007/JHEP07(2021)035},journal={JHEP},volume={07},pages={035},year={2021}}
@article{Mazeliauskas:2019ifr,author={Mazeliauskas, Aleksas and Vislavicius, Vytautas},title={{Temperature and fluid velocity on the freeze-out surface from $\pi$, $K$, $p$ spectra in pp, p-Pb and Pb-Pb collisions}},archiveprefix={arXiv},primaryclass={hep-ph},doi={10.1103/PhysRevC.101.014910},journal={Phys. Rev. C},volume={101},number={1},pages={014910},year={2020}}
@article{Devetak:2019lsk,author={Devetak, D. and Dubla, A. and Floerchinger, S. and Grossi, E. and Masciocchi, S. and Mazeliauskas, A. and Selyuzhenkov, I.},title={{Global fluid fits to identified particle transverse momentum spectra from heavy-ion collisions at the Large Hadron Collider}},archiveprefix={arXiv},primaryclass={hep-ph},doi={10.1007/JHEP06(2020)044},journal={JHEP},volume={06},pages={044},year={2020}}
2019
Eur. Phys. J. C
Fast resonance decays in nuclear collisions
Aleksas Mazeliauskas, Stefan Floerchinger, Eduardo Grossi, and 1 more author
@article{Mazeliauskas:2018irt,author={Mazeliauskas, Aleksas and Floerchinger, Stefan and Grossi, Eduardo and Teaney, Derek},title={{Fast resonance decays in nuclear collisions}},archiveprefix={arXiv},primaryclass={nucl-th},doi={10.1140/epjc/s10052-019-6791-7},journal={Eur. Phys. J. C},volume={79},number={3},pages={284},year={2019},}
