Speaker
Description
We investigate the production of $\phi(1020)$ mesons and $\Omega(1672)$ baryons in central (0–10\%) Pb–Pb collisions at $\sqrt{s_{NN}} = 5.02$ TeV at midrapidity ($|y|<0.5$), focusing on their transverse-momentum spectra, elliptic flow $v_{2}$, and nuclear modification factor $R_{AA}$. The study is performed within a hybrid hadronization framework that combines parton recombination and fragmentation, enabling a unified description of soft and hard processes in heavy-ion collisions.
Thermal partons in the quark–gluon plasma are modeled using a blast-wave parameterization incorporating collective radial flow, while hard and semi-hard shower partons are generated with HIJING and evolved through the medium using Q-PYTHIA to account for parton energy loss. Hadron formation proceeds via recombination of thermal and shower partons, supplemented by fragmentation of remnant shower partons at high transverse momentum. The analysis is carried out on an event-by-event basis.
The transverse-momentum spectra of $\phi$ mesons and $\Omega$ baryons are decomposed into contributions from thermal–thermal, thermal–shower, and shower–shower recombination, as well as fragmentation. We evaluate the elliptic flow coefficients $v_{2}(p_T)$ to examine the collective behavior of strange and multi-strange hadrons and to explore the transfer of partonic anisotropy to final-state hadrons through recombination. The nuclear modification factors $R_{AA}(p_T)$ are obtained by comparing Pb–Pb results with proton–proton baselines generated consistently within the same framework.
Our results indicate that recombination involving strange thermal partons dominates $\phi$ and $\Omega$ production in the intermediate-$p_T$ region, leading to sizable elliptic flow and characteristic modifications of the spectra relative to proton–proton collisions. At higher $p_T$, fragmentation becomes increasingly important. Detailed comparisons with ALICE measurements at the LHC demonstrate that the hybrid recombination–fragmentation approach captures key features of strange hadron production and provides insight into strangeness hadronization and the interplay between soft and hard dynamics in the hot and dense QCD medium.
| Is this an experimental talk? | No |
|---|---|
| Is this on behalf of a collaboration? | No |
| Are you willing to present as a poster if it is not selected for oral presentation? | Yes |