On sensitivity of nucleus deformation on final-state flow harmonics

• Main Authors: Mascalhusk, Henrique, Lemos, Dener S, SocolowskiJr, Otavio, Qian, Wei-Liang, Padula, Sandra S, Yue, Rui-Hong
• Format: Journal Article
• Language: English
• Published: 12-08-2024
• Subjects: Physics - Nuclear Theory
• DOI: 10.48550/arxiv.2408.06249

In this work, we explore the effect of deformation of the nuclei on
collective flow in relativistic heavy-ion collisions. The parameter associated
with the geometrical deformation in the Glauber model is tuned to reproduce the
empirical multiplicity probability distributions correctly. Subsequently, the
particle spectra and collective flows for Au+Au and U+U collisions are
evaluated using a hybrid hydrodynamic code CHESS. We analyze the effects of the
degrees of freedom associated with the IC on the final-state flow harmonics by
exploring the parameter space of the former. The connection between the
deformation parameters, specifically $\beta_2$ and $\beta_4$, and the flow
anisotropies is scrutinized. In particular, deviations in elliptic flow at
$p_{\mathrm{T}}\sim 2$ GeV are observed at smaller values of $\beta_2$ in Au+Au
collisions. On the other hand, for U+U collisions, the averaged overall flow
harmonics are found to be less sensitive to the geometrical parameters. Despite
the difference in the model's specifications, our findings largely confirm
those obtained in the literature employing different approaches, which indicate
that flow harmonics can be used as a sensible probe for the initial geometry
fluctuations and to discriminate between different theoretical models.