Speaker
Description
Probing initial geometry through collectivity in d+Au and O+O collisions at STAR
Zaining Wang (for STAR Collaboration)
A small system geometry scan provides critical insights into the initial conditions of quark-gluon plasma. The initial state conditions, influenced by structural effects such as the many-body properties of light nuclear shapes, also leave a distinct footprint in the correlations among final-state particles. In this talk, we present preliminary measurements of flow harmonics ($v_2$ and $v_3$) obtained from multi-particle correlations in d$+^{197}$Au, $^{3}$He+$^{197}$Au, and $^{16}$O+$^{16}$O collisions at 200 GeV, based on newly collected data from STAR. These measurements are compared to hydrodynamics with the state-of-the-art $ab$ $initio$ calculations, illustrating the features of initial geometry, sub-nucleon fluctuations, and nucleonic clustering features. This finding highlights a deeper understanding of initial conditions and collectivity in small system collisions.
