Investigating quarkonium collectivity in heavy-ion collisions

Abstract

The quark-gluon plasma (QGP) produced in ultrarelativistic heavy-ion collisions has exhibited properties of a mostly perfect fluid. These properties can be observed through the hydrodynamic expansion of the QGP. Experimentally, this was established by measuring azimuthal anisotropies in the final state, known as elliptic flow ($v_2$) or higher order harmonics such as triangular flow ($v_3$). These Fourier harmonic coefficients have been extensively measured in past experiments using inclusive charged particles or identified particles in the soft sector. Interestingly, measuring such coefficients using hard probes, such as quarkonia, brings additional information about heavy-quarks production and thermalization in the QGP. In this study, we investigate quarkonia collectivity using Run 3 data collected in 2023, presenting new flow measurements. We employ different experimental methods to extract flow coefficients, including the scalar product, event plane, and cumulant methods. These results will impose new constraints on theoretical models, enhancing our understanding of quarkonia behavior in heavy-ion collisions.