Sprecher
Beschreibung
The isobar collisions realized at RHIC provide a unique opportunity to probe nuclear structure effects in relativistic heavy-ion collisions. In this work, we use the STAR isobar data to perform a Bayesian calibration including nuclear structure parameters. The nuclear densities are described by deformed Woods-Saxon distributions, supplemented by a step-like two-nucleon correlation function that models short-range nucleon-nucleon correlations. From the resulting posterior distribution, we propagate the inferred nuclear parameters to operator-level observables that characterize one- and two-body contributions to nuclear eccentricity fluctuations. We also compute Kumar invariants from the same posterior samples, allowing a comparison between the high-energy operator language of eccentricity fluctuations and the traditional low-energy nuclear-structure description based on electromagnetic quadrupole correlations. Our results show a strong linear correlation between the high-energy two-body eccentricity operators and the respective low-energy Kumar invariants.