Speaker
Description
Differential hyperon spin correlations may provide a new window into local chiral dynamics in relativistic heavy-ion collisions. In this talk, we study ΛΛ̄ spin correlations in Au+Au collisions at √sₙₙ = 200 GeV using AMPT supplemented with a chiral anomaly transport (CAT) module. The framework incorporates hyperon polarization induced by thermal vorticity, shear effects, and a finite axial chemical potential μ₅, and is constrained by existing measurements of global and longitudinal hyperon polarization as well as charge-dependent azimuthal correlations.
We focus on the dependence of the ΛΛ̄ spin correlation on the pair separation, ΔR = √[(Δη)² + (Δφ)²]. A finite chiral imbalance leads to a sizable enhancement of the correlation, while contributions from vorticity and shear alone remain comparatively small in the studied kinematic region. Spatial fluctuations of μ₅ further generate a characteristic short-range correlation structure, whose magnitude and spatial extent vary systematically with the fluctuation strength and effective coherence scale of the axial-charge field. These results suggest that differential ΛΛ̄ spin correlations can provide complementary constraints on both the strength and spatial structure of chiral imbalance fluctuations in heavy-ion collisions.
