Effective Contact Theory for Exotic Loosely Bound States in Strongly Interacting Expanding Matter
The paper proposes an effective contact theory to describe exotic loosely bound states in strongly interacting matter. It replaces traditional hard coalescence with a smooth kernel derived from localization at kinetic freeze-out, linking bound state production to continuum correlations. This framework suggests that both bound and continuum observables originate from a common two-particle density matrix, establishing universality.