Ψ-X₂ Resonance: Experimental Signatures of a 619 MeV Boson Candidate

This dataset contains all relevant materials related to the proposed Ψ-X₂ boson predicted by the Ψ-Theory. The ZIP archive includes real experimental resonance plots, cross section comparisons using Belle II and HEPData, a Breit–Wigner fit, and a structured readme. The central finding is a resonance at ~619 MeV, matching the mass predicted by the Ψ-Theory. This dataset is intended to accompany the main Ψ-Theory manuscript and serves as a standalone, citable evidence package for immediate evaluation by the scientific community.