{"paper":{"title":"Observation of Entanglement Enabled Spin-Interference in the Drell-S\\\"oding Process in Au+Au Ultraperipheral Collisions at RHIC","license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","headline":"","cross_cats":["nucl-th"],"primary_cat":"nucl-ex","authors_text":"The STAR Collaboration","submitted_at":"2026-05-22T13:23:06Z","abstract_excerpt":"We report a measurement of the Drell-S\\\"oding $\\pi^+ \\pi^-$ production in Au + Au ultraperipheral collisions at a center-of-mass energy per nucleon pair $\\sqrt{s_{NN}} = 200~\\mathrm{GeV}$ using the STAR detector. For the first time, the Entanglement Enabled Spin-Interference (EESI) effect is observed in the Drell-S\\\"oding process through the amplitude $A_{2\\Delta\\phi}$ of the $\\cos(2\\Delta\\phi)$ modulation. The measured $A_{2\\Delta\\phi}$ exhibits no significant dependence on the invariant mass $M_{\\pi^+ \\pi^-}$. An enhancement of three standard deviations is observed for the Drell-S\\\"oding pro"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2605.23615","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2605.23615/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}