{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"ecfb87fe4b862222027e4721a1c0462bf72e0614dd7250e4ec9de2df01e7480f","created":"2026-10-03T07:18:07Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["4a61b784b6c63b0c31f85a77b65c0981a68c63a042a677b7b7e4068e86bbe785","5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"0e37cfe868f6b467f3fb28709e0fe3eb0d505669b85ab3f8b95744c25d6df572","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"mechanism","assisted_by":[],"external_id":"nuc.gluon-saturation.dihadron-decorrelation","kind":"phenomenon","literature_status":"contested","n":"1","parents":[{"note":"","parent_revision":"4a61b784b6c63b0c31f85a77b65c0981a68c63a042a677b7b7e4068e86bbe785","relation":"special_case"}],"plain":"When a proton hits a gold nucleus, pairs of particles flying forward are less often back-to-back than in proton-proton collisions, which saturation predicts. Other effects, such as extra kicks from ordinary scattering in the nucleus, might also cause it.","posed_since":"","precise":"STAR measured an A-dependent suppression of the away-side peak of forward $\\pi0-\\pi0$ azimuthal correlations ($2.6 < \\eta < 4.0$) in $p+\\mathrm{Al}$ and $p+\\mathrm{Au}$ relative to $p+p$ at $\\sqrt{s_{NN}} = 200 \\mathrm{GeV}$ (STAR, Phys. Rev. Lett. 129, 092501, 2022). Determine whether the suppression and broadening quantitatively require nonlinear gluon dynamics, or are reproduced by linear-evolution calculations with nuclear transverse-momentum broadening, Sudakov resummation and multiparton interactions.","problem_ref":null,"references":"","settled_by":"Calculations of both kinds with common inputs confronted with dihadron data in p+A at RHIC and LHC forward rapidities and in e+A at the Electron-Ion Collider.","status_note":"","title":"Is forward dihadron suppression in proton-nucleus collisions a saturation 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