{"paper":{"title":"Partial-wave decomposition of the diffractively produced $\\pi^-\\pi^+\\pi^-\\eta$ final state at COMPASS","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"hep-ex","authors_text":"David Sp\\\"ulbeck (for the COMPASS Collaboration)","submitted_at":"2025-08-26T10:26:51Z","abstract_excerpt":"One of the prime goals of the COMPASS experiment at CERN is the study of the light meson spectrum, with a particular emphasis on the search for exotic states. We present the first high-statistics partial-wave decomposition of the diffractive reaction $\\pi^-+p\\to \\pi^-\\pi^+\\pi^-\\eta+p$, which spans a wide range of decay channels, such as $f_1(1285)\\pi^-$, $a_2^-(1320)\\eta$, $\\eta^\\prime\\pi^-$, and $\\rho(770)a_0^-(980)$. This analysis also includes decay channels, i.e. $f_1(1285)\\pi^-$ and $\\eta^\\prime\\pi^-$, predicted by theoretical models for the lightest hybrid meson and providing the opportu"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2508.18908","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/2508.18908/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"}