{"paper":{"title":"A Study of the \\eta \\pi^{0} Spectrum and Search for a J^{PC} = 1^{-+} Exotic Meson","license":"","headline":"","cross_cats":[],"primary_cat":"hep-ex","authors_text":"A. P. Szczepaniak, A. R. Dzierba, A. V. Popov, D. I. Ryabchikov, E. Scott, J. Gunter, J. Napolitano, L. I. Sarycheva, M. R. Shepherd, M. ~Swat, P. Smith, R. Lindenbusch, S. Ichiriu, S. P. Denisov, S. Teige","submitted_at":"2003-04-01T16:49:37Z","abstract_excerpt":"A partial wave analysis (PWA) of the of the $\\eta \\pi ^0$ system (where $\\eta \\to \\gamma \\gamma$) produced in the charge exchange reaction $\\pi ^-p\\to \\eta \\pi ^0n$ at an incident momentum of 18 GeV$/c$ is presented as a function of ${\\eta \\pi ^0}$ invariant mass, $m_{\\eta\\pi^0}$, and momentum transfer squared, $t_{\\pi^{-}\\to\\eta\\pi}$, from the incident $\\pi^-$ to the outgoing ${\\eta\\pi ^0}$ system. $S$, $P$ and $D$ waves were included in the PWA. The $a_0(980)$ and $a_2(1320)$ states are clearly observed in the overall ${\\eta\\pi ^0}$ effective mass distribution as well as in the amplitudes as"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"hep-ex/0304002","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/hep-ex/0304002/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"}