{"paper":{"title":"Confirmation of a pi_1^0 Exotic Meson in the \\eta \\pi^0 System","license":"","headline":"","cross_cats":[],"primary_cat":"hep-ex","authors_text":"A. A. Yershov, A. I. Demianov, A. I. Ostrovidov, A. M. Gribushin, A. Tomaradze, C. Olchanski, D. B. White, D. Joffe, D. L. Stienike, D. P. Weygand, D. S. Brown, E. I. Ivanov, E. King, G. S. Adams, H. J. Willutzki, I. N. Vardanyan, J. Hu, J. J. Manak, J. Krenkel, J. Kuhn, J. M. Bishop, J. M. LoSecco, J. P. Cummings, J. P. Dowd, J. S. Suh, K. Danyo, K. K. Seth, L. I. Sarycheva, L. V. Malinina, M. A. Kostin, M. Chasse, M. Hayek, M. Lu, M. Nozar, M. Witkowski, N. B. Sinev, N. M. Cason, N. Shenhav, O. L. Kodolova, P. Eugenio, R. W. Hackenburg, S. A. Taegar, S. U. Chung, T. Adams, T. K. Pedlar, V. A. Bodyagin, V. L. Korotkikh, W. D. Shephard, W. Kern, X. L. Fan, X. Shen, Z. Bar-Yam","submitted_at":"2006-12-25T08:11:35Z","abstract_excerpt":"The exclusive reaction $\\pi^- p \\to \\eta \\pi^0 n$, $\\eta \\to \\pi^+ \\pi^- \\pi^0$ at 18 GeV$/c$ has been studied with a partial wave analysis on a sample of 23~492 $\\eta \\pi^0 n$ events from BNL experiment E852. A mass-dependent fit is consistent with a resonant hypothesis for the $P_+$ wave, thus providing evidence for a neutral exotic meson with $J^{PC} = 1^{-+}$, a mass of $1257 \\pm 20 \\pm 25$ MeV$/c^2$, and a width of $354 \\pm 64 \\pm 60$ MeV$/c^2$. New interpretations of the meson exotics in neutral $\\eta \\pi^0$ system observed in E852 and Crystal Barrel experiments are discussed."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"hep-ex/0612062","kind":"arxiv","version":2},"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/0612062/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"}