{"paper":{"title":"Polarization observables in double neutral pion photoproduction","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"nucl-ex","authors_text":"A. Berlin, A. K\\\"aser, A. Thiel, A.V. Anisovich, A.V. Sarantsev, A. Wilson, B. Krusche, B. Roth, CBELSA/TAPS Collaboration: T. Seifen, Ch. Funke, Ch. Hammann, Ch. Honisch, Ch. Schmidt, Ch. Wendel, D. Elsner, D. Kaiser, D. Walther, E. Gutz, E. Klempt, F. Afzal, F. Frommberger, F. Kalischewski, F. Klein, F. Messi, G. Reicherz, G. Urff, H. Dutz, H. Eberhardt, H. Kalinowsky, H. Schmieden, H. van Pee, I. Keshelashvili, J. Hannappel, J. Hartmann, J. Herick, J. M\\\"uller, J. M\\\"ullers, J. Schultes, K. Fornet-Ponse, K. Koop, K. Makonyi, K. Nikonov, K.-Th. Brinkmann, L. Witthauer, M. Becker, M. Bichow, M. Dieterle, M. Gottschall, M. Gr\\\"uner, M. Lang, M. Nanova, M. Urban, N. Stausberg, O. Jahn, Ph. Hoffmeister, Ph. Mahlberg, P. Klassen, R. Beck, R. Novotny, R. Schmitz, S. Reeve, St. Friedrich, St. G\\\"ortz, St. Runkel, T. Jude, T. Rostomyan, U. Thoma, U. Wiedner, V.A. Nikonov, V. Crede, V. Metag, V. Sokhoyan, W. Hillert, W. Meyer, Y. Wunderlich","submitted_at":"2022-07-05T11:48:48Z","abstract_excerpt":"Measurements of target asymmetries and double-polarization observables for the reaction $\\gamma p\\to p\\pi^0\\pi^0$ are reported. The data were taken with the CBELSA/TAPS experiment at the ELSA facility (Bonn University) using the Bonn frozen-spin butanol (C$_4$H$_9$OH) target, which provided transversely polarized protons. Linearly polarized photons were produced via bremsstrahlung off a diamond crystal. The data cover the photon energy range from $E_{\\gamma}$=650 MeV to $E_{\\gamma}$=2600 MeV and nearly the complete angular range. The results have been included in the BnGa partial wave analysis"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2207.01981","kind":"arxiv","version":3},"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/2207.01981/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"}