{"paper":{"title":"Helicity dependent cross sections for the photoproduction of $\\pi^0\\pi^{\\pm}$ pairs from quasi-free nucleons","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"nucl-ex","authors_text":"A2 Collaboration: D. Ghosal, A. Braghieri, A. Denig, A. Fix, A. K\\\"aser, A. Lazarev, A. Neganov, A. Neiser, A. Powell, A.S. Dolzhikov, A. Thiel, A. Thomas, B. Krusche, C. Collicot, Ch. Meier, C. Mullen, D. Gurevich, D. Hornidge, D.I. Glazier, D.M. Manley, D. Paudyal, D.P. Watts, D. Werthm\\\"uller, E.J. Downie, E. Mornacchi, F. Afzal, F. Cividini, G.M. Huber, G. Reicherz, I. Gorodnov, I.I. Strakovsky, I.J.D. MacGregor, J.R.M. Annand, J. Wettig, K. Livingston, K. Spieker, L. Heijkenskj\\\"old, L. Witthauer, M. Bashkanov, M. Biroth, M. Dieterle, M. G\\\"unther, M. Korolija, M. Mocanu, M. Ostrick, M. Thiel, M. Unverzagt, M. Wolfes, N. Borisov, N. Jermann, N.K. Walford, N. Zachariou, O. Steffen, P. Achenbach, P. Drexler, P. Otte, P. Pedroni, P.P. Martel, R. Beck, R. Miskimen, S. Abt, S. Costanza, S. Fegan, S. Gardner, S. Lutterer, S. Wagner, T. Rostomyan, V.L. Kashevarov, V. Sokhoyan, W. Gradl, W.J. Briscoe, Yu.A. Usov, Z. Ahmed","submitted_at":"2023-08-29T12:00:41Z","abstract_excerpt":"Photoproduction of $\\pi^0\\pi^{\\pm}$-pairs from quasifree nucleons bound in the deuteron has been investigated to study the helicity dependence of this reaction. Measurements with a liquid deuterium target were used to extract the unpolarized cross sections for reactions on protons and neutrons. A deuterated, longitudinally polarized solid-butanol target, together with a circularly polarized photon beam, determined the double polarization observable $E$. From these results the spin-dependent cross sections $\\sigma_{1/2}$ and $\\sigma_{3/2}$, corresponding to the anti-parallel and parallel spin c"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2308.15240","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/2308.15240/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"}