{"paper":{"title":"Precision calculation of $\\gamma d\\to \\pi^+ nn$ within chiral perturbation theory","license":"","headline":"","cross_cats":["hep-ph"],"primary_cat":"nucl-th","authors_text":"A.E. Kudryavtsev, C. Hanhart, J. Haidenbauer, U.-G. Mei{\\ss}ner, V. Baru, V. Lensky","submitted_at":"2005-05-13T13:28:08Z","abstract_excerpt":"The reaction $\\gamma d\\to \\pi^+ nn$ is calculated up to order $\\chi^{5/2}$ in chiral perturbation theory, where $\\chi$ denotes the ratio of the pion to the nucleon mass. Special emphasis is put on the role of nucleon--recoil corrections that are the source of contributions with fractional power in $\\chi$. Using the known near threshold production amplitude for $\\gamma p\\to \\pi^+ n$ as the only input, the total cross section for $\\gamma d\\to \\pi^+ nn$ is described very well. A conservative estimate suggests that the theoretical uncertainty for the transition operator amounts to 3 % for the comp"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"nucl-th/0505039","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/nucl-th/0505039/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"}