{"paper":{"title":"Deeply virtual pion production through two-loop order","license":"http://creativecommons.org/licenses/by/4.0/","headline":"The first NNLO QCD calculation of deeply virtual pion production finds substantial positive two-loop corrections that improve agreement with JLab data.","cross_cats":["hep-ex","hep-lat","nucl-ex","nucl-th"],"primary_cat":"hep-ph","authors_text":"Feng Feng, Guang Tang, Qin-Tao Song, Wen Chen, Yu Jia, Zhe-Yu Wang","submitted_at":"2026-04-30T17:48:47Z","abstract_excerpt":"Deeply virtual meson production (DVMP) is among the most prominent channels to extract the nucleon's generalized parton distributions (GPDs) at $ep$ scattering facilities such as {\\tt JLab} and the upcoming {\\tt EIC/EicC} experiments, which plays a vital role in unravelling the three-dimensional internal structure of nucleon. In this work we calculate for the first time the next-to-next-to-leading order (NNLO) QCD radiative corrections to the DV$\\pi$P processes $\\gamma_L^* p\\to \\pi^+ n$ and $\\gamma_L^* p\\to \\pi^0 p$ in the generalized Bjorken limit $Q^2\\gg \\vert t\\vert, \\Lambda_{\\text{QCD}}^2$"},"claims":{"count":4,"items":[{"kind":"strongest_claim","text":"We calculate for the first time the next-to-next-to-leading order (NNLO) QCD radiative corrections to the DVπP processes γ_L^* p → π^+ n and γ_L^* p → π^0 p ... The impact of the two-loop QCD corrections appears to be positive and substantial, including which considerably improves the agreement between the perturbative QCD prediction and the available JLab data.","source":"verdict.strongest_claim","status":"machine_extracted","claim_id":"C1","attestation":"unclaimed"},{"kind":"weakest_assumption","text":"The leading-twist collinear factorization framework remains valid and higher-twist power corrections are negligible throughout the kinematic region Q^2 ≫ |t|, Λ_QCD^2 where the NNLO corrections are applied.","source":"verdict.weakest_assumption","status":"machine_extracted","claim_id":"C2","attestation":"unclaimed"},{"kind":"one_line_summary","text":"The first NNLO QCD corrections to longitudinal deeply virtual pion production are computed and shown to substantially improve agreement with JLab data.","source":"verdict.one_line_summary","status":"machine_extracted","claim_id":"C3","attestation":"unclaimed"},{"kind":"headline","text":"The first NNLO QCD calculation of deeply virtual pion production finds substantial positive two-loop corrections that improve agreement with JLab data.","source":"verdict.pith_extraction.headline","status":"machine_extracted","claim_id":"C4","attestation":"unclaimed"}],"snapshot_sha256":"49edb2524b11f110fae93f8117da070807165c826d7ace80d45396d2d3f2e48a"},"source":{"id":"2604.28164","kind":"arxiv","version":2},"verdict":{"id":"b1e312b5-9123-4200-b186-a2a86c6ffa2d","model_set":{"reader":"grok-4.3"},"created_at":"2026-05-07T05:56:11.445866Z","strongest_claim":"We calculate for the first time the next-to-next-to-leading order (NNLO) QCD radiative corrections to the DVπP processes γ_L^* p → π^+ n and γ_L^* p → π^0 p ... The impact of the two-loop QCD corrections appears to be positive and substantial, including which considerably improves the agreement between the perturbative QCD prediction and the available JLab data.","one_line_summary":"The first NNLO QCD corrections to longitudinal deeply virtual pion production are computed and shown to substantially improve agreement with JLab data.","pipeline_version":"pith-pipeline@v0.9.0","weakest_assumption":"The leading-twist collinear factorization framework remains valid and higher-twist power corrections are negligible throughout the kinematic region Q^2 ≫ |t|, Λ_QCD^2 where the NNLO corrections are applied.","pith_extraction_headline":"The first NNLO QCD calculation of deeply virtual pion production finds substantial positive two-loop corrections that improve agreement with JLab data."},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2604.28164/integrity.json","findings":[],"available":true,"detectors_run":[{"name":"ai_meta_artifact","ran_at":"2026-05-20T20:39:45.761462Z","status":"completed","version":"1.0.0","findings_count":0},{"name":"doi_compliance","ran_at":"2026-05-19T18:33:38.509155Z","status":"completed","version":"1.0.0","findings_count":0}],"snapshot_sha256":"20afd029dc1b69f83067cbce3a28a231bc6d60bc02493af86f8db0adde7374ee"},"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"}