{"paper":{"title":"$D^*\\pi$ interaction from the lineshape of $D_1(2420)$ in $B$-decays","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"Coupled-channel meson interactions reproduce the D*π mass distribution for D1(2420) in B decays.","cross_cats":["nucl-th"],"primary_cat":"hep-ph","authors_text":"A. Mart\\'inez Torres, Breno Agat\\~ao, K. P. Khemchandani, Luciano M. Abreu, Pedro Brand\\~ao","submitted_at":"2025-12-30T17:28:39Z","abstract_excerpt":"We present a model calculation to reproduce the differential mass distribution for the $D^*\\pi$ system in the reactions $B^- \\to D^{*+} \\pi^- \\pi^-$ and $B^{+}\\to D_s^+D^{*-}\\pi^{+}$ analyzed by the LHCb Collaboration, which shows a dominant signal for $D_1(2420)$. %\\textbf{We} (The idea is to) We consider a model based on coupled channel meson-meson interactions that can describe the properties of $D_1(2420)$ in terms of the underlying dynamics, use it to determine the invariant mass distribution of the $D^*\\pi$ system, and compare the results with the experimental data. We also determine the"},"claims":{"count":4,"items":[{"kind":"strongest_claim","text":"We present a model calculation to reproduce the differential mass distribution for the D*π system in the reactions B−→D∗+π−π− and B+→Ds+D∗−π+ analyzed by the LHCb Collaboration, which shows a dominant signal for D1(2420). We also determine the D*π scattering length.","source":"verdict.strongest_claim","status":"machine_extracted","claim_id":"C1","attestation":"unclaimed"},{"kind":"weakest_assumption","text":"That the D1(2420) is generated entirely by coupled-channel meson-meson dynamics with no significant contribution from other degrees of freedom or from the specific hadronization mechanism chosen for the weak decay.","source":"verdict.weakest_assumption","status":"machine_extracted","claim_id":"C2","attestation":"unclaimed"},{"kind":"one_line_summary","text":"A coupled-channel model of meson-meson interactions reproduces the LHCb D*π mass distribution in B decays and yields a D*π scattering length.","source":"verdict.one_line_summary","status":"machine_extracted","claim_id":"C3","attestation":"unclaimed"},{"kind":"headline","text":"Coupled-channel meson interactions reproduce the D*π mass distribution for D1(2420) in B decays.","source":"verdict.pith_extraction.headline","status":"machine_extracted","claim_id":"C4","attestation":"unclaimed"}],"snapshot_sha256":"8f7fd32538c7a99d82a6a8233f7b793f4543848be862e5c522bfda7aa7968404"},"source":{"id":"2512.24370","kind":"arxiv","version":2},"verdict":{"id":"c4956c40-afae-4ce2-a81c-3640d6807d22","model_set":{"reader":"grok-4.3"},"created_at":"2026-05-16T18:46:32.538227Z","strongest_claim":"We present a model calculation to reproduce the differential mass distribution for the D*π system in the reactions B−→D∗+π−π− and B+→Ds+D∗−π+ analyzed by the LHCb Collaboration, which shows a dominant signal for D1(2420). We also determine the D*π scattering length.","one_line_summary":"A coupled-channel model of meson-meson interactions reproduces the LHCb D*π mass distribution in B decays and yields a D*π scattering length.","pipeline_version":"pith-pipeline@v0.9.0","weakest_assumption":"That the D1(2420) is generated entirely by coupled-channel meson-meson dynamics with no significant contribution from other degrees of freedom or from the specific hadronization mechanism chosen for the weak decay.","pith_extraction_headline":"Coupled-channel meson interactions reproduce the D*π mass distribution for D1(2420) in B decays."},"references":{"count":25,"sample":[{"doi":"","year":2024,"title":"S. Acharyaet al.(ALICE), Phys. Rev. D110, 032004 (2024)","work_id":"26343f3a-08e5-47f1-af8a-1a0c96efc68d","ref_index":1,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2019,"title":"Z.-H. Guo, L. Liu, U.-G. Meißner, J. A. Oller, and A. Rusetsky, Eur. Phys. J. C79, 13 (2019)","work_id":"339f6e5c-ce02-42ed-ad93-dededa2fc7b8","ref_index":2,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2009,"title":"F.-K. Guo, C. Hanhart, and U.-G. Meissner, Eur. Phys. J. A40, 171 (2009)","work_id":"ec966570-f93f-4a98-b81b-04e0bd530c6e","ref_index":3,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2011,"title":"L. M. Abreu, D. Cabrera, F. J. Llanes-Estrada, and J. M. Torres-Rincon, Annals Phys.326, 2737 (2011)","work_id":"2a5d7a7d-0575-4aaf-aaf3-0c5208b700de","ref_index":4,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2010,"title":"L. S. Geng, N. Kaiser, J. Martin-Camalich, and W. Weise, Phys. Rev. D82, 054022 (2010)","work_id":"233f5943-8122-4893-ae43-0040983ec375","ref_index":5,"cited_arxiv_id":"","is_internal_anchor":false}],"resolved_work":25,"snapshot_sha256":"9ea49627d39247dcd8d319b93771db43b6dcdc438ec07e67d017de21b2068dfd","internal_anchors":3},"formal_canon":{"evidence_count":2,"snapshot_sha256":"ba358064d705dc3b912e6e0cf56e546b095045fb0a64dfcbf928feb931d76b65"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}