{"paper":{"title":"Up-down Asymmetries and Angular Distributions in $D\\to K_{1}(\\to K\\pi\\pi)\\ell^+\\nu_{\\ell}$","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["hep-ex"],"primary_cat":"hep-ph","authors_text":"Liang Sun, Lingzhu Bian, Wei Wang","submitted_at":"2021-05-13T11:53:40Z","abstract_excerpt":"Using the helicity amplitude technique, we derive differential decay widths and angular distributions for the decay cascade $D\\to K_{1}(1270,1400)\\ell^+\\nu_{\\ell}\\to (K\\pi\\pi)\\ell^+\\nu_{\\ell} (\\ell=e,\\mu)$, in which the electron and muon mass is explicitly included. Using a set of phenomenological results for $D\\to K_1$ form factors, we calculate partial decay widths and branching fractions for $D^0\\to K_1^-\\ell^+\\nu_{\\ell}$ and $D^+\\to K_1^0\\ell^+\\nu_{\\ell}$, but find that results for ${\\cal B}(D\\to K_1(1270)e^+\\nu_{e})$ are larger than recent BESIII measurements by about a factor 1.5. We fur"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2105.06207","kind":"arxiv","version":1},"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/2105.06207/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"}