{"paper":{"title":"Semileptonic sum rules in heavy-to-light charm decays","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["hep-ex"],"primary_cat":"hep-ph","authors_text":"Motoi Endo, Ryoutaro Watanabe, Satoshi Mishima, Syuhei Iguro, Takeru Uchiyama","submitted_at":"2026-05-21T02:30:57Z","abstract_excerpt":"We investigate semileptonic sum rules in heavy-to-light charm decays, motivated by analogous relations in $b \\to c$ and $b \\to u$ transitions. Focusing on the $c \\to d\\overline{\\ell}\\nu$ decays, $D \\to \\pi\\overline{\\ell}\\nu$, $D \\to \\rho\\overline{\\ell}\\nu$, and $\\Lambda_c \\to n\\overline{\\ell}\\nu$, we examine a relation among their lepton-flavor universality ratios $R_H^{\\mu e}$. Although the charm sum rule is less precise than the relations in bottom-hadron decays, current low-energy and high-$p_T$ constraints on new physics restrict the actual deviation from the relation to below the percent "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2605.21908","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/2605.21908/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"}