{"paper":{"title":"Measuring $|V_{ub}|$ with B$\\to D_s^+ X_u$ transitions","license":"","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"A. Le Yaouanc, J.-C. Raynal, L. Oliver, M. Zito, O. Pene, R. Aleksan","submitted_at":"1999-06-25T16:16:15Z","abstract_excerpt":"We propose the determination of the CKM matrix element $|V_{ub}|$ by the measurement of the spectrum of $B \\to D_s^+ X_u$, dominated by the spectator quark model mechanism $\\bar{b} \\to D_s^{(*)+} \\bar{u}$. The interest of considering $B \\to D_s^+X_u$ versus the semileptonic decay is that more than 50 % of the spectrum for $B \\to D_s^+ X_u$ occurs above the kinematical limit for $B \\to D_s^+ X_c$, while most of the spectrum $B \\to l \\nu X_u$ occurs below the $B \\to l \\nu X_c$ one. Furthermore, the measure of the hadronic mass $M_X$ is easier in the presence of an identified $D_s$ than when a $\\"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"hep-ph/9906504","kind":"arxiv","version":3},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"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"}