{"paper":{"title":"Evidence for a $B_s^0 \\pi^\\pm$ State","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-ph"],"primary_cat":"hep-ex","authors_text":"D0 Collaboration","submitted_at":"2016-02-24T16:44:51Z","abstract_excerpt":"We report evidence of a narrow structure, $X(5568)$, in the decay sequence $X(5568) \\rightarrow B_s^0 \\pi^{\\pm}$, $B_s^0 \\rightarrow J/\\psi \\phi$, $J/\\psi\\rightarrow \\mu^+ \\mu^-$, $\\phi \\rightarrow K^+K^-$. This is evidence for the first instance of a hadronic state with valence quarks of four different flavors. The mass and natural width of this state are measured to be $m = 5567.8 \\pm 2.9 {\\rm \\thinspace (stat)} ^{+0.9}_{-1.9} {\\rm \\thinspace (syst)}$ MeV/$c^2$ and $\\Gamma = 21.9 \\pm 6.4 {\\rm \\thinspace (stat)} ^{+5.0}_{-2.5} {\\rm \\thinspace (syst)} $ MeV/$c^2$. If the decay is $X(5568) \\rig"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1602.07588","kind":"arxiv","version":5},"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"}