{"paper":{"title":"Observation of two excited B$^+_\\mathrm{c}$ states and measurement of the B$^+_\\mathrm{c}$(2S) mass in pp collisions at $\\sqrt{s} =$ 13 TeV","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"hep-ex","authors_text":"CMS Collaboration","submitted_at":"2019-02-01T22:03:23Z","abstract_excerpt":"Signals consistent with the B$^+_\\mathrm{c}$(2S) and B$^{*+}_\\mathrm{c}$(2S) states are observed in proton-proton collisions at $\\sqrt{s} =$ 13 TeV, in an event sample corresponding to an integrated luminosity of 143 fb$^{-1}$, collected by the CMS experiment during the 2015-2018 LHC running periods. These excited $\\bar{\\mathrm{b}}$c states are observed in the B$^+_\\mathrm{c}\\pi^+\\pi^-$ invariant mass spectrum, with the ground state B$^+_\\mathrm{c}$ reconstructed through its decay to J/$\\psi\\,\\pi^+$. The two states are reconstructed as two well-resolved peaks, separated in mass by 29.1 $\\pm$ 1"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1902.00571","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"}