{"work":{"id":"44b4b592-bf74-463b-b72d-9fe0748191c6","openalex_id":null,"doi":null,"arxiv_id":"hep-ex/0309032","raw_key":null,"title":"Observation of a narrow charmonium-like state in exclusive B+ -> K+ pi+pi- J/psi decays","authors":null,"authors_text":"S","year":2003,"venue":"hep-ex","abstract":"We report the observation of a narrow charmonium-like state produced in the exclusive decay process B+ -> K+ pi+pi- J/psi. This state, which decays into pi+pi- J/psi, has a mass of 3872.0+-0.6(stat)+-0.5(syst) MeV, a value that is very near the M_D + M_D* mass threshold. The results are based on an analysis of 152M B-Bbar events collected at the Upsilon(4S) resonance in the Belle detector at the KEKB collider. The statistical significance of the signal is in excess of 10 sigma.","external_url":"https://arxiv.org/abs/hep-ex/0309032","cited_by_count":null,"metadata_source":"pith","metadata_fetched_at":"2026-05-25T07:06:41.310662+00:00","pith_arxiv_id":"hep-ex/0309032","created_at":"2026-05-10T06:26:27.117802+00:00","updated_at":"2026-05-25T07:06:41.310662+00:00","title_quality_ok":true,"display_title":null,"render_title":"Observation of a narrow charmonium-like state in exclusive B+ -> K+ pi+pi- J/psi decays"},"hub":{"state":{"work_id":"44b4b592-bf74-463b-b72d-9fe0748191c6","tier":"hub","tier_reason":"10+ Pith inbound or 1,000+ external citations","pith_inbound_count":16,"external_cited_by_count":null,"distinct_field_count":3,"first_pith_cited_at":"2025-07-29T10:31:35+00:00","last_pith_cited_at":"2026-05-21T18:43:53+00:00","author_build_status":"not_needed","summary_status":"needed","contexts_status":"needed","graph_status":"needed","ask_index_status":"not_needed","reader_status":"not_needed","recognition_status":"not_needed","updated_at":"2026-06-03T08:15:54.220323+00:00","tier_text":"hub"},"tier":"hub","role_counts":[{"context_role":"background","n":7}],"polarity_counts":[{"context_polarity":"background","n":7}],"runs":{},"summary":{},"graph":{},"authors":[]}}