{"corpus_id":117501523,"paper_sha":"302d472ede014845890e11a2da19a0d413197391","doi":"10.1103/PhysRevLett.98.082001","arxiv_id":"hep-ex/0507019","pmid":null,"pmcid":null,"mag_id":1618265644,"dblp_id":null,"acl_id":null,"title":"Observation of a new charmonium state in double charmonium production in e+ e- annihilation at s**(1/2) ~ 10.6-GeV","year":2005,"publication_date":"2005-07-04","venue":"","journal":{"name":"Physical Review Letters","pages":"082001","volume":"98"},"journal_issn":null,"journal_title":null,"publication_types":[],"pubmed_pub_types":null,"s2_fields_of_study":["Physics"],"reference_count":5,"citation_count":91,"influential_citation_count":6,"is_open_access":true,"arxiv_categories":["hep-ex"],"arxiv_license":null,"arxiv_journal_ref":"Phys.Rev.Lett.98:082001,2007","mesh_headings":null,"chemicals":null,"comments_corrections":null,"source_flags":1,"s2_open_access_pdf_url":"https://arxiv.org/pdf/hep-ex/0507019","s2_open_access_landing_url":"https://www.semanticscholar.org/paper/302d472ede014845890e11a2da19a0d413197391","s2_open_access_license":null,"s2_open_access_status":"GREEN","pmc_open_access_pdf_url":null,"pmc_open_access_landing_url":null,"pmc_open_access_license":null,"pmc_open_access_status":null,"unpaywall_open_access_pdf_url":null,"unpaywall_open_access_landing_url":null,"unpaywall_open_access_license":null,"unpaywall_open_access_status":null,"abstract":"We report the first observation of a new charmonium state at a mass of $(3.943 \\pm 0.006 \\pm 0.006) {GeV}/c^2$. This state, called X(3940), is observed in the process $e^+ e^- \\to J/\\psi X(3940)$ in the spectrum of masses recoiling against a reconstructed $J/\\psi$. We also observe the decay of the X(3940) into $D^* \\bar{D}$ and measure the intrinsic width of this state to be less than $52 MeV/c^2$ at the 90% C.L. These results are obtained from a $350 fb^{-1}$ data sample collected with the Belle detector near the $\\Upsilon(4S)$ resonance, at the KEKB asymmetric energy $e^+ e^-$ collider.","claims":[{"public_id":"cl_80b49d4336bef66be08039dc7ed922ca","status":"active","text":"A new charmonium state, X(3940), is observed for the first time with a mass of (3.943 ± 0.006 ± 0.006) GeV/c^2, produced in the process e+ e- -> J/psi X(3940) and identified in the mass spectrum recoiling against a reconstructed J/psi.","confidence":0.95,"contributors":[{"id":17,"public_id":"322360f1c1","public_label":"Killer Whale (322360f1c1)","roles":["extraction"],"url":"https://sah.borca.ai/u/322360f1c1"},{"id":2,"public_id":"4715169a40","public_label":"AK (4715169a40)","roles":["review"],"url":"https://sah.borca.ai/u/4715169a40"},{"id":136,"public_id":"3c2apqe3ut","public_label":"Anonymous 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