{"paper":{"title":"Precise determination of the properties of $X(3872)$ and of its isovector partner $W_{c1}$","arxiv_id":"2502.04458","primary_cat":"hep-ph","submitted_at":"2025-02-06T19:07:25+00:00","version_compiled":"v4"},"notice":"Every quoted sentence is the authors' text from the arXiv listing abstract. Labels and probabilities are the outputs of classifier-1.13.0 on the question bank abstract-p1-20260923, exactly as returned. No sentence in this record was written by a language model.","schema":"pith.compiled-record/v0","status":"compiled","abstract":{"source":"arXiv listing abstract v4","sentences":[{"i":0,"p":0.9,"id":"s0","own":true,"role":"method","text":"We perform a simultaneous fit to BESIII data on $e^+e^-\\to \\gamma (D^0{\\bar{D}^{0}}\\pi^0/J/\\psi\\pi^+\\pi^-)$ and LHCb data on $B^+\\to K^+(J/\\psi\\pi^+\\pi^-)$ to precisely determine the properties of the $X(3872)$, with full consideration of three-body effects from $D^*\\to D\\pi$ decay, respecting both analyticity and unitarity.","hedge":{"p":0.97,"label":"asserted"},"own_p":0.96,"main_claim_p":0.07,"quantitative":false,"quantitative_p":0.26,"role_probabilities":{"gap":0.0,"method":0.9,"result":0.0,"background":0.0,"limitation":0.0,"future_work":0.0,"contribution":0.1,"interpretation":0.0}},{"i":1,"p":1.0,"id":"s1","own":true,"role":"result","text":"The $X(3872)$ is determined to be a quasi-bound state with a significance of $2.7\\,\\sigma$, representing the most precise determination to date.","hedge":{"p":0.98,"label":"asserted"},"own_p":0.94,"main_claim_p":0.42,"quantitative":true,"quantitative_p":0.99,"role_probabilities":{"gap":0.0,"method":0.0,"result":1.0,"background":0.0,"limitation":0.0,"future_work":0.0,"contribution":0.0,"interpretation":0.0}},{"i":2,"p":1.0,"id":"s2","own":true,"role":"result","text":"Its pole is located at $\\left(-160^{+57}_{-74}-125^{+23}_{-38}\\,i\\right) \\rm keV$, relative to the nominal $D^0\\bar{D}^{*0}$ threshold.","hedge":{"p":1.0,"label":"asserted"},"own_p":0.95,"main_claim_p":0.17,"quantitative":true,"quantitative_p":0.99,"role_probabilities":{"gap":0.0,"method":0.0,"result":1.0,"background":0.0,"limitation":0.0,"future_work":0.0,"contribution":0.0,"interpretation":0.0}},{"i":3,"p":0.99,"id":"s3","own":true,"role":"result","text":"Moreover, we confirm the presence of an isovector partner state, $W_{c1}$.","hedge":{"p":1.0,"label":"asserted"},"own_p":0.92,"main_claim_p":0.17,"quantitative":false,"quantitative_p":0.04,"role_probabilities":{"gap":0.0,"method":0.0,"result":0.99,"background":0.0,"limitation":0.0,"future_work":0.0,"contribution":0.01,"interpretation":0.0}},{"i":4,"p":0.93,"id":"s4","own":true,"role":"result","text":"It is found as a virtual state at $\\left(3.1\\pm0.7+ 1.3^{+1.9}_{-0.6}\\,i\\right)\\ \\rm MeV$ relative to the $D^+ D^{*-}$ threshold on an unphysical Riemann sheet, strongly supporting a molecular nature of both $X(3872)$ and $W_{c1}$.","hedge":{"p":0.97,"label":"asserted"},"own_p":0.96,"main_claim_p":0.23,"quantitative":true,"quantitative_p":0.99,"role_probabilities":{"gap":0.0,"method":0.0,"result":0.93,"background":0.0,"limitation":0.0,"future_work":0.0,"contribution":0.0,"interpretation":0.07}},{"i":5,"p":0.5,"id":"s5","own":true,"role":"future_work","text":"As a highly nontrivial prediction we show that the $W_{c1}$ leads to nontrivial lineshapes around 3.88 GeV in $B^0\\to K^0 X(3872)\\to K^0 D^0\\bar D^0\\pi^0$ and $K^0J/\\psi\\pi^+\\pi^-$ -- thus the scheme presented here can be tested further by improved measurements.","hedge":{"p":0.98,"label":"asserted"},"own_p":0.92,"main_claim_p":0.08,"quantitative":true,"quantitative_p":0.92,"role_probabilities":{"gap":0.0,"method":0.0,"result":0.39,"background":0.0,"limitation":0.0,"future_work":0.5,"contribution":0.09,"interpretation":0.02}}]},"compiled":{"main_claim":{"p":0.65,"text":"It is found as a virtual state at $\\left(3.1\\pm0.7+ 1.3^{+1.9}_{-0.6}\\,i\\right)\\ \\rm MeV$ relative to the $D^+ D^{*-}$ threshold on an unphysical Riemann sheet, strongly supporting a molecular nature of both $X(3872)$ and $W_{c1}$.","location":"abstract s4","hedge_strength":{"p":0.97,"label":"asserted"}},"provenance":{"route":{"via":"TypeSafe API","model":"classifier-1.13.0","endpoint":"https://api.typesafe.ai/v1/systemone","provider":"TypeSafe"},"packing":"one request per 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$e^+e^-\\to \\gamma (D^0{\\bar{D}^{0}}\\pi^0/J/\\psi\\pi^+\\pi^-)$ and LHCb data on $B^+\\to K^+(J/\\psi\\pi^+\\pi^-)$ to precisely determine the properties of the $X(3872)$, with full consideration of three-body effects from $D^*\\to D\\pi$ decay, respecting both analyticity and unitarity.","location":"abstract s0"}},"coverage":{"tier":"abstract","levels_run":["P abstract"],"not_examined":["full text","figures and tables","references and citing sentences","relations to other papers"],"sources_read":["arXiv listing abstract v4"],"levels_not_run":["S sections","T body sentences","C citations","R cross-paper relations"],"sentences_examined":6,"sentences_in_abstract":6},"measured_accuracy":{"url":"https://pith.science/accuracy","measured_on":"2026-10-02","method":"two independent model families labelled a fresh random sample blind; the figure is how often the published label matches their 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