{"arxiv_id":"1309.1681","title":"Y(4260) and Y(4360) as mixed hadrocharmonium","abstract":"Recent BESIII data indicate a significant rate of the process $e^+e^- \\to h_c \\pi^+ \\pi^-$ at the Y(4260) and Y(4360) resonances, implying a substantial breaking of the heavy quark spin symmetry. We consider these resonances within the picture of hadrocharmonium, i.e. of (relatively) compact charmonium embedded in a light quark mesonic excitation. We suggest that the resonances Y(4260) and Y(4360) are a mixture, with mixing close to maximal, of two states of hadrochamonium, one containing a spin-triplet $c \\bar c$ pair and the other containing a spin-singlet heavy quark pair. We argue that this model is in a reasonable agreement with the available data and produces distinctive and verifiable predictions for the energy dependence of the production rate in $e^+e^-$ annihilation of the final states $J/\\psi \\pi \\pi$, $\\psi' \\pi \\pi$ and $h_c \\pi \\pi$, including the pattern of interference between the two resonances.","primary_cat":"hep-ph","cross_cats":["hep-ex"],"submitted_at":"2013-09-06T15:49:29+00:00","latest_version":3,"source":"arxiv","source_label":"arXiv","source_url":null,"has_pdf":true,"has_source":false,"verdict":"CONDITIONAL","confidence":"MODERATE","one_line_summary":"The Y(4260) and Y(4360) are proposed to be near-maximally mixed hadrocharmonium states, one carrying a spin-triplet and one a spin-singlet charm-anticharm pair, which fixes a distinctive interference pattern between the two resonances.","novelty_score":5.0,"correctness_risk":"medium","formal_verification":"none","upvotes":0,"downvotes":0,"pith_score":0,"inbound_count":10,"_links":{"html":"https://pith.science/paper/1309.1681","verdict":"/api/v1/verdicts/1309.1681"}}