{"arxiv_id":"hep-ph/0507025","title":"The Possible Interpretations of Y(4260)","abstract":"The recently observed Y(4260) lies far above the decay threshold with a width less than 100 MeV. We argue that it's very difficult to accommodate Y(4260) as a conventional $c\\bar c$ radial excitation or a D-wave state. It can't be a hadronic molecule. Its production mechanism and special decay pattern do not favor the glueball interpretation. If Y(4260) is a scalar tetraquark, it must be produced by the I=0 component of the virtual photon. Then the $I=1, I_z=0$ component of the virtual photon should have produced its isovector partner $Y^\\prime (4260)$, which may be searched for in the decay channel $\\pi^+\\pi^-\\pi^0 J/\\psi$ using exactly the same database from the initial state radiation process. The observation/non-observation of $Y^\\prime (4260)$ can easily confirm/reject the tetraquark hypothesis. However, a tetraquark far above threshold can fall apart into $D\\bar D, D^\\ast\\bar D$ very easily. Its not-so-large width and the non-observation of $D\\bar D$ mode tend to disfavor the tetraquark hypothesis. Hence the only feasible interpretation is a hybrid charmonium if Y(4260) is {\\sl NOT} an experimental artifact. At present, none of the experimental information from BABAR measurement is in conflict with the hybrid charmonium picture.","primary_cat":"hep-ph","cross_cats":["hep-ex","hep-lat"],"submitted_at":"2005-07-02T09:45:49+00:00","latest_version":2,"source":"arxiv","source_label":"arXiv","source_url":null,"has_pdf":true,"has_source":false,"verdict":"CONDITIONAL","confidence":"MODERATE","one_line_summary":"Y(4260) is best explained as a hybrid charmonium, and a search for an isovector partner in the pi+pi-pi0 J/psi channel would confirm or exclude the tetraquark alternative.","novelty_score":5.0,"correctness_risk":"medium","formal_verification":"none","upvotes":0,"downvotes":0,"pith_score":0.0,"inbound_count":17,"_links":{"html":"https://pith.science/paper/hep-ph/0507025","verdict":"/api/v1/verdicts/hep-ph/0507025"}}