The Possible Interpretations of Y(4260)

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dc.creatorZhu, Shi-Lin
dc.date2005-07-02
dc.date2005-08-09
dc.date.accessioned2026-07-07T11:26:43Z
dc.date.available2026-07-07T11:26:43Z
dc.descriptionThe 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 $π^+π^-π^0 J/ψ$ 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.
dc.descriptionsome references added
dc.identifierhttps://arxiv.org/abs/hep-ph/0507025
dc.identifierhttp://arxiv.org/abs/hep-ph/0507025
dc.identifierPhys.Lett.B625:212,2005
dc.identifierdoi:10.1016/j.physletb.2005.08.068
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/195922
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectHigh Energy Physics - Experiment
dc.subjectHigh Energy Physics - Lattice
dc.titleThe Possible Interpretations of Y(4260)
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