The Possible Interpretations of Y(4260)

By Shi-Lin Zhu. 2005

142 citations recorded by the source corpus.

Abstract The recently observed Y(4260) lies far above the decay threshold with a width less than 100 MeV. We argue that it is very difficult to accommodate Y(4260) as a conventional c c ¯ radial excitation or a D-wave state. It cannot 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 ′ ( 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 ′ ( 4260 ) can easily confirm/reject the tetraquark hypothesis. However, a tetraquark far above threshold can fall apart into D D ¯ , D * D ¯ very easily. Its not-so-large width and the non-observation of D D ¯ mode tend to disfavor the tetraquark hypothesis. Hence the only feasible interpretation is a hybrid charmonium if Y(4260) is NOT an experimental artifact. At present, none of the experimental information from BaBar measurement is in conflict with the hybrid charmonium picture.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/5747557dca2bc621639e6e181a329880749605d5

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Nuclear and High Energy Physics

1. Xiang Liu
2. J. Dudek
3. S. Godfrey
4. E. Swanson
5. S. Olsen
6. T. Skwarnicki
7. Shi-Lin Zhu
8. R. Mitchell

Citations in the corpus

• The XYZ states: Experimental and theoretical status and perspectives (2019, background): “For the Y(4230), popular theoretical interpretations include a DD̄1(2420) molecule [154, 184, 185], a cc̄-gluon hybrid [186–188], a compact tetraquark state [189], a hadrocharmonium [190, 191].”
• Nonstandard heavy mesons and baryons: Experimental evidence (2017, background): “most strongly promoted as a candidate for a cc̄-gluon charmonium hybrid is the 1−− Y (4260) (302; 303; 304).”
• Excited and exotic charmonium spectroscopy from lattice QCD (2012, background): “A possible interpretation is as a non-exotic hybrid meson [33–35].”
• The Exotic XYZ Charmonium-Like Mesons (2008, background): “An attractive interpretation is that the Y (4260) is a charmonium hybrid (109, 110, 111).”
• Quarkonia and their transitions (2007, background): “A number of explanations have appeared in the literature: ψ(4S) (Llanes-Estrada, 2005), csc̄s̄ tetraquark (Maiani et al., 2005b), and cc̄ hybrid (Close and Page, 2005; Kou and Pene, 2005; Zhu, 2005).”
• The hidden-charm pentaquark and tetraquark states (2016, background): “The main points are summarized below [722]”
• Exotics: Heavy pentaquarks and tetraquarks (2017, background): “Very much along the same lines, but much earlier, a hybrid interpretation was advanced for the J = 1−− state Y (4260), which has a small e+e− annihilation cross section [51, 312, 313].”
• Heavy-quark QCD exotica (2016, background): “Several groups have noted the following features of the Y (4260) [270, 271, 272]:”