Suppressed decay into open charm for the Y(4260) being an hybrid

By E. Kou, Olivier Pène, A. Yaouanc, L. Oliver, J. Raynal. 2005

134 citations recorded by the source corpus.

We investigate the Y(4260) resonance recently discovered by the Babar collaboration. We propose the observation of its decay into J/psi pi pi and its non observation into open charm as a consequence of it being a charmonium hybrid state with a magnetic constituent gluon. We prove a selection rule forbidding its decay into two S-wave charmed mesons in any potential model. We suggest a generalisation of the selection rule based only on the heavy quark nature of the charm. Comment: 5 pages

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/49e1d7adcf97be40f548d5b59b68bea4e073fa6e

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In Nuclear and High Energy Physics

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

Citations in the corpus

• Heavy-quark QCD exotica (2016, background): “Several groups have noted the following features of the Y (4260) [270, 271, 272]:”
• The hidden-charm pentaquark and tetraquark states (2016, methodology): “[727], and its relative decay rates into various S and P wave charm meson pairs were calculated using QCD string model in”
• The XYZ states: Experimental and theoretical status and perspectives (2019, background): “Thus, the Y(4230) could be a hybrid charmonium with a spin 1 [186, 190] or spin 0 [187, 464] cc̄ core, or a mixture of both.”
• Multiquark Resonances (2016, background): “) is expected to be largely suppressed [208, 209], hence explaining the missing observation of such channels.”
• 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].”
• Excited and exotic charmonium spectroscopy from lattice QCD (2012, background): “A possible interpretation is as a non-exotic hybrid meson [33–35].”
• 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).”
• Hadronic molecules (2017, background): “…context it is interesting to note that also the hybrid picture predicts a large coupling of Y (4260) to D1(2420)D̄ (Barnes et al., 1995; Close and Page, 2005; Kou and Pene, 2005), which could be interpreted as the necessity of considering D1D̄ as a component. π0J/ψ (Ablikim et al., 2015b) do…”
• 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).”