Y(4260) and Y(4360) as mixed hadrocharmonium

2013/09/30 by Xin Li, M. B. Voloshin · 7 citations
Physics and Astronomy · #Particle physics theoretical and experimental studies #Physics of Superconductivity and Magnetism #Quantum Chromodynamics and Particle Interactions #hep-ex #hep-ph

paper · pdf · doi:10.1142/s0217732314500606

9 pages, 2 figures. Note added including a comparison of our model with the new BESIII data which became available after the initial version of our paper

arxiv created 2014/02/05 · arxiv updated 2015/06/17

Abstract

Recent BESIII data indicate a significant rate of the process e⁺e^- → h_c π⁺ π^- 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 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/ψππ, ψ' ππ and h_c ππ, including the pattern of interference between the two resonances.

Cited by

• Heavy-Quark QCD Exotica
• Four-quark hadrons: An updated review
• Heavy-hadron molecular spectrum from light-meson exchange saturation
• Recent progress on the study of the charmoniumlike states
• Cross sections for the reactions e⁺e^-→ K⁺K^-π⁺π^-(π⁰), K⁺K^-K⁺K^-(π⁰), π⁺π^-π⁺π^-(π⁰), ppπ⁺π^-(π⁰) in the energy region between 3.773 and 4.600 GeV
• The baryo-quarkonium picture for hidden-charm and bottom pentaquarks and LHCb Pc(4380) and Pc(4450) states
• Study of the e⁺e^-→ J/ψ π⁺π^- lineshape near the D^*D+c.c. threshold and possible signals for exotic hidden charm states

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