Strong decays of the $Y(4660)$ as a vector tetraquark state in solid quark-hadron duality

Zhi-Gang Wang

doi:10.1140/epjc/s10052-019-6708-5

paper

Strong decays of the $Y (4660)$ as a vector tetraquark state in solid quark-hadron duality

arXiv:1901.02177 · doi:10.1140/epjc/s10052-019-6708-5

Abstract

In this article, we choose the $[sc]_{P} [s ˉ c ˉ]_{A} - [sc]_{A} [s ˉ c ˉ]_{P}$ type tetraquark current to study the hadronic coupling constants in the strong decays $Y (4660) \to J / ψ f_{0} (980)$ , $η_{c} ϕ (1020)$ , $χ_{c 0} ϕ (1020)$ , $D_{s} D ˉ_{s}$ , $D_{s}^{*} D ˉ_{s}^{*}$ , $D_{s} D ˉ_{s}^{*}$ , $D_{s}^{*} D ˉ_{s}$ , $ψ^{'} π^{+} π^{-}$ , $J / ψ ϕ (1020)$ with the QCD sum rules based on solid quark-hadron quality. The predicted width $Γ (Y (4660)) = 74. 2_{- 19.2}^{+ 29.2} MeV$ is in excellent agreement with the experimental data $68\pm 11\pm 1 {\mbox{ MeV}}$ from the Belle collaboration, which supports assigning the $Y (4660)$ to be the $[sc]_{P} [s ˉ c ˉ]_{A} - [sc]_{A} [s ˉ c ˉ]_{P}$ type tetraquark state with $J^{P C} = 1^{--}$ . In calculations, we observe that the hadronic coupling constants $∣ G_{Y ψ^{'} f_{0}} ∣ ≫ ∣ G_{Y J / ψ f_{0}} ∣$ , which is consistent with the observation of the $Y (4660)$ in the $ψ^{'} π^{+} π^{-}$ mass spectrum, and favors the $ψ^{'} f_{0} (980)$ molecule assignment. It is important to search for the process $Y (4660) \to J / ψ ϕ (1020)$ to diagnose the nature of the $Y (4660)$ , as the decay is greatly suppressed.

19 pages, 7 figures. arXiv admin note: text overlap with arXiv:1811.12821, arXiv:1901.06938

Strong decays of the $Y (4660)$ as a vector tetraquark state in solid quark-hadron duality

Abstract

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Strong decays of the Y(4660) as a vector tetraquark state in solid quark-hadron duality

Abstract

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Strong decays of the $Y (4660)$ as a vector tetraquark state in solid quark-hadron duality