2019/01/31 by Zhi-Gang Wang · 1 citation
Physics and Astronomy · #hep-ph
paper · pdf · doi:10.1140/epjc/s10052-019-6708-5
published as Eur. Phys. J. C79 (2019) 184 · 19 pages, 7 figures. arXiv admin note: text overlap with arXiv:1811.12821, arXiv:1901.06938
arxiv created 2019/02/12 · arxiv updated 2019/03/05
In this article, we choose the [sc]P[sc]A-[sc]A[sc]P type tetraquark current to study the hadronic coupling constants in the strong decays Y(4660)→ J/ψf0(980), ηc ϕ(1020), χc0ϕ(1020), DsDs, Ds^* D^*s, Ds D^*s, Ds^* Ds, ψ^′ π+π-, J/ψϕ(1020) with the QCD sum rules based on solid quark-hadron quality. The predicted width Γ(Y(4660) )= 74.2+29.2-19.2 \rmMeV is in excellent agreement with the experimental data 68± 11± 1 MeV from the Belle collaboration, which supports assigning the Y(4660) to be the [sc]P[sc]A-[sc]A[sc]P type tetraquark state with JPC=1--. In calculations, we observe that the hadronic coupling constants |GYψ^′ f0|≫ |GY J/ψf0|, which is consistent with the observation of the Y(4660) in the ψ^′π+π- mass spectrum, and favors the ψ′f0(980) molecule assignment. It is important to search for the process Y(4660)→ J/ψϕ(1020) to diagnose the nature of the Y(4660), as the decay is greatly suppressed.