2020/01/22 by Jun-Zhang Wang, Ri-Qing Qian, Xiang Liu +1 · 1 citation
Physics and Astronomy · #hep-ph #hep-ex
paper · pdf · doi:10.1103/physrevd.101.034001
published as Phys. Rev. D 101, 034001 (2020) · 11 pages, 4 tables and 8 figures. More discussions and references added. Accepted by Phys. Rev. D
arxiv created 2020/01/22 · arxiv updated 2020/02/06
In this work, we present the mass spectrum of higher charomona around and above 4.6 GeV by adopting the unquenched potential model. We perform a combined fit to the updated experimental data of e+e- → ψ(2S)π+π- and e+e-→ ΛcΛc. To understand the "platform" structure observed in the range of 4.57 ∼ 4.60 GeV existing in the ΛcΛc invariant mass spectrum of e+e-→ ΛcΛc of BESIII, we introduce two resonances in this combined fit to the e+e- → ψ(2S)π+π- and e+e-→ ΛcΛc, which have resonance parameters, mY1=4585±2 MeV, ΓY1=29.8±8.0 MeV, mY2=4676±7 MeV, and ΓY2=85.7±15.0 MeV. Furthermore, combining with our theoretical results, we indicate that the two charmonium-like Y states can be due to two higher charmonia, which are mixtures of 6S and 5D cc states. Their two-body open-charm decay behaviors are given. Under the same framework, our analysis of the data of e+e-→ Ds+Ds1(2536)- recently released by Belle supports to introduce these two higher charmonia around 4.6 GeV. Additionally, we predict the masses and two-body open-charm decays of six higher charmonia ψ(nS) and ψ(mD) with n=7,8,9 and m=6,7,8 above 4.6 GeV. Search for these higher charmonia will be an interesting issue for the running BESIII and BelleII, and even the possible Super Tau-Charm Factory discussed in China.