A careful re-analysis is made on e + e − → X(4660) → (Λ cΛc )/(ψ ππ) processes, aiming at resolving the apparent conflicts between Belle and BESIII data above Λ cΛc threshold. We use a model containing a Breit-Wigner resonance and Λ cΛc four-point contact interactions, with which the enhancement right above Λ cΛc threshold is well explained by a virtual pole generated by Λ cΛc attractive final state interaction, located at M V = 4.566 ± 0.007 GeV. Meanwhile, X(4660) remains to be a typical Breit-Wigner resonance, and is hence of confinement nature. Our analysis strongly suggests the existence of the virtual pole with statistical significance of 4.2 standard deviation (σ). Nevertheless, the conclusion crucially depends on the line-shape of cross sections which are of limited statistics, hence we urge new experimental analyses from Belle II, BESIII, and LHCb to settle down the issue.

The analysis of the LHCb data on X(6900) found in the di-J/ψ system is performed using a momentum-dependent Flattè-like parameterization. The use of the pole counting rule and spectral density function sum rule give consistent conclusions that both confining states and molecular states are possible, or it is unable to distinguish the nature of X(6900), if only the di-J/ψ experimental data with current statistics are available. We suggest that experiments measure other channels, such as J/ψψ(3770), J/ψψ2(3823), J/ψψ3(3842), and χc0χc1, to better understand the nature of X(6900), and J/ψψ(4160), χc0χc1(3872), etc., to confirm the X(7200) state.

Pectic polysaccharides extracted from Rauvolfia verticillata (Lour.)Baill.var. hainanensis Tsiang exerts beneficial effects in experimental colitis and may therefore provide a useful therapeutic approach for the treatment of UC.

New measurements on cross sections in $$e^+e^-\rightarrow J/\psi \pi ^+\pi ^-$$ e + e - → J / ψ π + π - , $$h_c\pi ^+\pi ^-$$ h c π + π - , $$D^0D^{*-}\pi ^++c.c.$$ D 0 D ∗ - π + + c . c . , $$\psi (2S)\pi ^+\pi ^-$$ ψ ( 2 S ) π + π - , $$\omega \chi _{c0}$$ ω χ c 0 and $$J/\psi \eta $$ J / ψ η channels have been carried out by BESIII, Belle and BABAR experiments, as well as in the $$D_s^{*+}D_s^{*-}$$ D s ∗ + D s ∗ - channel. We perform extensive numerical analyses by combining all these data available, together with those in $$D^+D^{*-}+c.c.$$ D + D ∗ - + c . c . and $$D^{*+}D^{*-}$$ D ∗ + D ∗ - channels. Though the latter show no evident peak around $$\sqrt{s}=4.230$$ s = 4.230 GeV, the missing X(4260) is explained as that it is concealed by the interference effects of the well established charmonia $$\psi (4040)$$ ψ ( 4040 ) , $$\psi (4160)$$ ψ ( 4160 ) and $$\psi (4415)$$ ψ ( 4415 ) . Our analyses reveal that the leptonic decay width of X(4260) ranges from $$\mathcal {O}(10^2)$$ O ( 10 2 ) eV to $$\mathcal {O}(1)$$ O ( 1 ) keV, and hence it is probably explained in the conventional quark model picture. That is, the X(4260) may well be interpreted as a mixture of $$4^3S_1$$ 4 3 S 1 and $$3^3D_1$$ 3 3 D 1 ($$2^3D_1$$ 2 3 D 1 ) states.