Taking into account that the scalar $$a_0(980)$$ a 0 ( 980 ) can be dynamically generated from the pseudoscalar-pseudoscalar interaction within the chiral unitary approach, we have studied the single Cabibbo suppressed process $$D^+\rightarrow \pi ^+\pi ^0\eta $$ D + → π + π 0 η . We find clear peaks of $$a_0(980)^+$$ a 0 ( 980 ) + and $$a_0(980)^0$$ a 0 ( 980 ) 0 in the $$\pi ^+\eta $$ π + η and $$\pi ^0\eta $$ π 0 η invariant mass distributions, respectively. The predicted Dalitz plots of $$D^+\rightarrow \pi ^+\pi ^0\eta $$ D + → π + π 0 η also manifest the significant signals for $$a_0(980)^+$$ a 0 ( 980 ) + and $$a_0(980)^0$$ a 0 ( 980 ) 0 states. The uncertainties of the results due to the free parameters are also discussed. Our study shows that the process $$D^+\rightarrow \pi ^+\pi ^0\eta $$ D + → π + π 0 η can be used to explore the nature of the scalar $$a_0(980)$$ a 0 ( 980 ) , thus we encourage the experimental physicists to measure this reaction with more precision.
Within the framework of the local hidden gauge approach, we have studied the near-threshold $$D^* {\bar{D}}^*$$ D ∗ D ¯ ∗ interaction with quantum numbers $$I(J^{PC}) = 0(0^{++})$$ I ( J PC ) = 0 ( 0 + + ) , $$0(2^{++})$$ 0 ( 2 + + ) , $$1(0^{++})$$ 1 ( 0 + + ) , and $$1(2^{++})$$ 1 ( 2 + + ) , respectively. The contact term and vector meson exchange term in coupled channels are taken into account in this work. One pole, which is found in the case of the quantum numbers $$I(J^{PC}) = 0(0^{++})$$ I ( J PC ) = 0 ( 0 + + ) , could be associated to the X(4014) recently observed by the Belle Collaboration. Thus, we suggest that the X(4014) may be an $$D^* {\bar{D}}^*$$ D ∗ D ¯ ∗ molecular state with $$I(J^{PC}) = 0(0^{++})$$ I ( J PC ) = 0 ( 0 + + ) , and more precise information about X(4014), such as resonance parameters and decay properties, could be useful to shed light on its structure.
We have analyzed the reaction χ c0 →pK þ Λ reported by the BESIII Collaboration, taking into account the contributions from the intermediate Kð1830Þ, Nð2300Þ, and Λð1520Þ resonances. Our results are in good agreement with the BESIII measurements, and it is found that the anomalous enhancement near thē pΛ threshold is mainly due to the contribution of the Kð1830Þ resonance. We also show that the interference of the high-mass N Ã and Λ Ã can not produce the anomalous enhancement near thepΛ threshold.
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