Abstract
We studied the DD¯⁎/D¯D⁎, D⁎D¯⁎, D¯sD⁎/D¯s⁎D, BB¯⁎/B¯B⁎ and B⁎B¯⁎ di-hadron interactions in chiral effective field theory (χEFT) up to the next-to-leading (NLO) order. The above-threshold tetraquark states Zc(3900), Zc(4020), Zcs(3985), Zb(10610), Zb(10650) can be explained as the corresponding di-hadron resonances, respectively. We also studied the Σc(⁎)D¯(⁎) interactions to investigate the three hidden-charm pentaquarks Pc(4312), Pc(4440) and Pc(4457). We further used the parameters fixed from the Pc states to predict the possible molecular states in ΞcD¯(⁎), Ξc′D¯(⁎) and Ξc⁎D¯(⁎) systems. Our predictions of the ΞcD¯(⁎) bound states are very consistent with two new near-threshold structures recently observed by the LHCb Collaboration.
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