X 0(2900) and its heavy quark spin partners in molecular picture *

Abstract

Abstract The , recently observed by the LHCb Collaboration in the invariant mass of the process, is the first exotic candidate with four different flavors, beginning a new era for the hadron community. Under the assumption that the is a hadronic molecule, we extracted the whole heavy-quark symmetry multiplet formed by the doublet and the meson. For the bound state case, there would be two additional hadronic molecules associated with the and channels, as well as one additional molecule. In the light quark limit, they are and below the and thresholds, respectively, which are unambiguously fixed by the mass position of the . For the virtual state case, there would be one additional hadronic molecule, strongly coupled to the channel, and one additional molecule. Searching for these heavy quark spin partners will help shed light on the nature of the .