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物理学
X_0(2900) and its heavy quark spin partners in molecular picture
The X_0(2900),recently observed by the LHCb Collaboration in the D~~K~+ invariant mass of the B~+→D~+D~-K~+ process,is the first exotic candidate with four different flavors,beginning a new era for the hadron community.Under the assumption that the X_0(2900) is a I(J~P)=0(0~+) D~*K~* hadronic molecule,we extracted the whole heavy-quark symmetry multiplet formed by the(D,D~*) doublet and the K~* meson.For the bound state case,there would be two additional I(J~P)=0(1~+) hadronic molecules associated with the DK~* and D~*K~* channels,as well as one additional 1(J~P)=0(2~+) D~*K~* molecule.In the light quark limit,they are 36.66 MeV and 34.22 MeV below the DK~* and D~*K~* thresholds,respectively,which are unambiguously fixed by the mass position of the X_0(2900).For the virtual state case,there would be one additional I(J~P)=0(1~+) hadronic molecule,strongly coupled to the DK~* channel,and one additional I(J~P)=0(2~+) D~*K~* molecule.Searching for these heavy quark spin partners will help shed light on the nature of the X_0(2900).
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Chinese Physics C
2021年02期
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