2021/08/31 by Xiang-Kun Dong, Feng-Kun Guo, Bing-Song Zou · 4 citations
Physics and Astronomy · #hep-ph #hep-ex #hep-lat
paper · pdf · doi:10.1088/1572-9494/ac27a2
published as Commun. Theor. Phys. 73 (2021) 125201 · v3: the published version, mistakes about the quantum numbers of identical di-baryon system corrected and 122 double-charm hadronic molecules; v2: more discussion added and references updated; v1: 20 pages, 6 figures and 124 double-charm hadronic molecules including the recently discovered T_{cc} in LHCb measurement
arxiv created 2021/10/28 · arxiv updated 2021/10/29
The spectrum of hadronic molecules composed of heavy-antiheavy charmed hadrons has been obtained in our previous work. The potentials are constants at the leading order, which are estimated from resonance saturation. The experimental candidates of hadronic molecules, say X(3872), Y(4260), three Pc states and Pcs(4459), fit the spectrum well. The success in describing the pattern of heavy-antiheavy hadronic molecules stimulates us to give more predictions for the heavy-heavy cases, which are less discussed in literature than the heavy-antiheavy ones. Given that the heavy-antiheavy hadronic molecules, several of which have strong experimental evidence, emerge from the dominant constant interaction from resonance saturation, we find that the existence of many heavy-heavy hadronic molecules is natural. Among these predicted heavy-heavy states we highlight the DD^* molecule and the D(*)Σc(*) molecules, which are the partners of the famous X(3872) and Pc states. Quite recently, LHCb collaboration reported a doubly charmed tetraquark state, Tcc, which is in line with our results for the DD^* molecule. With the first experimental signal of this new kind of exotic states, the upcoming 3pdate of the LHCb experiment as well as other experiments will provide more chances of observing the heavy-heavy hadronic molecules.