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Ji, T., Dong, X. K., Albaladejo, M., Du, M. L., Guo, F. K., Nieves, J., et al. (2023). Understanding the 0(++) and 2(++) charmonium(-like) states near 3.9 GeV. Sci. Bull., 68(7), 688–697.
Abstract: We propose that the X(3915) observed in the J/psi x channel is the same state as the chi(c2)(3930), and the X(3960), observed in the Ds+Ds- channel, is an S-wave Ds+Ds- hadronic molecule. In addition, the J(PC) = 0(++) component in the B+ -> D+D-K+ assigned to the X(3915) in the current Review of Particle Physics has the same origin as the X(3960), which has a mass around 3.94 GeV. To check the proposal, the available data in the D (D) over bar and Ds+Ds- channels from both B decays and gamma gamma fusion reaction are analyzed considering both the D (D) over bar -D-s(D) over bar (s)-D*(D) over bar*-D-s*(D) over bar (s)* coupled channels with 0(++) and a 2(++) state introduced additionally. It is found that all the data in different processes can be simultaneously well reproduced, and the coupled-channel dynamics produce four hidden-charm scalar molecular states with masses around 3.73, 3.94, 3.99 and 4.23 GeV, respectively. The results may deepen our understanding of the spectrum of charmonia as well as of the interactions between charmed hadrons.
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Sanchez-Illana, J., Molina, R., & Shi, P. P. (2026). The B(∗)K(∗)-coupled-channel system in the hidden-gauge approach. Phys. Lett. B, 881, 140888–7pp.
Abstract: In this work we provide predictions for bottom-strange molecular states within the Hidden Gauge Formalism. We study the coupled-channel scattering of B(& lowast;) K(& lowast;) states and, by fixing only one free parameter to obtain the mass of a new excited Bs0 state seen by the LHCb, we predict the pole parameters of six states in this sector. Concretely, we get that the masses of the flavor partners of the Ds0(2317) and Ds1(2460) states in the bottom sector are 5760 and 5802 MeV for the BK (JP = 0+) and B & lowast; K (1+) states, respectively. Moreover, the recently seen states by the LHCb with masses around 6100 and 6160 MeV can be interpreted as BK & lowast; and B & lowast; K & lowast; molecular states, according to reasonable values of the pole parameters and the splitting between these two states obtained in our calculation.
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