Preprint
Oct 2026
Born-Oppenheimer chiral effective field theory and its application to $X_b$
Following the discovery of the exotic state $X(3872)$ in the charmonium spectrum, the possible existence of an analogous state, $X_b$, in the bottomonium sector has attracted considerable attention of the hadronic physics community. In this work, we lay the ground for the development of Born-Oppenheimer chiral effectiv...
Yu Zhang, Feng-Kun Guo, C. Hanhart et al.
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