Molecular charmed baryons and pentaquarks from light-meson exchange saturation
Mao-Jun Yan (CAS Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190, China); Fang-Zheng Peng (School of Physics, Beihang University, Beijing 100191, China); Manuel Pavon Valderrama (School of Physics, Beihang University, Beijing 100191, China)
The spectrum of the baryons contains a few states whose nature is not clearly a three-quark composite and which might have a sizable baryon-meson component. Examples include the or the . Here we explore the spectrum of two-body systems composed of a light, octet baryon and a charmed meson (or antimeson) within a simple contact-range theory in which the couplings are saturated by light-meson exchanges. This results in the prediction of a series of composite anticharmed pentaquarks () and singly charmed baryons (). Among the latter we find and bound states with masses matching those of the recently observed and baryons.